bai giang mastercamgood

7/31/2019 Bai Giang MasterCAMGood

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MC LC.

MC LC. 1

Chng 1: TNG QUAN V MASTERCAM. 6

1.1. Gii thiu chung. 6

1.2. Khi ng MasterCAM. 6

1.3. Giao din mn hnh lm vic MasterCAM. 6

1.4. Cc khi nim & thut ng trong MasterCAM. 7

1.4.1. Ca s ha (Graphic Widnow). 8

1.4.2. Thanh trng thi (Status Bar). 99

1.4.3. Th qun l ng chy dao & vt th 3D (Toolpath & Solid Management Tab). 10

1.4.4. Thanh cng c (Toolbar). 10

1.4.5. Cc gi tng tc (Interactive Prompts). 11

1.4.6. Hp thoi (Dialog Boxes). 11

1.4.7. Thanh cng c Ribbon (Ribbon Bar). 12

Thanh Ribbon c chc nng tng t hp thoi nhng giao din ca n li ging nh mt thanh

cng c. 12

1.4.7.1. iu hng thanh Ribbon. 13

C 3 cch di chuyn qua li gia cc trng & cc nt lnh trong thanh Ribbon. Ngi dng

c th: 13

1.4.7.2.Kha & m kha cc trng. 131.4.8. Ch hc (Learning Mode). 14

1.4.9. Thanh cng c v phc (Sketcher). 15

1.4.10. Thanh thc n nhy chut phi (Right-Click Menus). 15

1.4.11. Cc phm g tt (Shortcut Keys). 16

Bi ging MasterCAM 1


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1.4.12. Qun l vic thit lp nh ngha my & iu khin (Machine Definition/ Control

Definition Managers). 18

1.4.13. ng chy dao. 18

Chng 2: THIT K TRONG MASTERCAM. 19

2.1. C s v & thit k. 19

2.1.1. S dng thanh thc n AutoCursor Ribbon (Using the AutoCurrsor Ribbon Bar). 20

2.1.1.1. Cc du hiu nhn bit kiu bt im (Visual Cues). 20

21

2.1.1.2. Nhp gi tr ta cc im. 21

2.1.1.3. S dng ch Fastpoint nhp ta im. 22

2.1.1.4. Ty chnh cc la chn bt im. 23

2.1.1.5. S dng AutoCursor Override. 24

2.1.2. La chn cc i tng. 24

2.1.2.1. S dng thanh cng c General Selection Ribbon. 24

2.1.3. Xu chui. 26

2.1.3.1. Xu chui cc i tng hnh hc khung dy. 26

2.1.3.1. Xu chui cc i tng hnh hc khi c. 29

2.1.4. Thit lp cc thuc tnh. 29

2.1.4. Thit lp cc thuc tnh cho cc i tng mi. 30

2.1.4.2. Thay i cc thuc tnh ca i tng. 32

2.1.5. Thit lp chiu su Z. 34

2.1.6. Lm vic trong ch 2D & 3D. 34

2.1.7. Thit lp mt phng, khung nhn & h ta lm vic (WCS Work Coodinate System).

35

2.1.7.1. Hng quan st, mt phng & h ta . 35

2.1.7.2. Cc khung nhn tiu chun. 36

Bi ging MasterCAM 2


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2.1.7.3. S dng cc la chn trong thc n Gview/ Planes/ WCS ca thanh trng thi. 39

2.1.7.4. S dng WCS & Tplanes thit lp ng chy dao. 42

2.1.7.4.1. Hng dn chung. 42

2.1.4.7.2. Dch chuyn h ta theo chi tit. 42

2.1.4.7.3. Gia cng 2 chi tit trn 2 g khc nhau. 43

2.1.7.5. H ta my tin. 44

2.1.7.5.1. nh ngha loi dao & my tin. 44

2.1.7.5.2. Quay h ta dng c my tin. 45

2.1.7.5.3. Mt phng dng hnh ca my tin (Lathe Cplane) 45

2.2. Xy dng hnh hc 2D. 46

MasterCAM qun l cc lnh xy dng cc i tng hnh hc trong thanh thc n Creat

(Hnh 2.27). phn di y ta s ln lt khai thc cc cng c trn thanh thc n ny. 46

2.2.1. S dng thanh cng c SKETCHER. 46

Thao tc v cc i tng hnh hc 2D & 3D c bn trong MasterCAM rt linh hot, thn thin.

n gin ch cn la chn chc nng v phc t danh sch th xung, kch chut vo khu vc ca

s ha & v i tng cn thit lp. Ngoi ra, ta cng c th s dng chc nng ca thanh

Ribbon hay cc la chn trong hp thoi nh ngha & hiu chnh cc thng s ca i tng

hnh hc. 47

2.2.2. V im (Points). 47

2.2.2.1. Creat Point Position: 47

2.2.2.2. Creat Point Dynamic: 48

2.2.2.3. Creat Point Node Points: 48

2.2.2.4. Creat Point Segment: 49

2.2.2.5. Creat Point Endpoints: 50

2.2.2.6. Creat Point Small Arcs: 50

2.2.3. V on thng (Lines). 51

2.2.3.2. Creat Line Closest: 52

Bi ging MasterCAM 3


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2.2.3.3. Creat Line Bisect: 53

2.2.3.4. Creat Line Perpendicular: 53

2.2.3.5. Creat Line Parallel: 55

2.2.4. V ng trn & cung trn (Arcs & Circles). 55

2.2.4.1. Creat Circle Center Point. 56

2.2.4.2. Creat Arc Polar. 57

2.2.4.3. Creat Circle Edge Point. 58

2.2.4.4. Creat Arc Endpoint. 59

2.2.4.5. Creat Arc 3 Point. 60

2.2.4.6. Creat Arc Polar Endpoint. 60

2.2.4.6. Creat ArcTangent. 61

2.2.5. V cc i tng hnh hc hnh dng hn hp (Miscellaneous Shapes). 63

2.2.5.1. Creat Rectangle (V hnh ch nht). 64

2.2.5.2. Creat Rectangular Shape (V hnh c dng hnh ch nht). 65

2.2.5.3. Creat Polygon (V hnh a gic u). 68

2.2.5.4. Creat Ellipse. 69

2.2.5.5. Creat Bounding Box (Xy dng hp ng bao). 71

2.2.5.6. Creat letters. 74

2.2.5.7. Creat Spiral. 75

2.2.5.8. Creat Helix. 77

2.2.6. V cung ln & cnh vt (Fillets & Chamfers). 79

2.2.6.1. Fillet Entities. 79

2.2.6.2. Fillet Chains. 81

2.2.6.3. Chamfer Entities. 84

2.2.6.2. Chamfer Chains. 86

Bi ging MasterCAM 4


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2.2.7. V ng cong tham s SPLINE. 89

2.2.7.1. Creat Manual Spline. 90

2.2.7.2. Creat Automatic Spline. 91

2.2.7.3. Creat Curve Spline. 92

2.2.7.4. Creat Bended Spline. 95

2.3. Bin i hnh hc. 96

2.3.1. Hiu chnh i tng. 97

2.3.1.1. Trim/Break/Extend. 97

Chng 3: GIA CNG C KH. 101

3.1. Tng quan v qu trnh gia cng c kh. 102

3.2. La chn & xc lp cc thng s cho my CNC. 102

3.3. Thit lp cc thuc tnh cho nhm my gia cng. 105

3.3.1. Lm vic vi Toolpath Manager. 105

3.3.2. S dng Insert Arrow. 106

3.3.3. Thit lp cc nhm my & nhm ng chy dao. 106

3.3.4. Thit lp cc thuc tnh nhm my. 106

Bi ging MasterCAM 5


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Chng 1: TNG QUAN V MASTERCAM.

1.1. Gii thiu chung.

MasterCAM l phn mm tin hc ng dng CAD/CAM s dng thit k & gia cng m

phng cc chi tit c kh trn my CNC.

1.2. Khi ng MasterCAM.

C 2 cch khi ng mt chng trnh MasterCAM X trong mi trng Window

9x v NT, XP:

Cch 1: Nu bn to mt biu tng - shortcut trn mn hnh, Double Click

vo .

Cch 2: Trn thanh taskbar, Click vo nt Start\All Programs\MasterCAM X\MasterCAM X.

Sau khi khi ng xong, mn hnh ha s c giao din nh hnh 1.2.

Hnh 1.2. Giao din chng trnh MasterCAM sau khi khi ng.

1.3. Giao din mn hnh lm vic MasterCAM.

Sau khi vo MasterCAM, h thng s hin th mn hnh lm vic ca MasterCAM vi 4 phn

vng chnh sau:

Bi ging MasterCAM 6

Hnh 1.1.

Vng ha


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Vng mn hnh ho (Graphic Area): y l vng lm vic, ni cc m hnh hnh hc s

ca i tng c thit lp hoc c gi ra v chnh sa.

Vng thanh cng c (Toolbar): Thanh cng c l mt hng cc nt nm ngang pha trn cng

ca mn hnh. Mi nt ny c mt icon hoc con s nhn bit. Ngoi ra nu cn mt m t r hn

v mt nt no , ch cn di tr chut n nt , bn s c cung cp mt menu xng m t r

hn v nt . Mun thc hin lnh tng ng vi nt no (Icon Command), ch cn click vo nt

l yu cu c thc hin.

Vng thc n (Menu): Vng Menu nm bn trn ca mn hnh, cha menu bar. Menu bar

c s dng chn cc chc nng ca MasterCAM, v d : Creat, modify, toolpaths... Cn menu

ph nm pha di ca mn hnh c s dng thay i cc thng s h thng ca chng trnh,

v d: su Z, mu sc l nhng chc nng thng xuyn c ngi s dung thay i. Tt c cc

lnh dng trong MasterCAM u c th chn t vng Menu .

Vng hi p ca chng trnh (System response area): Ti y, mt hoc hai dng vn bn

di cng ca mn hnh s m t hot ng ca cc lnh. y l ni bn nhn c cc li nhc ca

chng trnh. Phi quan st vng ny cn thn, c th n s yu cu bn phi nhp cc thng s t bn

phm.

1.4. Cc khi nim & thut ng trong MasterCAM.

Trong phn ny, ngi dng s nm c bn cc thut ng trn hnh 1.3 cng nh cc khi nim

& c im ca MasterCAM, bao gm:

Ca s ha (Graphic Widnow).

Thanh trng thi (Status Bar).

Th qun l ng chy dao & vt th 3D (Toolpath & Solid Management Tab).

Thanh cng c (Toolbar).

...

Gi (Tool Tips).

Hp thoi (Dialog Boxes).

Thanh Ribbon (Ribbon Bar).

Ch hc (Learning Mode).

Thanh cng c v phc (Sketcher).

...

Bi ging MasterCAM 7


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Hnh 1.3. Tng quan giao din lm vic ca MasterCAM.

1.4.1. Ca s ha (Graphic Widnow).

y l khng gian lm vic chnh trong MasterCAM khi ngi dng quan st, thit lp, thay i

cc i tng hnh hc & ng dng c.

Bi ging MasterCAM 8


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Hnh 1.4. Ca s ha MasterCAM.

1.4.2. Thanh trng thi (Status Bar).

Hnh 1.5. Thanh trng thi MasterCAM.

STTThnh phn ca

menu phM t

1. Hin th v thay i su lm vic hin ti.

2.Thay i mu sc lin kt ti cc i tng hay chc nng c

la chn.

3. t level lm vic.

4.t thuc tnh cho dy ca nt v v kiu nt v layer lm

vic, v dng hin th ca im, mu ca i tng.

5. t mt phng ban u cho qu trnh dng hnh.

6.Thit lp, thay i, xa, quan st, thc thi chc nng, thit lp cc

thuc tnh cho nhm i tng c la chn

Bi ging MasterCAM 9


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7.Ty chnh th t sp xp, tt i hay bt ln cc trng trn thanh

trng thi.

8.

Thay i hng nhn trn mn hnh ho. Ch rng, hng

nhn ca mn hnh ho c th khng ph thuc vo mt phng

dng hnh.

1.4.3. Th qun l ng chy dao & vt th 3D (Toolpath & Solid Management

Tab).

Th qun l ng chy dao & vt th 3D xut hin

trong khung Qun l hot ng, vng bn tri mn hnh

ha.

Ngi dng c th lm n hay hin khung Qun l

hot ng bng cch la chn chc nng:

Khi khung ny n i, ca s ha s dn rng & c

chiu rng trng kht vi chiu rng ca mn hnh ha

MasterCAM.

Th Qun l ng chy dao (Toolpath) l ni

ngi dng nh ngha cc thng s ci t nh cc h s mc nh, cc thit lp cho dng c, khai

bo kch thc phi & vng lm vic an ton. Ngi dng cng c th s dng th quan st, tchc & hiu chnh cc nhm my, cc nhm ng chy dao & cc hot ng.

Th Qun l vt th 3D (Solid): nu MasterCAM Solid c ci t, khi ngi dng lm vic

vi mt mu vt th 3D, th s ghi vo danh sch mi khi vt th trong h s hin hnh. Ngi dng

c th x cy qun l vt th quan st cc thnh phn & c tnh hnh thnh nn vt th & ng

chy dao ca n.

1.4.4. Thanh cng c (Toolbar).

Thanh cng c l tp hp cc chc nng c m t bng cc biu tng. Trong thanh cng ccha ng t cc thanh cng c con to mi, m, lu tr, in n h s, hiu chnh hng quan st,

mt phng lm vic ti cc cng c dng thit kt cc khi hnh hc 2D & 3D, cc la chn my &

ng chy dao gia cng,...

Bi ging MasterCAM 10

Hnh 1.6. Th qun l ng dng

c & vt th 3D.


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Hnh 1.7. Thanh cng c.

hin th hay tt cc thanh cng c trn mn hnh ha, di

chuyn con tr chut ti khu vc thanh cng c, nhy phi & thc hin

cc thao tc la chn mong mun (hnh 1.8).

Phn cc thanh cng c s c tm hiu su v sau.

1.4.5. Cc gi tng tc (Interactive Prompts).

Khi ngi dng di chuyn chut ti mt nt lnh bt k thc

hin thao tc cng nh trong qu trnh thc hin lnh, mt dng nhc s

xut hin di dng hp thoi text trong ca s ha hng dn

ngi dng nhn bit tc dng ca nt lnh cng nhwg trnh t thc hin

lnh.V d: khi di chuyn chut ti nt lnh v ng thng ta s thy

dng gi :

Hay khi ta v ng trn:

1.4.6. Hp thoi (Dialog Boxes).

Hp thoi xut hin khi ngi dng c yu cu nhp vo cc thng tin hon thin chc

nng c la chn. Nhiu hp thoi cn cho php ngi dng tng tc vi ca s ha. V d:

ngi dng c th nhp cc gi tr vo cc trng trong hp thoi bng cch la chn mt v tr, i

tng hay ng chy dao trn ca s ha.

Hnh 1.9 l mt v d v hp thoi. Mc nh ca hp thoi l mt s trng cn thit lp. Ngidng c th x hp thoi ra bng cch kch vo nt lnh hay rt ngn hp thoi li bng cch kch

vo nt lnh .


Hnh 1.8.


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1.4.7. Thanh cng c Ribbon (Ribbon Bar).

Thanh Ribbon c chc nng tng t hp thoi nhng giao din ca n li ging nh mt thanh

cng c.

Khi cha thc hin cc chc nng lnh, thanh Ribbon ch l 1 di xm (Hnh 1.10):


Hnh 1.9.


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Hinh 1.10: Thanh Ribbon khi cha kch hot lnh.

Cn khi ta thc hin thao tc vi 1 lnh no , thanh ribon s xut hin trn n cc chc nng &

thng s phc v cho qu trnh thc hin lnh. V d: v ng trn.

Hnh 1.11. Thanh Ribbon khi kch hot lnh v ng trn.

1.4.7.1. iu hng thanh Ribbon.

C 3 cch di chuyn qua li gia cc trng & cc nt lnh trong thanh Ribbon. Ngi dng

c th:

Ngi dng c th kch con tr chut tri vo cc nt lnh cng nh t con tr vo v

hp thoi cha cc trng tham s.

S dng phm Tab di chuyn qua li gia cc trng.

Nhn vo phm tt c lin kt vi nt lnh hay trng kch hot nt lnh hay trng

. V d: nhn phm T kch hot nt lnh Tangent khi v ng trn.

1.4.7.2.Kha & m kha cc trng.

D liu trong cc trng trn thanh Ribbon c th c ng bng (kha) ngn cn vic thay

i gi tr va thit lp khii ngi dng thay i li v tr con tr chut trn mn hnh ha. Mi

trng u c 3 trng thi:

Unlocked: y l trng thi bnh thng mc nh ca 1 thanh Ribbon hay

trng hp thoi. Trng thi ny cho php thay i gi tr theo s thay i ca v tr con tr trn ca s

ha.

Soft-Locked: Khi trng thi Soft-Locked (kha mm), d liu ch b ng

bng trong qu trnh xy dng i tng hin ti. Khi chuyn sang xy dng i tng tip theo,

trng lm vic s tr v trng thi Unlocked (mc nh). kha mm 1 trng, n gin ch cn

nhp 1 gi tr vo hp thoi ca trng & n phm Enter. Khi , nt lnh bn tri trng s bchm xung, bo hiu trng thi b kha mm

Hard-Locked: trng thi Hard-Locked (khoa cng), d liu s lin tc b

ng bng ch ti khi ngi dng m kha trng cha d liu bng tay. Trng thi ny c s dng

khi cn xy dng 1 chui cc i tng c trng tham s no ging nhau. kha cng 1 trng,

ngi dng phi nhp gi tr tham s vo hp thoi trn trng, sau kch vo nt lnh bn tri



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trng d liu hoc nhn t hp phm Shift + kch chut. Khi hp thoi s chuyn sang mu

biu th trng thi b kha. m kha trng d liu , ngi dng ch cn kch vo nt lnh bn

tri trng .

1.4.8. Ch hc (Learning Mode).

Ch hc trong thanh Ribbon cung cp cho ngi dng cc thng tin v cc phm tt tngng vi cc lnh ca n. Khi ch hc c kch hot, mt chui nhng gi v phm tt s hin th

di thanh Ribbon khi ngi dng t con tr chut vo bt k vng no trn thanh Ribbon hay

trng lnh ang thc hin.

Hnh 1.12. V d v ch hc.

bt (hay tt) ch hc, ta vo menu Settings/Configuration (hnh 1.13). Trong hp thoi System Configuration,

chn trang Screen, la chn (b la chn) trong Option

(hnh 1.14).

Hnh 1.14.Hp thoi System Configuration.


Hnh 1.13.


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1.4.9. Thanh cng c v phc (Sketcher).

Trong MasterCAM, thanh cng c v phc c chc nng xy dng cc i tng hnh hc c s.

Phng thc xy dng cc i tng rt nhanh chng & linh hot, bng cch di chuyn chut & kch

chut tri ln mn hnh ha cng vi nhp thng s qua bn phm. y, cc i tng hnh hc

c s bao gm cc im, on thng, ng cong, ng spline, bo trn, vt gc,... & khng bao gm

cc cng c v hnh ha (Drafting), bin i tuyn tnh (Transform), hiu chnh (Modify), xy dng b

mt (Surfaces) & cc khi 3D (Solids).

Hnh 1.15. Thanh Sketcher.

v cc i tng hnh hc c s, kch vo cc lnh chnh trn thanh Sketcher ta s thy mt

chui danh sch x xung, chn lnh cn thc hin t thc n, di chuyn chut thc hin v trn ca

s ha, thay i cc thng s trong thanh Ribbon & kt thc thao tc v i tng.

1.4.10. Thanh thc n nhy chut phi (Right-Click Menus).MasterCAM cung cp cho ngi dng mt s cc thanh thc n khi nhy chut phi. V d

trong th Toolpath Manager, khi kch chut phi ta s thy mt thc n chc nng x ra c cha cc

thc n con la chn cc nhm my, kiu gia cng, kiu ng chy dao, ... (hnh 1.16).

Di y l mt s thanh thc n c th xut hin khi ta nhy chut phi vo ni (hay tc v)

no trn mn hnh ha MasterCAM:

Lever Manager.

Th Toolpath Manager.

Th Toolpath Parameters.

Tool Manager.

Drill Point Manager

(Mill/Router).

Post Text Page.

Chain Manager.

View Manager.

Th Solid Manager.

Machine Definition Manager.

Material List.



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Th Toolpath Manager (Lathe). Th Toolpath Manager

(Mill/Router).

Hnh 1.16. Thanh thc n t nhy chut phi trong th Toolpath Manager.

1.4.11. Cc phm g tt (Shortcut Keys).

Khi thc hin mt lnh, thay v kch vo cc biu tng truy nhp vo thanh Ribbon & la

chn trong cc hp thoi, MasterCAM cung cp cho ngi dng cc phm c bit c gn sn truy nhp vo lnh , l ccphm tt.



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Hnh 1.17.

V d: khi v ng cong (arc) i qua 3 im, ta c th dng phm tt (hnh 1.17):

T thay cho kch vo lnh to ng cong tip xc vi ng thng.

O thot khi lnh v ng cong i qua 3 im.

Ngi dng c th quan st cc phm tt khi thc hin lnh bng cch hin th ch hc trong

thanh Ribbon.

Ngoi ra ngi dng cng c th s dng cc phm tt khc khi lm vic vi cc thanh thc ntrong MasterCAM, l cc phm F1 F12, cc t hp phm gia Ctrl, Alt, Shift vi cc k t

Alphabet & k t s trn bn phm. V d: thanh thc n Edit & thanh thc n View.

Hnh 1.18.



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1.4.12. Qun l vic thit lp nh ngha my & iu khin (Machine Definition/

Control Definition Managers).

Trong b ci MasterCAM cha ng rt nhiu cc nh ngha my, nh ngha iu khin mc

nh & cc chng trnh x l cui cng (Post Processors). Cc chc nng trong Qun l vic thit lp

nh ngha my & iu khin ly t thanh thc n Machine Type dng ty chnh hay thit lpmt nh ngha my theo yu cu ca ngi dng ph hp vi chi tit cn gia cng trong h s hin

hnh trong chng trnh x l ca MasterCAM.

Mt nh ngha my m t:

Cc thnh phn ca my cng c & mi quan h qua li gia chng.

Mt nh ngha iu khin cung cp cho chng trnh x l cui cc thng tin cn thit

thit lp cc ng dng cuj ph hp vi cc yu cu iu khin.

Chng trnh x l cui thch hp vi loi my & s t hp iu khin c th.

1.4.13. ng chy dao.

Trong MasterCAM, ng chy dao m t d liu v dng c & cc chuyn ng gia cng

ct gt phn vt liu cn thit t phi gc hnh thnh nn chi tit. ng chy dao cha ng mt

tp hp theo quy lut nh ngha cc kiu chui & thng s ch php, cng nh cch ng dng cc

yu t vo qu trnh iu hnh mt hot ng thit k & gia cng. Mi hot ng u phi tun

theo nhng quy lut ring ca mi loi ng chy dao c th. Mi ng chy dao c xy dng

u c hin th l mt phn hot ng trong mt nhm my c thit lp trc . Ngi dng c

th quan st cng nh hiu chnh cc cng c trong th Toolpath Manager.

thit lp mt ng chy dao, ngi dng phi la chn kiu my ...(42/410).



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Chng 2: THIT K TRONG MASTERCAM.

Chng ny s tp trung gii thiu cc khi nim, chc nng & cc k thut m ngi dng c

th xy dng & hiu chnh cc i tng hnh hc.

2.1. C s v & thit k.

MasterCAM cung cp cho ngi dng cc cng c v thn thin, t do & linh hot cng nh

gip ngi dng t c chnh xc thit k cn thit. Trong mi trng v MasterCAM th chut

& con tr chut l nhng cng c thit k k thut, cn cc chc nng trong thanh thc n Creat l

cc cng c c bn h tr qu trnh thit k. Mastercam Design cng cung cp nhiu chc nng v

CAD khc gip cho cng vic ca ngi thit k tr nn d dng hn.

Vi Mastercam Design, ngi dng c th xy dng cc i tng dng khung dy, b mt, cc

dng hnh hc khi thy & hnh hc b mt. Nu trong b ci c tch hp Mastercam Solid, ngi

dng cn c cung cp cc cng c m rng to dng cc khi hnh hc c 3D.

Phn u ny s hng dn ngi dng tm hiu mt s chc nng v k thut c bn trong

MasterCAM, bao gm:

S dng thanh thc n AutoCursor Ribbon.

Ni chui.

Thit lp cc thuc tnh.

Thit lp chiu su Z.

Lm vic trong ch 2D & 3D.

Thit lp cc mt phng, hng quan st, h trc ta WCS.

Hiu chnh qu trnh thit k.



20/107

2.1.1. S dng thanh thc n AutoCursor Ribbon (Using the AutoCurrsor

Ribbon Bar).

Khi thc hin 1 lnh v i tng 2D no , thanh thc n AutoCursor Ribbon s xut hin

ngi dng nhp d liu v v tr. Cc hp thoi trong thanh ch ra v tr hin hnh ca con tr trong

khng gian lm vic (trong h ta XYZ), ng thi cng cho php ngi dng nhp vo b d liubng tay.

Thanh thc n AutoCursor Ribbon c chc nng:

Truy bt v tr con tr.

Nhp vo t bn phm ta im trn cc trc X,Y & Z.

Nhn bit & bt im cc kiu v tr c bit khi ngi dng di chuyn con tr chut ti

cc i tng hnh hc trn ca s ha.

Hnh 2.1. Thanh thc n AutoCursor Ribbon.

2.1.1.1. Cc du hiu nhn bit kiu bt im (Visual Cues).

Cc du hiu th gic l nhng biu tng ha xut hin con tr chut ch ra trng thi

lc m con tr t ng (AutoCursor) gp phi. V d, nu ta thit lp con tr nhn bit bt im i

vi im cui ca nhng i tng tn ti th khi di chuyn tr chut ti v tr im cui no n

s ngay lp tc thc hin bt im ti v tr & du hiu th gic ca im cui s xut hin.

MasterCAM cung cp cho ngi dng cc kiu bt im sau:

Kiu bt im Biu tng nghaOrigin Chn im gc

Arc Center Chn im l tm ca ng trn, cung trn

Endpoint Chn im cui ca i tng v n gin

Intersec Chn im giao ca 2 i tng

Midpoint Chn im gia ca i tng


Ghi AutoCursor

Thit lp AutoCursor

Ta con tr Ch Fastpoint


21/107

Point Chn im d tn ti

Quadrant Chn im ti gc phn t ca ng trn

Nearest Chn im nm trn i tng c chn

Relative Chn im c v tr tng i so vi im khc

Mo: Trong qu trnh con tr t ng bt im c kch hot, ngi dng c th tm thi lm

mt hiu lc bt im bng cch gi phm Ctrl khi di chut ti cc i tng trn ca s

ha.

2.1.1.2. Nhp gi tr ta cc im.

Bn cnh chc nng thc hin bt im cc i tng th thanh AutoCursoor Ribbon cn dng

nhp gi tr ta cc im trong qu trnh lm vic vi cc i tng v (xem hnh 2.1).

Cc phng php nhp ta con tr:

Nhp ln lt ta trn cc trc X, Y & Z bng cch t con tr vo 3 hp thoi ta trn

thanh AutoCursor Ribbon & nh vo gi tr cn thit. Nhn Enter hay Tab chp nhn gi tr va

nhp & chuyn sang hp thoi ta tip sau.

n X, Y hoc Z m 1 hp thoi, sau nhp gi tr ta tng ng cho hp thoi ny.

y ta c th nhp vo 1 phn s hay 1 s thp phn (v d 3/8 hay 0.375) cng nh cc cng thc

cha cc php ton cng, tr, nhn, chia,...

Bi ging MasterCAM

Nhp ta

X=3.0 ;Y=3.0 im -c

to

G

c

3.

0

2.

0

1

Cente

r

im -cto 2

Endpoin

t

3

Interse

c

Las

t

Midpoin

t

Relativ

e

Poin

t

Quadra

nt

Chn 1

im tn ti

tr-c

Chn t

ngim cui

cng-c

to

im tnti

X =

2.3

Y =

1.2

b nk

nh

=3

To 1 im ti

imphn t- cung

trn

Origi

nim

gc(0,0)

21


22/107

Kch vo mi tn th xung ca mi hp thoi la chn gi tr t chui danh sch c trc.

Nhy phi vo vng pha trong cc hp thoi truy nhp vo danh sch cc li tt u vo d

liu. la chn 1 gi tr li tt no , t danh sch x xung la chn 1 gi tr t danh sch cc kiu

ch ci tng ng. Sau , la chn 1 gi tr ta trn ca s ha th gi tr ny s c gn t

ng vo hp thoi ta . (Hnh 2.2)

Hnh 2.2.

S dng ch Fastpoint.

Kch trc tip ln ca s ha la chn ta cho im .

Nhn Shift + kch chut tri thit lp gi tr ta mi c quan h vi i tng c sntrn ca s ha.

2.1.1.3. S dng ch Fastpoint nhp ta im.

Ch Fastpoint s dng thay th cho cc trng ring bit cha cc gi tr ta X, Y & Z,

hp nht 3 trng ny vo 1 hp thoi ta . Trong hp thoi ny, ngi dng c th xc nh gi tr

ta ca 1 im bng cch nhp vo cc gi tr s tng ng vi X, Y, Z c phn tch bi du

phy, cng c th s dng li tt u vo d liu hay cc cng thc ton hc.

s dng ch Fastpoint (hnh 2.3.)bt c khi no thanh AutoCursor Ribbon c kchhot, ta s dng mt trong cc phng php sau:

Nhn phm cch Space bar trn bn phm.

Kch vo nt lnh Fastpoint trn thanh AutoCursor Ribbon.



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Hnh 2.3. Ch Fastpoint.

nhp ta 1 im: Nhp vo t bn phm cc gi tr s tng ng vi trc X, Y, Z cch

nhau bi du phy. V d: 2, 3, 5.

n Enter chp nhn gi tr va nhp hay Esc hy b.

y ta c th nhp vo 1 phn s hay 1 s thp phn ( v d 3/8 hay 0.375) cng nh cc cngthc cha cc php ton cng, tr, nhn, chia,...

Mo: S dng cc k hiu i s khi nhp cc cng thc. V d, im c ta X6, Y3, Z0.5 c

th nhp l X(2*3)Y(5-2)Z(1/2) hay 6,3,.5.

2.1.1.4. Ty chnh cc la chn bt im.

thit lp cc kiu bt im cc i tng khc nhau trn ca s ha, ta truy nhp vo biutng trn thanh AutoCursor Ribbon. Khi , 1 hp thoi cha cc la chn s xut hin. Ta c

th b hay chp nhn kiu bt im no bng cch tch vo biu tng . Sau khi chp nhn

, cc kiu bt im ny s c hiu lc vi tt c cc s la chn & c duy tr cho ti khi ta

thit lp li cc kiu bt im mi.

Hnh 2.4. Hp thoi thit lp cc ch bt im.



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2.1.1.5. S dng AutoCursor Override.

Trong qu trnh v, ngi dng c th tm thi thay i cc thit lp bt im xy dng

trong AutoCursor Settings cho mt i tng c th.V d, trong AutoCursor Settings ta chn

ton b cc kiu bt im cn thit nhng bc v hin hnh ta ch chn 1 kiu bt imArc Center

v ng trn. Khi ta s kch vo biu tng AutoCursor Override , la chn biutng trong danh sch th xung. La chn s c duy tr khi ta chuyn sang v vi i tng

tip theo.

Hnh 2.5. Cc la chn trong danh sch th xung AutoCursor Override.

2.1.2. La chn cc i tng.

Khi xy dng cc i tng hnh hc, ta c th la chn mt s phng php chn lc cc itng.trong ca s ha, bao gm:

Kch chut tri, s dng cc gi , hng dn la chn 1 hay nhiu i tng.

S dng cc quyn chn trong thanh cng c General Selection Ribbon.

Xu chui (phn 2.1.3.).

2.1.2.1. S dng thanh cng c General Selection Ribbon.

S dng thanh cng c General Selection Ribbon la chn phng php chn lc i tng

trn ca s ha. Thanh cng c ny hot ng 2 ch khc nhau: Standard Selection & Solid

Selection. Vic ch no c hiu lc ph thuc vo kiu i tng cha trong h s lm vic & cc

chc nng la chn t cc thanh thc n & thanh cng c trong MasterCAM.

Nu ta chn 1 chc nng lm vic vi vt th khi c (Solid) th thanh cng c General

Selection Ribbon s t ng chuyn v ch Solid Selection.



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Hnh 2.6. Ch Solid Selection.Cn nu trong h s ang lm vic khng cha khi c (Solid) th ch Solid selection s

khng c hiu lc, ngi dng ch c th lm vic vi ch Standard Selection.

Hnh 2.7. Ch Standard Selection.

Cc phng php la chn trong ch Standard Selection:

Chain: la chn/ xu chui cc i tng c lin kt vi cc i tng khc.V d: kch

vo 1 cnh ca 1 hnh ch nht chn c 4 cnh ca hnh ch nht , hay kch vo 1 on thng c

giao im vi cnh khc la chn c 2 cnh.

Window: la chn cc i tng bng cch v 1 hnh ca s bao quanh chng.

Polygon: la chn cc i tng bng cch v 1 hnh a gic bao quanh cc i tng .Kch p khi kt thc v ng a gic tng tng.

Single: la chn tng i tng c bit bng cch kch chut tri ln i tng .

Area: la chn tp hp cc i tng hnh hc 2D kn bng cch ln lt kch chut tri

vo khng gian ca i tng .

Vector: la chn tp hp cc i tng bng cch v 1 vector xuyn qua chng. Khi , tt

c cc i tng c vector ny ct qua u c la chn.

Mo: Trong ch Standard Selection:

Ta c th bt tm thi la chn Vector bng cch gi phm Alt & di chut tri

v vector ct qua cc i tng c la chn.

lm mt hiu lc ca ch la chn hin hnh, ng thi bt 1 trong 2 ch

la chn Chain & Area. & chuyn i qua li gia 2 phng php , ta nhn

phm Shift khi kch vo i tng hay vo 1 v tr no trong khng gian. Nu ta



26/107

t con tr ln 1 i tng khi gi phm Shift th ch Chain s c kch hot,

cn nu t con tr vo vng bn trong ca 1 bin dng kn th ch Area s c

kch hot, tng ng l bin dng kn s c la chn.

2.1.3. Xu chui.

Xu chui l quy trnh la chn & kt ni cc phn i tng hnh hc hnh thnh nn c sca 1 ng chy dao, b mt hay khi c. Khi nim c bn ny ca MasterCAM c nhng ng

dng quan trng c trong qu trnh thit k & gia cng m phng c kh.

Khi xu chui hnh hc th mt hay nhiu tp hp cc ng cong (line, arc, spline) c im cui

tip gip nhau s c la chn. Khc vi cc phng php la chn khc, cc ng cong c la

chn trong ch xu chui c lin kt theo th t & phngnht nh. Chnh th t & phng

xu chui ny nh hng mnh m ti cch thc hnh thnh nn b mt, khi c & ng chy dao

trong MasterCAM.

Khi thc hin ni chui, hp thoi Chaining s xut hin. Nu h s chi tit hin hnh cha cc

i tng dng khung dy (wireframe) & khi c (solid), ngi dng c th kch vo cc nt lnh

pha trn nh hp thoi la chn kiu i tng mun xu chui (hnh 2.8).

Hnh 2.8.

2.1.3.1. Xu chui cc i tng hnh hc khung dy.

Xu chui cc i tng hnh hc khung dy tng t nh s dng ch Standard Selection

trong General Selection. Cc i tng c la chn s c cng mt mu mc nh nhn bit.

Ngi dng c th s dng cc la chn trong hp thoi Chaining chn:

Mt phng hnh hc (Geometry Plane): Ngi dng c th xu chui cc i tng trongkhng gian 3D hay ch trong mt phng ang lm vic. Xu chui trong khng gian 3D cho

php kt ni cc i tng trong nhiu mt phng khc nhau. Cn xu chui trong Cplane

ch cho php kt ni cc i tng trong cng 1 mt phng.

Chc nng cc nt lnh trong hp thoi:



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Last: La chn li chui i tng cui cng thit lp. V d, s dng la chn ny

hiu chnh chui hnh thnh nn b mt do bc trc gy ra li li. MasterCAM s t ng

bin tp, hiu chnh, xu chui li cc i tng chnh xc theo phng & theo th t yu cu.

End chain: Kt thc bin tp chui i tng ang lm vic nhng vn duy tr

nhngchc nng thit lp.

Unselect: B la chn tt cc cc i tng chn.



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Hnh 2.9.Hp thoi xu chui cc i tng hnh hc dng khung dy & khi c.

Reverse: o ngc chiu ca chui.

Start/End of Chain: S dng cc nt lnh Start& Endny thay i v tr

cc i tng im u & im cui ca chui.



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Dynamic move start/end of chain: S dng con tr thay i t ng cc im u

& im cui.

2.1.3.1. Xu chui cc i tng hnh hc khi c.

Trong la chn Solid, hp thoi Chaining cung cp cc la chn xu chui cc i tng hnhhc khi c. Cc nt lnh trong xu chui cc i tng hnh hc khi c cho php ngi dng ly

vo hay loi b cc kiu yu t t hp thoi la chn, bao gm:

Edge: La chn hay loi b cc cnh ca khi 3D ang xy dng.

Face: La chn hay loi b cc mt ca khi 3D ang xy dng.

Loop (ch c hiu lc khi xy dng ng chy dao 3D ): to ra 1 chui ng kn

(khng c cc im r nhnh) - ta c th la chn 1 cnh, 1 mt tham chiu, 1 resulting loop &

im u ca chui.

Partial loop (ch c hiu lc khi xy dng ng chy dao 3D): to ra 1 chui h -

ta c th la chn cnh xut pht, mt tham chiu & cnh kt thc ca chui.

From Back: ch ch cho la chn cc cnh hay mt ca khi 3D nm trn mt sau

ca hng quan st. Khi tt ch ny, ngc li, ta ch c php la chn cc cnh hay mt ca

khi 3D nm trn mt trc ca hng quan st.

2.1.4. Thit lp cc thuc tnh.

Tt c cc i tng trong MasterCAM u c cc thuc tnh c bn (cc c tnh vt l). Ph

thuc vo kiu i tng, cc thuc tnh c th bao gm:

Mu sc.

Kiu im.

Kiu ng & dy nt.

Cp .

Trong qu trnh thit k, ty thuc cc i tng khc nhau m ta phi ta phi xy dng cc

thuc tnh vt l ph hp cho i tng . Vic tng tc vi thanh trng thi s gip ngi dng d

dng & nhanh chng la chn cc thuc tnh cho i tng mi.

Hnh 2.10. Thanh trng thi.



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31/107

Hnh 2.12.Hp thoi Entity Attributes Manager

m hp thoi mu sc & la chn mu, hy kch p vo biu tng mu mu.

Ch : Ngi dng cng c th s dng hp thoi ng dng cc thuc tnh thit lp i

vi cc h s c chuyn i t cc chng trnh khc. Khi ta ch cn tch vo hp

kim .4. Khi tt c cc thuc tnh ca cc kiu i tng c thit lp, kch OK chp nhn &

quay tr v hp thoi Attributes.

Quan trng: Nu ngi dng thay i li cc thng s trong hp kim EAMgr

trong hp thoi Attributes th tt c cc thit lp trc

trong hp thoi Entity Attributes Manager s b v hiu.



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2.1.4.2. Thay i cc thuc tnh ca i tng.

thay i thuc tnh ca cc i tng tn ti, ta c th s dng cc phng php sau y:

Ch : Cc phng php ny khng lm thay i cc gi tr thit lp trong cc trng thuc

tnh ca thanh trng thi; chng ch lm thay i i tng c la chn.

Thay i thuc tnh bng nt chut phi:

1. (Khng bt buc) S dng cc phng php la chn thng thng chn ra cc i tng

cn thay i.

2. Nhy phi trng thuc tnh trn thanh trng thi cn thay i.

Mo: thay i ng thi nhiu thuc tnh hy nhy phi ln nt lnh Attributes trn thanh

trng thi.

3. Nu i tng c la chn trong bc 1 ta s b qua bc 4. Mt khc, khi c li nhc

ta li s dng cc phng php la chn thng thng

chn i tng. Sau n phm Enter hoc chn lnh End Selection trn thanh cng c

General Selection Ribbon m hp thoi cn lm vic trn thanh trng thi.

4. Trn c s cc thuc tnh la chn bc 2, s dng mt trong cc hp thoi di y

thc hin cc thay i cn thit.

5. Kch OK chp nhn s thay i cho i tng c la chn & ng hp thoi thuc tnh.

Hnh 2.13. Cc hp thoi la chn thay i thuc tnh trn thanh trng thi.



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Hnh 2.13. Cc hp thoi la chn thay i trn thanh trng thi.

thay i thuc tnh ca tt c cc i tng trong kiu i tng no (V d im, ng,spline):

1. Trn thanh trng thi, kch nt lnh Attributes.

2. Trong hp thoi Attributes , kch hp kim EA Mgr , sau kch nt

lnh EA Mgr.

3. Trong hp thoi Entity Attributes Manager, la chn kiu i tng & thit lp kiu thuc

tnh mun s dng trong bn v MasterCAM ang lm vic (Hnh 2.12).

4. Kch nt lnh cp nht tt c cc kiu i tng c la chn ang

tn ti trn bn v ang lm vic & ng hp thoi li.

Ch : loi b cc thuc tnh va la chn & tip tc s dng cc thuc tnh ban u

cho cc i tng v tip theo, b tch hp kim . Ngc li, tch vo hp

kim s dng cc thuc tnh va la chn hay thit lp cc thuc tnh mi.



34/107

Mo: Ta c th s dng chc nng Analyze sa i cc thuc tnh cng nh cc tnh cht

khc ca i tng. c thm thng tin, xem phn Phn tch cc i tng.

2.1.5. Thit lp chiu su Z.

Trng Z trn thanh trng thi s dng thit lp gi tr chiu su Z cho i tng hnh hc &

ng chy dao. Thng thng ta dng cc phng php sau thit lp chiu su Z:

Nhp gi tr chiu su Z vo hp thoi t bn phm.

Kch vo mi tn th xung bn phi hp thoi ly 1 gi tr chiu su t danh sch cc

gi tr c sn.

Kch ln nhn Z & la chn 1 im trn ca s ha s dng gi tr chiu su Z ca

im .

2.1.6. Lm vic trong ch 2D & 3D.

Ty thuc dng hnh hc to dng, ta s s dng nt lnh 2D/3D trn thanh trng thi

thit lp ch v. Trng thi mc nh khi vo ca s ha l 3D. chuyn i gia 2 ch ,

n gin ch cn kch vo nt lnh, v d t 3D chuyn sang 2D: - kch chut - .

Trong ch v 2D, tt c cc i tng hnh hc c to ra u song song vi mt phng xy

dng (Cplane) hin hnh. Mun chn chiu su Z mi cho i tng ang v, ta ch cn nhp gi th

ta vo hp thoi trn thanh trng thi thay cho gi tr c.

Trong ch 3D, cc gi tr ta u c c t con tr t ng khi thc hin v phc. Khi

, vic thit lp chiu su Z khng c hiu lc. Khi lm vic trong mi trng 3D, ngi dng c th

xy dng cc i tng m cc im to nn chng nm trn cc mt phng khc nhau, ...

Trong c 2 ch , nhp cc gi tr ta , ngi dng u phi tng tc vi con tr t ng

(AutoCursor), cc chc nng cn thit trn thanh Ribbon hay cc trng hp thoi.

Quan trng: Thit lp 2D/3D khng tc ng ti cc chc nng phn tch (Analyze) & ng

chy dao (Toolpath).

c lp vi chc nng thit lp ch 2D/3D trn thanh trng thi, cc chc nng di y c

th cung cp cho ngi dng cc gii php v 3D hu hiu:

Fillets & Chamfers.

Convert to NURBS.

Control Point NURBS.

Surfaces & Solids.



35/107

CloseArc. Simplify.

Xform:Translate, Translate 3D, Mirror, Rotate, Rectangular Array, Scale.

Mo:Vic khng ch ti quan h gia mt phng xy dng hin hnh (Cplane) & chiu su Z

l nguyn nhn ph bin gy ra li khi v cc i tng hnh hc. trnh li ny, ngidng nn ch quan st mn hnh ha (Gview) trng vi mt phng Cplane hay

ch Isometric.

2.1.7. Thit lp mt phng, khung nhn & h ta lm vic (WCS Work

Coodinate System).

WCS l h ta linh hot c s dng ph bin trong MasterCAM. H ta ny bao gm

cc trc X, Y, Z c hng, cng vi im Zero ( im gc). Vic thao tc vi mt phng WCS cng

nh vic thit lp cc mt phng & khung nhn lm n gin ha qu trnh xy dng cc i tng

hnh hc b mt, khi c & ng chy dao l nhng k nng ct yu ngi dng cn nm c khi

lm vic trong mi trng MasterCAM. Phn ny s hng dn ngi dng v:

Cch s dng WCS & mt phng Tplane thit lp ng chy dao.

H ta trn my tin.

Mo: Trong MasterCAM, chng trnh s lu tt c cc la chn mt phng, hng quan st &

WCS c s dng trong cc bn v trc i vi mi nhm my. V d nu 1 nhm

my c cc ng chy dao nm mt trc trn bn v, cn 1 nhm my khc c ngchy dao nm mt bn ca bn v, th bt c khi no ngi dng kch hot nhm my

no trong 2 nhm my ny ln, MasterCAM cng s t ng kch hot cc mt phng

khung nhn ca nhm my tng ng ln s dng gn nht trc .

2.1.7.1. Hng quan st, mt phng & h ta .

Trong MasterCAM, ngi dng s s dng h ta -cc 3D lm vic trong khng gian 3

chiu. Ta ca cc i tng hnh hc & ng chy dao c biu din trn 3 trc ta : X, Y &

Z. Mi trc c k hiu bng cc du dng (+) & m (-) xc nh chiu tng ng.



36/107

Hnh 2.14.K hiu cc trc ta .

MasterCAM cung cp cho ngi dng nhiu cng c hu ch bin i, che ph, ct lt, ... cc

i tng vn dng h ta -cc v & gia cng chi tit. s dng h ta , ngi dng phi

s dng cc cng c xc nh 1 khung nhn (view) c th. Mt khung nhn gm 2 phn:

Mt mt phng, hay mt ct qua h ta . im gc.

quan st vt th ta s dng cng c Graphic View (Gview); nh hng i tng hnh hc

ta s dng cng c Contruction Planes (Cplanes); cn nh hng ng chy dao ta s s dng

cng c Tool Planes (Tplanes).

Gviews l hnh chiu phi cnh quan st chi tit trn ca s ha.

Cplanes biu din cc mt phng trn xy dng cc i tng hnh hc mi.

Tplanes l mt ct xc nh ng chy dao .

Trong MasterCAM, cc khung nhn tiu chun hay ngi dng t t u c t tn & lu tr

theo cc thng tin i km bn v. Khi cn thit ta c th s dng chnh cc khung nhn ny thay i

s nh hng vt th trong khng gian 3D.

Mo: Ta c th s dng chut & bn phm theo cc cch di y thay i khung nhn

ha (Gview):

S dng thanh cun chut phng to/ thu nh vt th cn quan st.

Gi phm Alt ng thi kch & gi thanh cun chut, sau di chut xoay vt

th theo cc phng bt k trong khng gian.

S dng cc phm mi tn ln , xung , tri , phi di chuyn vt th

theo cc phng xung ln, phi, tri tng ng.

Gi phm Alt ng thi n cc phm mi tn ln , xung, tri, phi

xoay vt th trong khng gian theo quy lut & quanh 1 trc nht nh tng ng.

Gc quay mi ln l 50.

2.1.7.2. Cc khung nhn tiu chun.

Mi bn v trong MasterCAM u c cc khung nhn tiu chun tng ng vi 6 mt ca hnh

lp phng (Top nh, Front trc, Back sau, Right phi, Left tri, Bottom - y) & khung

nhn 3D Isometric. Cc khung nhn ny l mc nh, cha trong b d liu gc ca MasterCAM.

Ngi dng c th s dng lm vic trong tt c cc bn v, tuy nhin khng th thay i tn cng

nh h ta ca chng.



37/107

Trn thanh trang thi, cc thanh thc n Gview, Planes & WCS cung cp cho ngi dng cc

quyn chn la chn cc khung nhn tiu chun, xy dng cc khung nhn t do, cng nh thit lp

cc hng quan st ha, chn mt phng lm vic & ng chy dao, h ta lm vic.

Hnh 2.15. Cc khung nhn tiu chun.

v cc i tng hnh hc hay xy dng ng chy dao trn 1 mt phng no , ta s s

dng cc cng c trn thanh thc n Planes la chn mt phng v phc hay mt ng chy dao.

Cc la chn ny s thit lp ng thi c mt phng v phc (Cplanes) & mt phng ng chy dao

(Tplanes). Mi chc nng trong thanh thc n ny u cho php ngi dng xy dng hng mt

phng cng nh im gc.

Mo: thit mt phng Cplane & Tplane c lp ta phi s dng cng c ci t (trn

thanh trng thi) chn thm khung Cplane & Tplane vo thanh trng thi. Trong hp

thoi Customize status bar (xut hin sau khi kch vo nt lnh - hnh 2.16), kch

chut phi vo khu vc lm vic chn thm 2 trng Cplane & Tplane (hnh 2.17).

Sau khi kch OK chp nhn thay i trong hp thoi, ta c th s dng cc

thanh thc n Cplane & Tplane mi xut hin trn thanh cng c la chn c lp

mt phng v phc & mt phng ng chy dao (hnh 2.18).

Hnh 2.16.Hp thoi Customize status bar.



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Hnh 2.17. Chn thm 2 trng Cplane & Tplane.

Hnh 2.18. Thanh thc n Cplane & Tplane.

Cc la chn trn thanh thc n WCS cho php ngi dng hng h ta lm vic theo 1

khung nhn c th. c th l 1 khung nhn tiu chun, 1 khung nhn ngi dng t thit lp

thun li cho qu trnh quan st, v & gia cng chi tit.



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Trong MasterCAM, mt phng & khung nhn c tch ra thnh cc chc nng ring r, do

vic la chn mt phng tng tc i vi mi chc nng l c lp vi nhau. V d, ta vn c th

quan st chi tit theo khung nhn Isometric (Gview = Isometric) trong khi ang thc hin v phc

mt trc ca chi tit (Cplane = Front).

Ch : i vi hnh hc 2D thun ty, mt phng TOP ca Cplane & Tplane (mc nh) tng

ng vi mt phng XY tiu chun

2.1.7.3. S dng cc la chn trong thc n Gview/ Planes/ WCS ca thanh trng thi.

Hnh 2.19. Gview, Planes & WCS.

gip ngi dng hiu & d s dng cc la chn thc n Gview, planes & WCS trn thanh

trng thi, phn di y s m t chi tit chc nng ca mi cng c ny.

Standard View: Bao gm cc la chn Top, Front, Back, Right, Left, Bottom & Isometric. Khi

la chn cc khung quan st chun t thanh thc n Gview hay Planes, mt phng la chn s c

quan h vi h ta hin hnh.



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Named: la chn hng quan st vt th bng cch la chn trong danh sch cc la chn trong

hp thoi View Selection. Hp thoi ny s hin th tt c cc hng nhn trong khng gian, k c cc

hng nhn tiu chun & do ngi dng t thit lp (hnh 2.20).

Hnh 2.20.Hp thoi View Selection.Geometry: ging mt phng c la chn thng hng theo hnh hc b mt ly t ca s

ha. Khi thao tc vi cng c ny ta phi chn 1 cung trn, 2 ng thng hay 3 im nh ngha

mt phng.

Solid face: cch xy dng tng t nh Geometry, nhng y ta s dng mt phng vi 1 mt

khi c.

Rotate: to 1 hng chiu mi bng cch quay vt th trong khung nhn hin ti quanh 1 trc ta

1 gc no (hnh 2.21).



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Hnh 2.21.

Dynamic (ch c trong Gview): quay vt th theo cc hng quan st bt k c la chn trong

khng gian bng cch ko di chut theo 1 trc bt k i qua 1 im c xc nh ban u.

Last: quan st vt th trong khung nhn trc .

Normal: la chn khung nhn theo 1 ng thng no trong khng gian.= Gview: thit lp mt phng lm vic la chn trng vi khung nhn ca Gview hin hnh.

= Tplane, = Cplane: ging mt phng lm vic la chn trng vi khung nhn ca Tplane,

Cplane hin hnh.

= WCS (ch c trong Planes): Thit lp Tplane & Cplane c khung nhn ging nh WCS hin

hnh.

Always = WCS (ch c trong Planes): lin kt Tplane & Cplane vi WCS. Khi , mi thay i

trn WCS s t ng c cp nht vo Tplane & Cplane. ng thi, khi bt chc nng ny th tt ccc la chn khc trn s mt hiu lc & b m i trn thanh thc n la chn.

Origin: hin th im gc ca khung nhn hay mt phng. Khi c hin th, chng trnh s cho

php la chn & tha i im gc ny.

Saved as: cho bit khung nhn mi c lu tn & hin th hay cha.

Save(ch c trong Gview): nu khung nhn hin hnh cha c lu li, la chn ny s m ra hp

thoi New View (hnh 2.22) cho php la chn cc thng s, t & lu tn theo mun ngi dng

(nu hng quan st hin hnh cha c lu li, trn ca s ha MasterCAM s hin dng thng

bo ).



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Hnh 2.22.Hp thoi New View.

2.1.7.4. S dng WCS & Tplanes thit lp ng chy dao.

Trong phn ny ta s xt cc tnh hung & v d ph bin s dng WCS & Tplanes thit k

cc cng vic c th.

2.1.7.4.1. Hng dn chung.

i vi cc chng trnh gia cng trn my phay 3 trc, h ta lm vic WCS thng gn vi

khung nhn TOP, & TOP cng c chn l mt phng dng c khi gia cng chi tit.

Khi c trc quay, cn ch cc thng tin sau y:

Nu g quay lin tc trong qu trnh gia cng th phi tch ring WCS & Tplane, tip

s dng la chn Rotary trn th Toolpath Parameter.

Nu g phi quay ti 1 v tr c nh trc khi thc hin gia cng theo ng chy dao

2D hay 3D thng thng th phi chn Tplane theo 1 mt phng mong mun trc khixy dng ng chy dao.

i vi cc my gia cng 5 trc & ng chy dao a trc th mt phng dng c phi

xy dng trn nhiu b mt khc nhau.

2.1.4.7.2. Dch chuyn h ta theo chi tit.

Trong v d ny, ta cn gia cng chi tit dng mng trn nm trn mt bn gia cng nh hnh

2.23, nhng bn v trong MasterCAM li c nh hng theo 1 mt khng tiu chun. V l do no

, ta khng th quay, di chuyn hay bin i i tng hnh hc trn bn v c.



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Hnh 2.23.

gii quyt tnh hung ny, ta cn phi thit lp 1 khung nhn mi theo b mt hnh hc chi tit

cn gia cng. Mun vy, trn thc n ca trng WCS trn thanh trng thi ta chn Geometry, tip

lc chn 1 cung trn, 2 ng thng song song hay 3 im thit lp 1 mt phng. S dng hp

thoi New View t tn cho khung nhn mi, nh v im gc theo 1 im thch hp,... Cui cng

kichs OK kt thc cng vic.

Sau khi la chn c khung nhn mi cho h ta lm vic WCS, ta phi gn Tplane &

Cplane theo khung nhn . Khi , chn Planes t thanh trng thi, chn Top (WCS). Xy dng

ng chy dao 2D nh thng l. Khi gn ln chi tit, lnh chuyn ng ca ng chy dao 2D

s c xc nh t gc phi, vi v tr phi c thit lp theo yu cu gia cng.

2.1.4.7.3. Gia cng 2 chi tit trn 2 g khc nhau.

Hnh 2.24. Gia cng 2 chi tit trn 2 g khc nhau.

Trong v d ny, ta cn iu khin gia cng 2 chi tit khc nhau. Mi chi tit c c nh trn 1 g nh hnh v 2.24.

Trong trng hp ny, mi g s c gn 1 v tr b dao (work offset) khc nhau. Khi ,

mi ng dng d c xy dng tng ng cho mi chi tit gia cng s c 1 gi tr b dao nht

nh. Nh quan h to ra khi b dao , ta s khng phi quan tm n cch nh v g trn bn

my nh th no.



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thc hin, chn View Manager t thc n ca trng WCS trn thanh trng thi. Tip

s dng hp thoi View Manager xy dng 1 khung nhn mi cho mi g. thit lp cc

khung nhn, kch vo khung nhn Top & chn Copy. Sau t tn cho cc khung nhn& nhp gi tr

b dao cho mi g. Tip theo, chn Origin t thc n ca trng Planes trn thanh trng thi,

chn 1 im no trn g (nh trn hnh 2.24) nh ngha im gc cho khung nhn.

Trc khi gia cng chi tit, chn Named t thc n trng Planes ca thanh trng thi & la

chn khung nhn khai bo cho g. Khi gia cng, MasterCAm s t ng xut ra cc m b dao

chnh xc & thit lp v tr ca dng c ct ph hp vi im gc ca mi g.

2.1.7.5. H ta my tin.

H ta trong my tin truyn thng rt khc so vi h ta ca my phay. Thay v s dng

h ta 3 chiu XYZ, h ta ca 1 my tin in hnh li gm c 2 trc: trc Z (trng trc quay

ca trc chnh) & trc X vung gc vi n (hnh 2.25).

MasterCAM h tr cc chc nng thit lp cc chi tit gia cng bng phng php tin cng nhng chy dao cho cc kiu my tin khc nhau. Cc cng c ny bao gm xc nh loi my lm

vic, chn mt phng gia cng, & thit lp h ta lm vic. Phn di y s hng dn ngi dng

cc k nng lm vic vi h ta my tin.

Hnh 2.25.H ta my tin & my phay.

2.1.7.5.1. nh ngha loi dao & my tin.

nh ngha my dng khai bo trc chnh & u revolve dng c ct, phng & chiu ca

cc trc ta trn my tinTrn my tin nhiu trc, nhiu cha dao, cc trc ta ring bit nmtrn cc trc khc nhau, MasterCAM cho php lin kt cc trc ta ny thnh 1 t hp trc trong h

ta my tin.

nh ngha dng c ctc tc dng ch r cha dao, trc chnh gn vi dng c ct, phng

& chiu ca dng c ct trong khng gian.Do , khi la chn 1 dng c ct c khai bo trong

nh ngha dng c ct, cc thng s lin quan n cha dao, trc chnh & hng ca dng c ct s

t ng c c ra & s dng trong qu trnh gia cng.



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2.1.7.5.2. Quay h ta dng c my tin.

MasterCAM h tr thm trc B ti cc trc quay v tr lp t dng c ct ca my tin

tng t nh trn my phay. Trc quay ny cho php quay 1 gc no thay i gc nghing dng

c ct trong khng gian.

thit lp thng s gc quay thch hp, thay v thay i mt phng Tplane nh trn my phay,

ng chy dao my tin ta s nhp gc nghing dng c ct bng cch kch vo nt lnh Tool

Angle trn th Toolpath parameters.

Ch : la chn ny ch c hiu lc khi xc nh trc quay trong my tin m phng ang lm

vic.

Mo: Gc nghing dng c ct cng c th c lu tr trong nh ngha dng c. c

bit, tin ch ny gip h tr nhng my tin khng c trc B thit lp gc

nghing gia dng c ct & cc trc chnh. i vi my tin c tch hp trc B, tas nhp vo gc bng 0 trong nh ngha dng c dng c ct lun song song vi

trc chnh khi c thay i cha dng c ct (trang 146/410). Sau , trong hp

thoi Tool Angle ta s nhp gc nghing dng c ct theo yu cu lm vic c th.

Quan trng: ...

2.1.7.5.3. Mt phng dng hnh ca my tin (Lathe Cplane)

MasterCAM cung cp cc mt phng dng hnh c bit cho php ngi dng tng tc thn

thin hn trong cc h ta my tin. i vi cc ng dng gia cng tin 2D ph thng, h ta

c la chn t thanh thc n Planes trn thanh trng thi (hnh 2.26).



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Hnh 2.28. Thanh cng c SKETCHER.

Thao tc v cc i tng hnh hc 2D & 3D c bn trong MasterCAM rt linh hot, thn thin.

n gin ch cn la chn chc nng v phc t danh sch th xung, kch chut vo khu vc ca s

ha & v i tng cn thit lp. Ngoi ra, ta cng c th s dng chc nng ca thanh Ribbon hay

cc la chn trong hp thoi nh ngha & hiu chnh cc thng s ca i tng hnh hc.

2.2.2. V im (Points).

Lnh Point s dng v 1 im trn bn v trong ca s ha.

v 1 im, kch vo biu tng Point trn thanh cng c Sketch la chn lnh v

im no t thc n th xung (hnh 2.29), hay chn theo ng dn Creat/Point..

Hnh 2.29. Thanh thc n Point.

2.2.2.1. Creat Point Position:

ngha: V cc im ring bit bng cch kch chut & nhp vo ta hp l ca im trn

ca s ha.

Thao tc: v im, n gin kch vo 1 v tr no trn ca s ha, hoc nhp gi tr ta cho im vo hp thoi . Kt thc lnh kch

OK , hoc nhn phm Esc.



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Hnh 2.30. Creat Point Position.

Phm tt:

T hiu chnh ta im.

O c nh i tng & thot khi chc nng.

2.2.2.2. Creat Point Dynamic:

ngha: V cc im nm trn phng i qua 1 i tng hnh hc c sn.

Thao tc: v im theo phng php ny, ta phi chn 1 on thng lm phng, tip

nhp khong cch ca im cn v so vi im cui ca on thng & khong cch vung gc tnh

t im (offset) ti on thng ly lm phng. Kt thc lnh kch OK , hoc nhn phm Esc.

Hnh 2.31. Creat Point Dynamic.

Phm tt:

T hiu chnh ta im.

D khong cch.

F khong dch chuyn song song.

P chp nhn kt qu.


2.2.2.3. Creat Point Node Points:

ngha: V cc im nm ti im nt ca ng Spline c sn.



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Thao tc: v, trc ht ta phi c 1 ng spline (ng cong tham s). Tip kch vo

lnh , ri kch chut ln ng spline trn ca s ha. Kt thc lnh kch OK , hoc nhn

phm Esc.

Hnh 2.32. Creat Point Node Points.

2.2.2.4. Creat Point Segment:

ngha: V 1 chui cc im cch u nhau dc theo i tng hnh hc no c sn.

Thao tc: v im, kch vo lnh Creat Point Segment, chn on thng tham chiu. Sau

nhp vo hp thoi s im hay khong cch gia cc im trong chui

. Kt thc lnh kch OK , hoc nhn phm Esc.

Hnh 2.33. Creat Point Segment.

Phm tt:

D khong cch gia cc im.

N s im cn v.

P chp nhn kt qu.




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2.2.2.5. Creat Point Endpoints:

ngha: T ng v cc im ti cc im cui ca tt c cc i tng hnh hc on thng,

cung trn hay spline trn bn v.

Thao tc: v, n gin ch cn kch vo nt lnh, cc im cui s t ng c cp nht ln

ca s ha. Kt thc lnh kch OK , hoc nhn phm Esc.

Hnh 2.34. Creat Point Endpoints.

2.2.2.6. Creat Point Small Arcs:

ngha: V cc im i qua tm ca cc cung hay ng trn trn bn v.

Thao tc: thao tc vi lnh ny, trc ht trn cc trng trn thanh Ribbon, chn bn knh

ln nht ca cc i tng cn ly tm ,la chn ly hay khng ly cung trn , xa

hay gi nguyn ng hay cung trn sau khi v im . Kt thc lnh kch OK , hoc nhn phm

Esc.

Hnh 2.35. Creat Point Small Arcs.

Phm tt:

M bn knh ln nht ca i tng c chn.

P chp nhn chn cung trn.

D xa b ng trn & cung trn sau khi v im.


Mo: kt thc v 1 lnh:

Kch OK.



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Nhn phm Enter.

Nhn phm Esc.

La chn 1 lnh khc.

2.2.3. V on thng (Lines).Lnh Line s dng v 1 on thng trn bn v trong ca s ha.

v 1 on thng, kch vo biu tng Line trn thanh cng c Sketch la chn lnh

v on thng no t thc n th xung (hnh 2.36), hay chn theo ng dn Creat/Line.

Hnh 2.35. Cc kiu quan h khi v on thng.

Hnh 2.36. Thanh thc n LINE.

2.2.3.1. Creat Line Endpoint:



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ngha: Xy dng cc kiu on thng a dng c ni bng 2 im cui, bao gm cc tham

s: gc , chiu di , dng nm ngang & thng ng , tip tuyn vi 1 ng cong c sn

, chui ng thng lin tip c chung im nt .

M t la chn ca line

Nhp gi tr ta (XYZ) hoc kch chut To ra 1 line bng cch nhp ta

Multi Line To ra 1 chui cc on thng lin tip

Polar To ra 1 line bng cch nhp di v gc

Vertical To ra 1 line thng ng

Horizontal To ra 1 line nm ngang

TangentTo ra 1 line tip xc vi 2 cung trn

Phm tt:

1 v im th nht.

2 v im th 2.

M v 1 chui cc on thng lin tip.

L chiu di on thng.

A gc nghing.

A on thng nm thng ng.H on thng nm ngang.

T v on thng tip xc vi 1 cung cong.

P chp nhn kt qu.


2.2.3.2. Creat Line Closest:

ngha: V on thng ni lin 2 i tng hnh hc no ti v tr gn nhau nht gia 2 itng (hnh 2.37).

Thao tc: v on thng, ta ch cn kch ln lt vo 2 i tng c sn trn ca s ha,

chng trnh s t ng tm 2 im gn nht gia 2 i tng ny ni lin chng li vi nhau. Kt

thc lnh kch OK , hoc nhn phm Esc.



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Hnh 2.37. Creat Line Closest.

2.2.3.3. Creat Line Bisect:

ngha: V 1 on thng l ng phn gic ca 2 ng thng cho trc.

Thao tc: v on thng ta ch cn kch nt lnh trn thc n Line, nhp vo chiu di

on thng cn v & chn 2 on thng c sn trn ca s ha, la chn on thng

cn gi li. Kt thc lnh kch OK , hoc nhn phm Esc (hnh 2.38).

Hnh 2.38. Creat Line Bisect.

Phm tt:

L chiu di on thng.

P chp nhn kt qu.


2.2.3.4. Creat Line Perpendicular:

ngha: V 1 on thng vung gc vi 1 on thng c sn, vung gc vi ng tip tuyn

ti 1 im trn 1 ng trn (cung trn) no , hay vung gc vi 1 on thng & tip tuyn vi 1

ng trn (cung trn) cho trc.



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P

2

P

1

P

3

P

3

P

2Hnh 2.40

Thao tc: v on thng, kch vo lnh trn thc n Line, nhp chiu di on thng

, chn i tng tham chiu, chn tip xc (nu l ng trn hay cung trn) &

on thng c gi li nu cn thit. Kt thc lnh kch OK , hoc nhn phm Esc (hnh 2.39).

Hnh 2.39. 3 kiu v on thng trong Creat Line Perpendicular.

Phm tt:

1 v im u mt ca on thng.

L chiu di on thng.


P chp nhn kt qu.


Th tc to ra 1 line vung gc vi 1 line tip xc vi 1 cung trn tn ti .(hnh 2.40)

To ra 1 cung trn v 1 line. Chn 1 line:

kch P1. Kch chn biu

tng .

Xc nh cung trn c 1 line tip xc

ti: kch P2.

Nhp di ca line vung gc (nhn

enter):

Chn line gi : kch P3

Ch : tng t nh trn ta chn on thng gi li.



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2.2.3.5. Creat Line Parallel:

ngha: V 1 on thng song song vi & c chiu di bng chiu di on thng cho trc.

Thao tc: v on thng, kch vo lnh trn thc n Line, nhp khong cch (offset)

gia on thng cn v vi on thng tham chiu, chn chiu offset (1 chiu

hay 2 chiu ). Trong trng hp on thng cn v tip xc vi 1

ng cong no , th thay v nhp khong offset, sau khi kch vo on thng tham chiu, ta kch

vo lnh Tangent trn thanh Ribbon, tip kch vo ng cong tham chiu, on thng mi s

c to ra. Kt thc lnh kch OK , hoc nhn phm Esc.

Hnh 2.41. Creat Line Parallel.

Phm tt:

1 hiu chnh v tr on thng.

F o ngc chiu on thng.

D khong cch gia cc on thng (offset).


P chp nhn kt qu.


2.2.4. V ng trn & cung trn (Arcs & Circles).

Lnh Arc thng c v cc cung trn hoc ng trn. MasterCAMX cung cp 5 phng

php to ra cung trn v 2 phng php cho v ng trn.

v 1ng trn hay cung trn, kch vo biu tng Circle-Arc trn thanh cng c

Sketch la chn lnh v on thng no t thc n th xung, hay chn theo ng dn Creat/

Circle-Arc (hnh 2.43).



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Hnh 2.42. Thanh thc n Circle-Arc.

M t ngn gn cho mi cng c c th hin trong bng di y:

Quan trng: Trong MasterCAM, cung trn c mc nh v ngc chiu kim ng h.

2.2.4.1. Creat Circle Center Point.

ngha: V ng trn khi bit tm ca ng trn .

Thao tc: v ng trn, kch vo lnh trn thanh thc n Circle-Arc, kch chut tri

ln khu vc ca s ha ly ta tm ng trn hoc nhp ta tm vo hp thoi

.

Tip , trn thanh Ribbon, nhp bn knh ng trn , hoc kch vo lnh& chn i tng tip xc vi ng trn cn v.

Kt thc lnh kch OK , hoc nhn phm Esc.

Phm tt:

N hiu chnh ta tm ng trn.

R nhp bn knh ng trn.

Bi ging MasterCAM

Circle Edge Point To ra ng trn khi bit 2 im v bn knh

Circle Center Point To ra ng trn khi bit tm v cc thng s khc

Arc Polar To ra 1 cung trn bng cch s dng h to cc

Arc Polar Endpoints To ra 1 cung trn khi bit 2 im u, bn knh v gc chn cung

Arc Endpoint To ra 1 cung trn khi bit 2 im u v ng knh hoc bn knh

Arc 3 Points To ra 1 cung trn khi bit 3 im

Arc Tangent To ra 1 cung trn tip xc vi cc i tng khc

56


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Hnh 2.43. Cc kiu ng trn xy dng trong Circle Center Point.

D nhp ng knh ng trn.

T v ng trn tip xc vi 1 ng thng hay cung cong.

c P chp nhn kt qu.


2.2.4.2. Creat Arc Polar.

ngha: V cung trn trong h ta cc.

Thao tc: v cung trn, theo phng php ny ta c 2 cch thao tc:

Cch 1: Kch vo lnh trn thanh thc n Circle-Arc, kch chut tri ln khu vc ca s

ha ly hoc nhp ta tm ng trn , bn

knh (hoc ng knh) , gc xut pht , gc kt thc

ca cung trn, chiu v cung trn . Kt thc lnh kch OK , hoc

nhn phm Esc.

Cch 2: Kch vo lnh trn thanh thc n Circle-Arc, nhp gc xut pht ca cung trn

ri kch chut tri vo lnh . Tip chn i tng tham chiu ly tip xc

(ng thng, cung trn, ), kch chn ta im cui hoc nhp gc kt thc ca cung trn vo

hp thoi , chn chiu v cung trn . Kt thc lnh kch OK , hoc

nhn phm Esc.

Hnh 2.44. Creat Arc Polar.



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Phm tt:

N hiu chnh ta tm cung trn.

F i chiu v cung trn.

R nhp bn knh cung trn.

D nhp ng knh cung trn.S chn gc xut pht ca cung trn.

A - chn gc kt thc ca cung trn.

T v cung trn tip xc vi 1 i tng cho trc.

P chp nhn kt qu.


2.2.4.3. Creat Circle Edge Point.

ngha: V ng trn i qua 3 im bt k.

Thao tc: v ng trn, theo phng php ny ta c 3 cch thao tc:

Cch 1: Kch vo lnh trn thanh thc n Circle-Arc, tip chn 3 im tham chiu no

trn ca s ha to thnh ng trn. Kt thc lnh kch OK , hoc nhn phm Esc.

Cch 2: Kch vo lnh trn thanh thc n Circle-Arc, tip trn thanh Ribbon kch vo

nt lnh ri v hay chn 2 im tham chiu to thnh ng trn. Kt thc lnh kch OK ,

hoc nhn phm Esc.


nt lnh ri chn 3 i tng tham chiu tip xc vi ng trn, hoc nhp vo bn knh ng

trn & chn 2 i tng tham chiu tip xc vi ng trn . Kt thc lnh kch

OK , hoc nhn phm Esc.

Hnh 2.45. Creat Circle Edge Point.

Phm tt:

1 v im th nht.



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2 v im th 2.

3 v im th 3.

W v ng trn i qua 2 im.

R nhp bn knh ng trn.

D nhp ng knh ng trn.

T v ng trn tip xc vi 3 i tng cho trc, hoc c bn knh no &

tip xc vi 2 i tng cho trc.

P chp nhn kt qu.


2.2.4.4. Creat Arc Endpoint.

ngha: V cung trn vi 2 im nt i qua 1 im tham chiu.Thao tc: v cung trn, theo phng php ny ta c 2 cch thao tc:

Cch 1: Kch vo lnh trn thanh thc n Circle-Arc, tip v 2 im nt trn ca s

ha & v hoc chn tip im tham chiu nm gia 2 im nt trn cung trn. Kt thc lnh kch OK

, hoc nhn phm Esc.


lnh & chn i tng tip xc vi ng trn cn v. Kt thc lnh kch OK , hoc nhn phm

Esc.

Hnh 2.46. Creat Arc Endpoint.

Phm tt:

1 v im th nht.

2 v im th 2.


D nhp ng knh cung trn.

T v cung trn tip xc vi 1 i tng cho trc.



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P chp nhn kt qu.


2.2.4.5. Creat Arc 3 Point.

ngha: V cung trn i qua 3 im.Thao tc: v cung trn, theo phng php ny ta c 2 cch thao tc:

Cch 1: Kch vo lnh trn thanh thc n Circle-Arc, tip v ln lt 3 im to thnh

cung trn (im th 2 nm gia im th 1 & 3). Kt thc lnh kch OK , hoc nhn phm Esc.

Cch 2: Kch vo lnh trn thanh thc n Circle-Arc, tip v im th nht & th 2 ca

cung trn, ri kch vo lnh trn thanh Ribbon & chn i tng tip xc vi ng trn cn v.

im tip xc chnh l im th 3 ca cung trn. Kt thc lnh kch OK , hoc nhn phm Esc.

Hnh 2.47. Creat Arc 3 Point.

Phm tt:1 v im th nht.

2 v im th 2.

3 v im th 3.

T v ng trn tip xc vi 3 i tng cho trc, hoc c bn knh no &

tip xc vi 2 i tng cho trc.

P chp nhn kt qu.


2.2.4.6. Creat Arc Polar Endpoint.

ngha: V cung trn khi bit im xut pht, bn knh & gc chn cung.

Thao tc: v cung trn, trc ht ta kch vo lnh trn thanh thc n Circle-Arc. Khi

thanh Ribbon xut hin, chn im xut pht ca cung trn l im nt u hay cui , nhp gi



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tr bn knh (ng knh ) cung trn, gc xut pht &

gc kt thc . Sau c th hiu chnh v tr im xut pht ca cung trn bng cch

kch vo lnh . Kt thc lnh kch OK , hoc nhn phm Esc.

Hinh 2.48. Creat Arc Polar Endpoint.

Phm tt:

1 xc nh v tr im.xut pht ca cung trn.

T im nt u cung trn l im xut pht.

N im nt cui cung trn l im xut pht.


D nhp ng knh cung trn.

S gc xut pht.

A gc kt thc.

P chp nhn kt qu.


2.2.4.6. Creat ArcTangent.

ngha: V cung trn tip xc vi 1, 2, hoc nhiu ng thng hoc cung trn.

Hnh 2.49. Creat ArcTangent.



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Thao tc: v cung trn, trc ht ta kch vo lnh trn thanh thc n Circle-Arc. C 4

phng php v cung trn tip xc:

Phng php 1:1 entity: To ra 1 cung trn 1800 tip xc vi 1 i tng c chn.

Theo phng php ny th trnh t v nh sau:

La chn i tng tip xc vi ng cong.

La chn im tip xc.

Khi s c 2 ng trn tng ng vi 4 cung trn 1800 xut hin,

ta chn phn cung trn c gi li trong 4 cung trn trn.


Phng php 2: Point : To ra 1 cung trn tip xc vi 1 i tng v i qua i tng

khc. Theo phng php ny th trnh t v nh sau:

La chn i tng tip xc vi ng cong.

Nhp bn knh cung trn & chn 1 im tham chiu nm trn cung trn

.

Khi s c 2 ng trn tng ng vi 4 cung trn, ta chn phn

cung trn c gi li trong 4 cung trn trn.


Phng php 3: Center line: To ra 1 ng trn tip xc vi 1 ng thng & c tm nm

trn ng thng khc. Theo phng php ny th trnh t v nh sau:

La chn ng thng tham chiu tip xc vi ng trn

cn v.

Nhp bn knh cung trn & chn 1 ng thng tham chiu

cha tm ng trn .

Khi s c 2 ng trn, ta chn 1 ng trn gi li trong 2 ng trn .


Phng php 4: Dynamic: To ra 1 cung trn tip xc ti im chn

trn i tng tham chiu. Theo phng php ny th trnh t v nh sau:

La chn i tng tham chiu tip (ng thng, ng cong,)

xc vi ng trn cn v.



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La chn 1 im trn i tng tham chiu lm im tip xc (c th s dng mi tn

trt dn hng hoc bt im ).

V im nt cn li ca cung trn.


Phm tt:

1 Cung trn tip xc vi 1 i tng cho trc.

N Cung trn tip xc vi 1 i tng & i qua 1 im tham chiu cho trc.

C ng trn tip xc vi 1 ng thng & c tm nm trn 1 ng thng

khc.

Y Cung trn tip xc vi 1 i tng ti 1 im nm trn i tng .

R nhp bn knh cung trn.D nhp ng knh cung trn.

S bt im.

P chp nhn kt qu.


2.2.5. V cc i tng hnh hc hnh dng hn hp (Miscellaneous Shapes).

Cc lnh trn thanh thc n ny dng v cc i tng hnh hc c phc tp cao, v dnh a gic, elip, ng xon c,

Hnh 2.50. Cc i tng hnh hc hnh dng hn hp.



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v 1ng trn hay cung trn, kch vo biu tng Miscellanenous Shape trn thanh

cng c Sketch la chn lnh v t thc n th xung (hnh 2.50), hay chn trong thanh thc n

Creat.

2.2.5.1. Creat Rectangle (V hnh ch nht).

ngha: V hnh ch nht bng cch xc nh 2 nh i din.

Thao tc: v hnh ch nht, ta c 2 cch thao tc:

Cch 1: Kch vo lnh trn thanh thc n Miscellanenous Shape, tip v ln lt 2 nh

i din bng cch kch chut ln ca s ha hoc nhp gi tr ta vo hp thoi

, hoc v 1 im & nhp chiu di &

chiu rng hnh ch nht, kt qu ta c 1 hnh ch nht cn v. Kt thc lnh kch OK

, hoc nhn phm Esc.

Cch 2: Kch vo lnh trn thanh thc n Miscellanenous Shape, tip kch vo lnh

trn thanh Ribbon v tm ca hnh ch nht, ri xc nh 1 nh hoc nhp chiu di

& chiu rng hnh ch nht. Kt thc lnh kch OK , hoc nhn

phm Esc.

Ngoi ra, to ra 1 b mt trn c s hnh ch nht, trn thanh Ribbon chn lnh . Khi

trong mi hnh ch nht s c cc li chia.

Hnh 2.51. Creat Rectangle.

Phm tt:

1 V nh th nht ca hnh ch nht.

2 V nh th 2 i din ca hnh ch nht.

W Chiu rng hnh ch nht.

H Chiu di hnh ch nht.

A V tm ca hnh ch nht.

S V mt k trong hnh ch nht.



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P chp nhn kt qu.


2.2.5.2. Creat Rectangular Shape (V hnh c dng hnh ch nht).

ngha: Xy dng hnh hc b mt khung dy c dng hnh ch nht n thun hoc c chamt k theo phng php im c s & phng php 2 im.

Thao tc: xy dng hnh hc khung dy ny, ta c 2 phng php thao tc:

Phng php 1: Kch vo lnh trn thanh thc n Miscellanenous Shapes, hp thoi

Rectangular Shapes Options xut hin. Chn vo la chn & v 1 im c s , nhp

vo chiu di & chiu rng ca hnh ch nht tham chiu. Tip

, kch vo nt lnh m cc chc nng nng cao ca hp thoi.

hp thoi m rng ny ta s s dng thm cc la chn (hnh 2.53):

Biu tng ngha

V cung ln vi gi tr bn knh xc nh ti cc nh ca hnh chnht.

V gc nghing ca hnh ch nht tham chiu.

Cc dng hnh hc c to ra trn c s hn ch nht tham chiu.

V tr im tham chiu xc nh v tr ca hnh hc khung dyc xy dng.

V mt k trong hnh hc khung dy va xy dng.Hin ta tm hnh ch nht tham chiu.

Thc hin la chn & hiu chnh i tng. Sau khi v ta c th thit lp li v tr ca im c s

bng cch kch vo nt lnh trong hp thoi Rectangular Shapes Options.




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Hnh 2.52. Cc phng php v Creat Rectangular Shape vi Base Point.

Hnh 2.53.Hp thoi Rectangular Shapes Options vi Base Point .



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Phng php 2: Kch vo lnh trn thanh thc n Miscellanenous Shapes, hp thoi

Rectangular Shapes Options xut hin. Chn vo la chn & v 2 im c s &

xc nh hnh ch nht tham chiu. Tip , kch vo nt lnh m cc chc nng nng caoca hp thoi.

Hnh 2.54.Hp thoi Rectangular Shapes Options vi 2 Points.

hp thoi m rng ny ta s s dng thm cc la chn (hnh 2.54):

Biu tng ngha

V cung ln vi gi tr bn knh xc nh ti cc nh ca hnh ch

nht.V gc nghing ca hnh ch nht tham chiu.

Cc dng hnh hc c to ra trn c s hnh ch nht tham chiu.



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V mt k trong hnh hc khung dy va xy dng.

Hin ta tm hnh ch nht tham chiu.

Thc hin la chn & hiu chnh i tng. Sau khi v ta c th thit lp li v tr ca 2 im c

s bng cch kch vo cc nt lnh trong hp thoi Rectangular Shapes Options.


Hnh 2.55. Cc phng php v Creat Rectangular Shape vi 2 Points.

2.2.5.3. Creat Polygon (V hnh a gic u).

ngha: Xy dng hnh hc b mt khung dy c dng hnh a gic u.

Thao tc: xy dng hnh hc khung dy ny, trc tin ta kch vo lnh trn thanh thc

n Miscellanenous Shapes, hp thoi Polygon xut hin.

Trn ca s ha v tm a gic u . Trong hp thoi Polygon, ln lt nhp s cnh

, bn knh ng trn ni tip hoc ngoi tip a gic

. Tip , kch vo nt lnh (hnh 2.56) m cc chc nng nng cao ca hp

thoi, nhp vo gi tr cung ln ti cc nh a gic & gc nghing ca a gic

. Ngoi ra, c th kch vo hp kim v mt k trong hnh hc khung dy

va xy dng & hin ta tm ng trn tham chiu

Thc hin la chn & hiu chnh i tng. Sau khi v ta c th thit lp li v tr ta tm

ng trn & bn knh ng trn ni (ngoi) tip a gic .




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Hnh 2.56. Cc phng php v Polygon.

Hnh 2.57.Hp thoi Polygon.

2.2.5.4. Creat Ellipse.

ngha: Xy dng hnh hc b mt khung dy c dng hnh elip.

Thao tc: xy dng hnh hc khung dy ny, trc tin ta kch vo lnh trn thanh thc

n Miscellanenous Shapes, hp thoi Ellipse xut hin.

Trn ca s ha v tm elip . Trong hp thoi Ellipse, ln lt nhp cc gi tr bn knh

& . Tip , kch vo nt lnh (hnh 2.58) m cc chc

nng nng cao ca hp thoi, nhp vo gi tr gc xut pht & gc kt thc



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ca elip, gc nghing ca elip . Ngoi ra, c th kch vo hp kim

v mt k trong hnh hc khung dy va xy dng & hin ta tm elip.

Thc hin la chn & hiu chnh i tng. Sau khi v ta c th thit lp li v tr ta tm

& cc bn knh ca elip & .


Hnh 2.58.Hp thoi Ellipse.

Hnh 2.59. Cc v d v Ellipse.



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2.2.5.5. Creat Bounding Box (Xy dng hp ng bao).

ngha: Xy dng 1 hp ng bao hnh ch nht & hnh tr dng khung dy, khi c hoc

mu phi bao quanh cc i tng trn ca s ha. Hp ng bao cng cho php kim tra ton b

kch thc cc chi tit trong bn v MasterCAM.

Thao tc: xy dng hnh hc khung dy ny, trc tin kch vo lnh trn thanh thc

n Miscellanenous Shapes, hp thoi Bounding Box xut hin.

Trn ca s ha nhp cc i tng nm trong ng bao. Xong vic kch Enter. Tip ,

trong hp thoi Bounding Box chn & nhp cc thng s khc nh bng di y:

Biu tng ngha Hnh minh ha

La chn cc i tng nm trong

phm vi hp ng bao.Khi tch vo hp kim ny, tt c cc

i tng trn ca s ha s nm

trong phm vi ca hp ng bao.

La chn cc kiu i tng cho

ng bao.

Nu ng bao c dng

hnh ch nht (Rectangular), la

chn ny s to ra 1 ng bao kn

c ni bi cc ng thng. Nu

ng bao c dng hnh tr, la

chn s to ra 1 ng bao kn c

ni bi cc ng thng & cung trn

(s dng kt hp vi hp kim

).

La chn cho php v cc

im ti cc gc hay phn m rngca hp ng bao.

La chn to ra im

tm ca hp ng bao.



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M rng kch thc hnh l hp hp

ch nht ng bao dng hnh ch

nht theo cc phng X, Y & Z.

M rng kch thc hnh tr trn l

hp ng bao dng mt tr theo

bn knh & chiu di ng sinh

hnh tr .

Hp ng bao c chn l hnh

hp ch nht, vi cc cnh nm trn

cc trc X, Y & Z. Ta c th m

rng gi tr chiu di cc cnh hnh

hp vi cc la chn trong khung

Expand.

Hp ng bao c chn l hnh

tr trn vi ng trc nm trn 1

trc ta & mt tr bin dng nmtrong mt phng song song vi mt

phng to bi 2 trc cn li.




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Hnh 2.60. V d v Bounding Box.

Hnh 2.61.Hp thoi Bounding Box.



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2.2.5.6. Creat letters.

ngha: Hp thoi Creat letters dng v cc mu k t & s trn c s cc on thng, cung

trn & ng cong tham s NURBS.

Thao tc: v cc mu k t & s, trc tin kch vo lnh trn thanh thc n

Miscellanenous Shapes, hay chn theo ng dn Creat/Creat Letters. Hp thoi Bounding Box

xut hin.

Trong khung Alignment, la chn kiu ng dng chui k t (hnh 2.62):

Horizontal :chui k t c sp xp trn 1 ng nm ngang.

Vertical : chui k t c sp xp trn 1 ng thng ng.

Top of arc : chui k t c sp xp nm trn nh 1 ng cong.

Bottom of arc : chui k t c sp xp nm di y 1 ng cong.

Cc la chn ny ch c tc dng khi lm vic vi kiu MCXFont .

Hnh 2.62. Cc kiu ng dng chui k t.

Trong khung Parameters, thit lp cc thng s:

Height : Chiu cao k t.

Arc radius :bn knh cung trn cha chui k t.

Spacing : khong cch gia cc k t.

Drafting Option : la chn ny s c tc dng khi chn kiu

Drafting Font & TrueType Font

t hp danh sch trong khung Font. Khi kch vo nt lnh , hp



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thoi Note Text s xut hin. Tt c cc thng s v chui k t s c thit lp li

trong hp thoi ny.

Trong khung Letters, nhp vo chui k t cn v .

Trong khung Font, la chn kiu Drafting Font , MCX Font

hay TrueType Font . Nt lnh

cho php hiu chnh tn font, kiu font, kch c font,... Ngoi ra, ta c th la chn cc kiu font ch

khc t MC Directory khi la chn kiu font

t hp danh sch x xung.


2.2.5.7. Creat Spiral.

ngha: Lnh Creat Spiral dng xy dng cc ng cong xon vt Acsimet trn c s cc

ng cong tham s NURBS.

Thao tc: v cc ng cong xon vt Acsimet, trc tin kch vo lnh trn thanh thc

n Miscellanenous Shapes, hay chn theo ng dn Creat/Creat Spiral. Hp thoi Spiral s xut

hin (hnh 2.63).



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Hnh 2.63. Hp thoi SPIRAL.

Trong hp thoi, la chn & nhp vo cc thng s:

Revolution - S vng xon vt hayHeight - Chiu cao ng xon vt .

Initial Pitch - Bc xon vt ban u.

Final Pitch - Bc xon vt kt thc.

Radius - Bn knh ng trn c s ca ng xon vt.

- Chiu ca ng xon vt.

Sau chn im c s ca ng xon vt trn ca s ha.




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Hnh 2.64. V d v lnh SPIRAL.

2.2.5.8. Creat Helix.

ngha: Lnh Creat Spiral dng xy dng cc ng cong xon vt xoy trn c trn c s

cc ng cong tham s NURBS.

Thao tc: v ng cong xon vt xoy trn c, trc tin kch vo lnh trn thanh thc

n Miscellanenous Shapes, hay chn theo ng dn Creat/Creat Helix. Hp thoi Helix s xut

hin (hnh 2.64).

Trong hp thoi, la chn & nhp vo cc thng s:

Revolution - S vng xon vt hayHeight - Chiu cao ng xon

vt .

Pitch - Bc xon vt.

Radius - Bn knh ng trn c s ca ng xon vt.

Taper Angle - gc cn ca ng xon vt. Nu gc - th cn vo trong, cn

+ th cn ra ngoi.

Angle - gc xut pht ca ng xon vt.

- Chiu ca ng xon vt.

Sau chn im c s ca ng xon vt trn ca s ha.




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Hnh 2.63. Hp thoi SPIRAL.

Hnh 2.65. Cc ng HELIX nhn trong khng gian 3 chiu (Isometric).



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Hnh 2.66. Cc ng HELIX nhn theo phng vung gc vi mt phng XY (Bottom).

2.2.6. V cung ln & cnh vt (Fillets & Chamfers).

B lnh Fillets & Chamfers dng v cung ln & cnh vt cho 1 hay mt chui cc i

tng trn ca s ha.

v 1 cung ln hay cnh vt, kch vo biu tng Fillets/Chamfers trn thanh cng c

Sketch la chn lnh v no t thc n th xung, hay chn theo ng dn Creat/Fillet hay

Creat/Chamfer (hnh 2.67).

Hnh 2.67.La chn ng dn cho FILLET & CHAMFER.

2.2.6.1. Fillet Entities.

ngha: V cung ln gia 2 i tng cho trc trn bn v, k c ng thng & ng

cong.

Thao tc: v cung ln, trc ht ta kch vo lnh trn thanh thc n Fillets/Chamfers.

(hnh 2.68). Khi , trn thanh Ribbon s xut hin cc thng s la chn v cung ln.

Hnh 2.68. Fillet Entities.



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Hnh 2.69. Thanh Ribbon sau khi la chn lnh FILLET ENTITIES.

Ta c bng sau:

Biu tng ngha

Bn knh cung ln.

V cung ln gia 2 i tng, c gc cha cung nh hn 1800.

V cung ln gia 2 i tng ngc vi cung ln thng thng, cgc cha cung ln hn 1800.

V cung ln gia 2 i tng l 1 ng trn.

V cung ln gia 2 i tng vi 1 phn din tch di ra l phn vtliu gia cng trong qu trnh ct gt.

Xa i tng gc ti phn ln sau khi v cung ln.

Gi li i tng gc ti phn ln sau khi v cung ln.

Nhp ln lt cc thng s bng trn theo yu cu thit k.


Phm tt:

R bn knh cung ln.

S kiu cung ln.

T ct b phn i tng gc ti phn ln gc.

N gi li phn i tng gc ti phn ln gc.

P chp nhn kt qu.


Hnh 2.70. V d cc kiu v Fillet Entities.



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2.2.6.2. Fillet Chains.

ngha: V cung ln ti v tr cc im nt gia cc i tng cho trc trong chui i tng

c sp xp theo trt t & hng.

Thao tc: v cung ln, trc ht ta kch vo lnh trn thanh thc n

Fillets/Chamfers. (hnh 2.71). Khi , hp thoi Chaining s xut hin & trn thanh Ribbon s xut

hin cc thng s la chn v cung ln (hnh 2.72).

Hnh 2.71. Fillet Chains.

La chn cc thng s trong hp thoi Chaining, chn ng xut pht, ng kt thc, phng

& chiu v cung ln, ri kch OK .

Trn thanh Ribbon, nhp bn knh cung ln , chiu cung ln (cng, ngc

chiu kim ng h hay ln theo c 2 chiu) , kiu cung ln

, la chn gi li hay xa i phn ng thng hay cung trn gc ti

c cung ln. Cc thng s c th hin chi tit trong bng sau:

Biu tng ngha

Bn knh cung ln.

Cung ln c to ra theo c 2 chiu cng & ngc chiu kim ngh

To cung ln ngc chiu kim ng h.

To cung ln cng chiu kim ng h.

V cung ln gia cc i tng, c gc cha cung nh hn 1800

.V cung ln gia cc i tng ngc vi cung ln thng thng,c gc cha cung ln hn 1800.

V cung ln gia cc i tng l 1 ng trn.

V cung ln gia cc i tng vi 1 phn din tch di ra l phnvt liu gia cng trong qu trnh ct gt.



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Hnh 2.72.Hp thoi CHAINING &Thanh Ribbon sau khi la chn lnh FILLET CHAINS.




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Phm tt:

C La chn chui i tng, hp thoi la chn Chaining s xut hin.

R bn knh cung ln.

D - chiu cung ln.S kiu cung ln.



P chp nhn kt qu & chuyn sang la chn chui i tng mi..


Hnh 2.73 minh ha cc trng hp v trong Fillet Chains. Ban u l i tng gc & hng

pht trin cung ln, tip theo l cc trng hp fillet c th.

i tng gc & hng ln gc.



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Hnh 2.73. V d cc kiu v Fillet Chains.

2.2.6.3. Chamfer Entities.

ngha: V cnh vt gia 2 i tng cho trc trn bn v, k c ng thng & ng cong.

Thao tc: v cnh vt, trc ht ta kch vo lnh trn thanh thc n Fillets/Chamfers.

(hnh 2.74). Khi , trn thanh Ribbon s xut hin cc thng s la chn v cung ln.



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Hnh 2.74. Chamfer Entities.

Hnh 2.75. Thanh Ribbon sau khi la chn lnh CHAMFER ENTITIES.

Ta c bng sau:

Biu tng ngha

Khong cch gia giao im ca cc i tng gc & im nt cnh

vt.Gc nghing gia cnh vt & on thng gc tham chiu.

Khong cch gia giao im ca cc i tng gc ti 2 im ntcnh vt bng nhau

Cnh vt c xc nh bi 2 khong cch vt c di khc nhaugia giao im ca cc i tng gc & 2 im nt cnh vt .

Cnh vt c xc nh bi khong cch vt gia giao im ca cci tng gc vi 1 im nt cnh vt & gc nghing gia cnh vt& on thng gc tham chiu.

Cnh vt c xc nh bi chiu di ca chnh cnh vt (mcnh gc nghing gia cnh vt & on thng gc tham chiu l450).

Xa i tng gc ti phn cnh vt sau khi v cnh vt .

Gi li i tng gc ti phn cnh vt sau khi v cnh vt .



Phm tt:

1 Khong cch gia giao im ca cc i tng gc & im nt th 1 cnh vt.

2 Khong cch gia giao im ca cc i tng gc & im nt th 2 cnh vt..

A Gc nghing gia cnh vt & on thng gc tham chiu.

S Kiu vt gc.



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T Xa phn i tng gc ti phn vt gc.

N Gi li phn i tng gc ti phn vt gc.

P chp nhn kt qu.


Hnh 2.76. V d cc kiu v Chamfer Entities.

2.2.6.2. Chamfer Chains.

ngha: V cnh vt ti v tr cc im nt gia cc i tng cho trc trong chui i tng

c sp xp theo trt t & hng.

Thao tc: v cnh vt, trc ht ta kch vo lnh trn thanh thc n Fillets/Chamfers.

(hnh 2.77). Khi , hp thoi Chaining s xut hin & trn thanh Ribbon s xut hin cc thng s

la chn v cung ln (hnh 2.72).

Hnh 2.77. Fillet Chains.

La chn cc thng s trong hp thoi Chaining, chn ng xut pht, ng kt thc, phng

& chiu v cnh vt, ri kch OK .

Trn thanh Ribbon, chn kiu vt gc hoc ;

nhp khong cch gia giao im ca cc i tng gc & im nt cnh vt (nu

kiu vt gc l ), hoc chiu di cnh vt (nu kiu vt gc l



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), la chn gi li hay xa i phn ng thng hay cung trn gc

ti c cnh vt. Cc thng s c th hin chi tit trong bng sau:

Biu tng ngha

Khong cch gia giao im ca cc i tng gc & im nt cnh

vt hoc chiu di cnh vt.Cnh vt c xc nh bi khong cch gia giao im ca cc i

tng gc & 2 im nt cnh vt.

Cnh vt c xc nh bi chiu di ca chnh cnh vt (mc

nh gc nghing gia cnh vt & on thng gc tham chiu l 450)





Phm tt:

C La chn chui i tng, hp thoi la chn Chaining s xut hin.

D khong cch gia giao im ca cc i tng gc & im nt cnh vt hoc

chiu di cnh vt.

S kiu vt gc.



P chp nhn kt qu & chuyn sang la chn chui i tng mi..




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Hnh 2.78.Hp thoi CHAINING &Thanh Ribbon sau khi la chn lnh CHAMFER CHAINS.

Hnh 2.79 minh ha cc trng hp v trong Fillet Chains. Ban u l i tng gc & hng

pht trin cung ln, tip theo l cc trng hp fillet c th.



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i tng gc & hng vt gc.

Hnh 2.79. V d cc kiu v Chamfer Chains.

2.2.7. V ng cong tham s SPLINE.

Trong MasterCAM, lnh v SPLINE cho php to ra cc ng cong tham s i qua cc im

nt to thnh ng cong trn lin tc trong ca s ha. Tham s ng cong Spline c thay i

mt cch linh hot. N c gi cho n khi i qua tt c cc im nt. Tng ng Spline ca ngi

thit k, cc th tc tnh ton quy nh c cong v nghing gn ging vi nhng pha ca cc

im.

NURBS l c vit tt t cm tNon Unifrom Ration B Spline ca ng cong hay mt

phng. Khi a ra, NURBS lm trn hn so vi tnh u u ca ng cong Spline v c th hiu

chnh d dng hn bng vic a ra cc im iu khin. N l cng c hu dng v cc ng

cong hoc mt phng.

v 1 im, kch vo biu tng Spline trn thanh cng c Sketch la chn lnh v

im no t thc n th xung, hay chn theo ng dn Creat/ Spline (hnh 2.80).



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Hnh 2.80. Thanh thc nSPLINE.

C 4 phng php v ng cong Spline:

Manual a ra bng tay tt c cc im cho ng cong spline.

Automatic a ra t ng tt c cc im cho ng cong spline.

Curves To ra spline t i tng tn ti.

Blended To ra spline c tnh n cong trn ca ng conghoc ng

bai giang mastercamgood

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