karpagam academy of higher education (under section 3 of

KARPAGAM UNIVERSITY Karpagam Academy of Higher Education

(Under Section 3 of UGC Act 1956) Coimbatore – 641 021.

Faculty of Engineering Department of Mechanical Engineering

COMPUTER AIDED MANUFACTURING (CAM)

LABORATORY MANUAL

Name : ------------------------------------------------------------

Register No: -------------------------------------------------------------

1

www.Vidyarthiplus.com

KARPAGAM UNIVERSITY

COIMBATORE – 641 021.

Department of Mechanical Engineering

This is to certify that this -----------------------------------------------------

record work done by Mr. /Ms. --------------------------------------------------------------------------------------------

for the course B.E. Mechanical Engineering during III Year / V Semester of

Academic year 2012 – 2013 is bonafide.

Staff in-charge H.O.D.

REGISTER No. : ----------------------------------------------------------------

This record is submitted for V Semester B.E. Practical Examination

of Karpagam University conducted on -----------------------------

Internal Examiner External Examiner


LIST OF EXERCISES

1. MANUAL PART PROGRAMMING (Using G and M Codes) in CNC

lathe

1.1 Part programming for Linear and Circular interpolation, Chamfering

and Grooving

1.2 Part programming using standard canned cycles for Turning, Facing,

Taper turning and Thread cutting

2. MANUAL PART PROGRAMMING (using G and M codes) in CNC milling

2.1 Part programming for Linear and Circular interpolation and Contour

motions.

2.2 Part programming involving canned cycles for Drilling, Peck drilling,

and Boring.

3. SIMULATION AND NC CODE GENERATION

NC code generation using CAD / CAM software‟s - Post processing

for standard CNC Controls like FANUC, Hiedenhain etc.


List of Experiments

Expt.

No. Name of the Experiment

Page

No

Marks signature

1

2

3

4

5

6

7

8

9


Requirements for safe operation of a cnc lathe, milling machine

PERSONAL SAFETY: A) Safety glasses must be worn at all times when in the area of the milling machine! Sharp fragments of metal

may fly off at high velocity. Protect your eyes at all times. Failure to comply may result in revocation of shop

privileges.

B) An attendant must be at the control panel and at or aml supervisor must be in the immediate area at all times

during cnc operation. Furthermore, each student is responsible to know how to emergency stop the milling

machine before starting the machine. Software glitches can cause the cutting head to veer off unexpectedly

resulting in severe damage to the machine.

C) Warning!! Loose clothing, long hair, personal stereo wires, jewelry, and gloves may become entangled in

rotating equipment leading to serious injury or death! Make certain that such articles are removed or securely

fastened to avoid entanglement.

D) Warning!! Milling cutters can be extremely sharp. When changing tools, always wrap the cutter in a rag. Do

not touch the cutting edges with your bare hands. Never touch a rotating tool bit.

E) The chips produced in the milling process can also be razor sharp. Always use a brush to clean a machine. Do

not use compressed air to blow the chips off of the machine or your clothes. Blown chips may get into eyes

or puncture skin.

F) Never reach over the machine while the cutter is rotating and never attempt to measure parts or clean the

machine while the milling cutter is rotating.

G) Warning!! Make certain that the work piece is securely fixture and that all components of the fixture are

securely fastened to the table. Because of the enormous forces involved in milling, failure to check security

may result in items being flung from the setup causing bodily injury. If you are not sure if your setup is safe,

have at a or staff member check it out before you begin cutting. Pay extra attention to the position and angle

of toe clamps.

H) Apply all coolants to the tool bit in a safe manner. Use extreme care when adjusting spray nozzles! The

magnetic bases holding the spray nozzles may slip. Therefore, hold the base while adjusting the nozzle. If a

base falls into the cutter, personal injury or machine damage may result. It is recommended that the spindle

be placed on hold before adjusting spray direction.

I) Report all oil and grease spills immediately! These are an extreme slip hazard!!

J) If the work piece begins to vibrate, or the cutter makes excessive noise, stop cutting immediately.

K) Before powering up the spindle, make certain that the milling cutter, its tool holder, and the spindle, are free

of the work piece and will not run into any of the fix Turing components. Also, make certain all loose tools,

spindle wrenches, chuck keys, and measuring tools have been removed from the machine and put in the

proper location.


MACHINE SAFETY:

A) The spindle must be completely stopped before attempting to change from low gear to high gear or vice

versa. Conversely, speed selection within a gear range should only be done with the spindle running.

B) Calculate the proper spindle speed and table feed rate before beginning a cut. Do not attempt to take a heavier

cut than the cutter or the work piece setup can handle. Make certain to use a proper safety factor for the

rigidity of the set up and the condition of the tooling. If you are not sure about your calculations, ask!

C) Make certain that the milling cutter is rotating in the proper direction before beginning a cut, otherwise the

milling cutter will burn up.

D) Check that table or spindle locks are off before engaging the associated power feed. If you do not know

how to operate a machine or do not fully understand the instructions you have been given, ask a

supervisor until you are certain about what is required. If you don‟t

CNC LATHE MACHINE


STUDY OF CNC LATHE MACHINE

CNC Lathe machines are the major machine tools used for the production of rotating parts. They are

available with multiple tooling, flexible automation equipment and rotary tooling. The operations such as

milling, drilling, tapping and other operation scan beper formed with the same set up.

Types of CNC Lathe Machines

1. Horizontal CNC Lathe machines.

2. Vertical CNC Lathe machines.

Classification of CNC Horizontal lathe machines

1. Chucking machines

2. Shaft machines

3. Universal machines

1. Chucking machines

Chucking machines usually have shorter beds and a single saddle with a single drum type turret

which accommodates both I.D and O.D tools.

2. Shaft machines

Shaft machines are used mainly for between centre works. They have hydraulic (or) pneumatic tail

stock for the work piece.

3. Universal machines

Universal machines are suitable for both chucking and for bar work 4 or 5 axis

machines. Some machines have rotating tools in the turrets to facilitate off - axis machining such as drilling,

milling, reaming, tapping, boring etc. These machines have in addition to the conventional X and Z-axis.

CNC control of the spindle rotation i.e. C - axis such machines are known as CNC turning centers.

Vertical CNC Lathe machines

Vertical CNC Lathe machines are widely used for machining heavy components.


LMW – Smart Junior CNC Lathe Machine

Technical Specifications:

SPECIFICATIONS UNIT SMART JUNIOR

CAPACITY

Swing Over Bed mm 480

Swing Over Carriage mm 260

Acimit Between Center mm 345

Maximum Turning Length mm 275*

Maximum Turning Diameter mm 200

Chuck Size mm 130(5‟)

SPINDLE

Spindle Nose Flat○115

Spindle Nose Taper 1/20

Hole Through Spindle mm 53

Maximum Bar Capacity mm 30

Spindle Speed Range rpm 60-6000

Motor Power (Cont/30 Min) kw 5.5/7

Maximum Torque In Spindle nm 47

Spindle Front Bearing (Id) mm 80

Max Load (With Chuck) Opposite End Free kg 150

Max Weight Of Load (Indexing Chuck) kg 200

TURRET

Number Of Stations 8

Tool Shank Size mm 20 X 20

Maximum Boring Bar Diameter mm 32

Indexing Bi-Directional

Indexing Time (Per Station) sec 1.0

TAIL STOCK

Quill Dia / Stroke mm 65/80

Quill Taper Mt-4

Tailstock Base Stroke mm 185


SPECIFICATIONS UNIT SMART JUNIOR

FEED SYSTEM

Cross Travel (X Axis) mm 105

Longitudinal Travel (Z Axis) mm 320

Rapid Traverse (X/Z Axis) m/min 20-20

X Axis Motor Torque nm 6.0

Z Axis Motor Torque nm 6.0

X Axis Motor Torque Power kw 1.48

Z Axis Motor Torque Power kw 1.48

Ball Screw – X Axis (Dia X Pitch) mm 25 X 10

Ball Screw – Z Axis (Dia X Pitch) mm 32 X 10

Feedback Element Type Absolute Encoder

Guide Way On All Axis Type Lm Guide Ways

GENERAL

Maximum Size (Length X Breadth X Height) mm 2275 X 2003 X 1915

Floor Space Required (App) m2 4.0

Weight (Approx.) kg 2300

Air Requirement (At Ntp) Basic Machine lpm Nil

Air Requirement (At Ntp) For Option lpm Nil

Lubrication For Slide ways And Ball Screw Type Automatic Pressure Lubrication With Fault

Detection

Lubrication For Spindle Bearing Type Grease Packed

Coolant Tank Capacity Ltr 80

Coolant Pump Motor kw 0.25

POWER SUPPLY

Voltage v Ac 415±10%

Frequency hz 50±1

Power kva 13

ACCURACY

Positioning Of Slides: X - Axis mm 0.015

Positioning Of Slides: Z - Axis mm 0.025

Repeatability mm ±0.003

CNC System Siemens 802d


ADDRESS CHARACTERS

Alphabet Meaning / used in

ANG Angular dimension (used in direct drawing dimension programming)

CHR Chamfering amount (automatic insertion of chamfers)

F Feed function

Dwell time with G04

G Preparatory function

K Lead of thread in G33

I Thread taper angle in G33

M Miscellaneous function

N Sequence number /block number

RND Radius in between two angles

D Offset page number

CR Radius of arc in G02 & G03

S Speed function

T Tool function

X Absolute dimension in X-axis, diametrical value(with G90)

z Absolute dimension in Z-axis, distances from job zero (with G90)


Miscellaneous functions: [M □□] PREPARTORY FUNCTIONS: {G□□}

G00 Rapid positioning

G01 Linear interpolation

G02 Circular interpolation CW

G03 Circular interpolation CCW

G04 Dwell

G09 Exact stop

G70 Inch input

G71 Metric input

G75 Zero return

G33 Thread cutting

G40 Toll nose radius compensation cancel

G41 Toll nose radius compensation left

G42 Toll nose radius compensation right

G96 Constant surface speed command

G97 Spindle speed command

G94 Feed per minute

G95 Feed per revolution

CYCLES: {G□□}

M00 Temporary program stop

M01 Optional stop

M02 Program end

M03 CW spindle rotation

M04 CCW spindle rotation

M05 Spindle stop

M08 Coolant pump on

M09 Coolant pump off

M10 Chuck clamp

M11 Chuck unclamp

M12 Tailstock quill out / (M25)

M13 Tailstock quill in /(M26)

M19 Spindle orientation on

M20 Spindle orientation off

M30 Program end and rewind

M41 Spindle speed low

M42 Spindle speed high

M82 Chuck pressure 1

M83 Chuck pressure 2

M85 Auto door open

M86 Auto door close

M17 Sub-program end

Cycle 82 Center-Drilling

Cycle 83 Deep Hole-Drilling

Cycle 84 Rigid Tapping

Cycle 85 Reaming

Cycle 95 Stock Removal

Cycle 97 Thread cutting cycle

Cycle 93 Grooving Cycle


AXES CONTROL AND DIRECTION IN CNC LATHE MACHINES


INTRODUCTION TO PROGRAMMING

Program

Program is the series of instruction statements containing the contents of works written in

conformity with the rule according to the processing schedule. A program is necessary when operating the

cnc machine tool. It is specified by inputting an alphabet and numerical succeeding to it.

supposing we have to machine a component as shown adjacent, starting from point a passing

through points b,c,d,e,f and ending at point a, the program is as follows.

PROGRAM DESRIPTION

4567 Program number

N1; Sequence Number

MSG (“FINISHING) Comment indicating operation

T04D1; Selecting turret station no .4

G96 S200 LIMS=3000 M03; Rotating spindle clock wise at 200m/mm & Limiting maximum spindle speed

G00 X70 Z1 Rapid approaching up to point b

G01 Z-20 F0.2: Cutting up to at feed 0.2mm/rev.

X90. Cutting up to point d

Z-75. Cutting up to point e.

X150. Cutting up to point f.

G00 X200 Z120. Rapid returning to point a

M01; Optional stop.

M30; Advising end of program


CENTER DRILLING CYCLE -82 DEEP HOLE DRILLING CYCLE -83

STOCK REMOVAL IN TURNING CYCL95

RTP Retraction plane

RFP Reference plane

SDIS Safety distance

DP Drill depth

DPR Drill depth from reference plane(with out

Sign)

DTB Dwell time


RFP Reference plane


DP Final drill depth

DPR Final drill depth from reference

plane(with out sign)

FDEP First Drill Depth

FDPR First drilling depth relative to

reference plane(without sign)

DAM Amount of degression(with out sign)

DTB Dwell time at final drilling depth

DTS Dwell time at starting point

FRE Feed rate for first drilling depth

VARI Machining type(chip breaking=0,swarf

removal=1)

NPP Name of start block & end block

MID Depth of cut

FAL Z Finishing allowance in z

FAL X Finishing allowance in x

FAL Finishing allowance in contour

FF1 Feed rate fop rough

FF2 Feed rate fop undercut

FF3 Feed rate for finishing

VERI Maching type according to operation

DT Dwell time for chip breaking

DAM Path length for dwell time

VRT Retraction


THREAD CUTTING CYCLE -97 RIGID TAPPING -CYCLE -84

PIT Thread pitch

MPIT Thread pitches a thread size range

of values:3 (for m3)..60 (for m60)

SPL Thread starting point in z axis

FPL Thread end point

DM1 Thread diameter at the starting

point

DM2 Thread diameter at the end point

APP Start distance from job zero

TDEP Height of thread(thread depth)

FAL Finishing allowance

IANG In feed angle

NSP Starting point offset for the first

thread

NRC Number of roughing cuts

NID Number of idle passes

VARI Machining type (range value:1….4)

NUMT Number of threads starts


RFP Reference plane


DP Final drill depth

DPR Final drill depth from reference

plane(with out sign)

DTB Dwell time at thread depth

SDAC Direction of rotation after end of

cycle

MPIT For standard metric threads (select

direct value) range m3 to m48

PIT Pitch

POSS Spindle position

SST Speed for tapping

SST1 Speed for retraction


STUDY OF CNC MACHINING CENTER (MILLING MACHINE)

These are very important types of CNC machine tools. These are multifunction machine equipped

with automatic tool changers and are capable of carrying out milling, drilling, reaming, tapping, boring,

counter boring and allied operations.

Classification of Machining Center

Machining centers are classified according to the spindle configuration as

1. Vertical Machining Centre

2. Horizontal Machining Centre

3. Universal Machining Centre

1. Vertical Machining Center (VMC)

Vertical spindle machining centre are bed type machines with single spindle automatic tool

changers. The structural configuration is as follows X-axis traverse is provided

by table or column. Y-axis traverse is provided by the saddle (or) the column (or) ram. Z–axis traverse is

provided by the saddle (or) head stock (or) spindle head.

2. Horizontal Machining Center (HMC)

Horizontal spindle machining centre are generally single spindle machines with automatic tool

changers. Horizontal spindle machining centre generally bed type. In this type of machines X-axis traverse

is provided by table (or) column and Y-axis is provided by spindle head. The Z-axis traverse is provided by

the saddle (or) head stock (or) spindle head.

3. Universal Machining Center (UMC)

These are similar to horizontal machining centre but with the spindle axis capable

of tilting from horizontal to the vertical position continuously under computer control. This

constitutes the fifth axis of the machine. In some cases this movement is provided by tilting

of the head of the spindle.

OVER ALL VIEW OF VERTICAL MACHINING CENTRE Beds and Columns:

The way that the machining forces are directly into the bed of the machine can be considerable influence on accuracy. Cutting forces are transmitted in a loop from the spindle to the work piece and bed and back towards the spindle. Automatic Tool Changer (ATC):

Automatic tool changer is an important part of a machining center for holding the tools. The time for tool change varies between 3 to 7 seconds.


Work tables (Pallet):-

Work table is a simply a pallet which is provided with holes (or) slots to clamping of the work pieces. The work clamp table (or) the pallet is usually of square type with rounded corners. The maximum table load depends on the size of the machine.

Automatic Pallet Changer (APC): The function of the pallet changers is to interchange the pallet on the machine

which has the finished component and the other pallet with newly loaded component.

Flexible Manufacturing system (FMS):

Flexible Manufacturing System used in complete computer integrated factories with very little direct human supervision.

BFW – Sahaj Vertical Machining Center

Technical Specification:

01 Clamping Area 350mm X 600mm

02 No. I Width I CD Of T -Slots 3 / 14 / 125

03 Maximum Safe Load On Table 250 Kg

04 Distance From Table To Spindle Face 150 - 500mm

05 Distance From Spindle Center To Column Face 150 - 500mm

06 Distance From Floor To Table Top 750mm

Traverse

07 X-Axis 750 mm

08 Y-Axis 300 mm

09 Z-Axis 350 mm

Axis Drive

10 Feed Rates 1-10000 m/min

11 Rapid Feed Rate X/Y/Z Axis 36/36/36 m/min

Spindle

12 Power (Cont./ 30 Min. Rating) 3.7/5.5 kw

5.5/7.5 kw

13 Spindle 8000 rpm

10000 rpm

14 Taper BT 40

Auto Tool Changer


15 No. Of Tools 12

16 Maximum Tool Diameter With Adj. Pocket Empty 80/125

17 Maximum Tool Length 150 mm

18 Maximum Tool Weight 8 kg

19 Tool Change Time (Tool To Tool) 2.2 sec

Accuracy

20 Positioning ±0.005 mm

21 Repeatability ±0.003 mm

Installation Data

22 Machine Weight (Approx.) 2500 kg approx.

- 23 Total Connected Load 20 kva

24 Pneumatic Supply 6 bar

25 Power Supply 415V, 50 Hz, 3 Phase

26 CNC System Fanuc Oimc

* - Optional features

ADDRESS IN PROGRAM

Alphabet Character Use To Control The Functions Of a Machine Tool Is Called Address.

Address Function & Meaning

O Program Number

N Sequence Number

G Preparatory Function Selection Of Traveling Mode (Linear,Circular,Atc)

X,Y,Z Axis Travel Command

A,B,C,U,V,W Additional Axis Travel Command

R Arc Radius

I,J,K Arc Center Coordinate

F Specifying Federate

S Specifying Spindle Rotation Speed

T Specifying Tool Number

M Miscellaneous Function On/ Off Control For Machine Function

H Specifying Tool Length Offset Number


D Specifying Cutter Radius Offset Number

P(Or) X Specifying Dwell Time

P Specifying Sub-Program Number

L Specifying Number Of Repeats In Sub- Program (Or) In Canned Cycle

P,Q,R Parameter For Canned Cycle

G – CODES (PREPARATORY FUNCTION)

G-Code Includes An Address “G” And Numerical Letter.

G00 Rapid Positioning

G01 Linear Interpolation

G02 Circular Interpolation Cw

G03 Circular Interpolation Cww

G04 Dwell

G20 Inches Data Input

G21 Metric Data Input

G28 First Reference Point Return

G30 Second Reference Point Return

G40 Cutter Radius Compensation Cancel

G41 Cutter Radius Compensation Left

G42 Cutter Radius Compensation Right

G43 Tool Length Compensation(+)

G44 Tool Length Compensation(-)

G49 Tool Length Compensation Cancel

G52 Local Co- Ordinate System

G53 Machine Co-Ordinate System

G54 Work Co-Ordinate System Selection







G73 High Speed Peck Drilling Cycle

G74 Left Hand Tapping Cycle

G76 Fine Boring Cycle

G80 Canned Cycle Cancel

G81 Drilling (Or) Spot Drilling Cycle

G82 Dwell (Or) Counter Boring Cycle

G83 Peck Drilling Cycle

G84 Right Hand Tapping Cycle

G85 Reaming (Or) Rough Boring Cycle

G86 Rough Boring Cycle

G90 Absolute Input

G91 Incremental Input

G94 Feed In Mm/Min

G95 Feed In Mm/Rev

G98 Initial Point Return

G99 “R” Point Return`

M – Codes (Miscellaneous Function)

M- Code Includes An Address “M” And Numerical Letter. M –Code Is Also Known As Machine Code. It Is

Related To Auxiliary Or Switching Information Such As Spindle On/Off, Coolant On/Off And Other Machine

Functions. It Is Not Related To The Movement Of The Machine.

M00 Program Stop

M01 Optional Stop

M02 Program End

M03 Spindle Rotates Clockwise Direction

M04 Spindle Rotates Anticlockwise Direction


M05 Spindle Stop

M06 Tool Change

M07 Low Pressure Coolant On

M08 High Pressure Coolant On

M09 Coolant Off

M19 Spindle Orientation

M30 Programmed End And Rewind

M98 Sub Program Call

M99 Sub Program End

Preparatory function

G00 – Rapid Traverse or Positioning

The Cutter Moves at A Rapid (Fast) Traverse Rate With Linear Interpolation. The Rapid Traverse Rate

Depends upon the Machine Type (For Example Maximum Speed in a Two Wheeler Is 80- 120 Km/Hr Depends on

Type of Make).This Can Be Used in Air Movement like Positioning Relieving, Non Contact with Work Piece.

Format

1. G00 X--- Y---;

2. G00 Z---;

G01 –Linear Interpolation

Function F

The feed rate are used to move the cutter from one point to another point with constant feed rate. Feed

is normally is given in mm/min or mm/rev. The maximum feed in the most of the present machines are

1000-20,000 mm/min.The Rapid traverse rate and feed rate both are control by feed override switches in the

machine panel.

Example:

F {□□□□} : Four digits number following the address F

G01 X50.0 Y50.0 F100: X- axis & Y-axis move with feed 100 mm/min.


AXES CONTROL AND DIRECTION IN CNC MILLING MACHINES

Consider Bed Is Moving and Tool (Spindle) Constant

X Axis Moving Left (Towards Your Left Side) : X + Ve

X Axis Moving Right (Towards Your Right Side) : X- Ve

Y Axis Moving Away From the Machine : Y+ Ve

Y Axis Moving Towards the Machine : Y- Ve

Z Axis (Spindle) Moving Downward : Z - Ve

Z Axis (Spindle) Moving Upward : Z + Ve


CANNED CYCLE

The canned cycle can be also be called as „Hole drilling cycle‟. Machining cycle such as boring, drilling

and tapping are specified with affixed format which is shortened and performed easily.

Canned cycle programming format:

G98: Initial level return

G99: Reference (R point) in axis.

G : Cycle mode

X : Position point in X-axis.

Y : Position point in Y-axis.

R : R point position.

Z : Hole bottom level (Z point).

P : Dwell time at bottom.

Q : Cutting amount or shift amount.

F : Cutting federate.

L : Number of repeat.

G73 – High speed peck drilling cycle G74 – Left hand tapping cycle

G73 X – Y – R – Z – P –F- ; G74 X – Y – R – Z – P –F-;

X: Position point in X-axis. X: Position point in X-axis.

Y: Position point in Y-axis. Y: Position point in Y-axis.

R: R point position. R: R point position.

Z: Hole bottom level (Z point). Z: Hole bottom level (Z point).

P: Dwell time at bottom. P: Dwell time at bottom.

Q: Cutting amount or shift amount. F: Number of revolutions (RPM) X pitch (mm)

F: Cutting feed rate.


G76 –Fine boring cycle G83 –Peck drilling cycle

G76 X – Y – R – Z – Q –F-; G83 X – Y – R – Z – Q –F-;

X : Position point in X-axis. X : Position point in X-axis

Y : Position point in Y-axis. Y : Position point in Y-axis.

R : R point position. R : R point position.

Z : Hole bottom level (Z point). Z : Hole bottom level (Z point).

Q : Shift amount. Q : Depth of cut per pass.

F : Cutting feed rate. F : Cutting feed rate.

G84 –Fine boring cycle G85 –Boring or reaming cycle

G84 X – Y – R – Z –F-; G85 X – Y – R – Z –F--;

X : Position point in X-axis. X : Position point in X-axis

Y : Position point in Y-axis. Y : Position point in Y-axis.

R : R point position. R : R point position.

Z : Hole bottom level (Z point). Z : Hole bottom level (Z point).

P : Dwell time at bottom F : Cutting feed rate

F : Cu Number of revolutions (RPM) X pitch (mm)

. G86 –Fine boring cycle

G86 X – Y – R – Z –F-;

X : Position point in X-axis.

Y : Position point in Y-axis.

R : R point position.

Z : Hole bottom level (Z point).

F : Cutting federate


SUP PROGRAM

A sub program is a Child program which comes from a main progam.it is converenient to program a

repeating routine as a sub program

Main program Sub program;

O001; O002;

; ;

; ;

M98 PO002 L--;

; ;

M30; M99;

Format

M98 P- - - - - L- - -;

M98; Subprogram calling command

P ; Subprogram number (specify desired O number with address P)

L ; Number of repeats

Example; M98 PO001 L003;

In the above example program number O001 repeat three times

Note.

When L is omitted the program is repeated once,

Permissible range of L is up to 9999.

Command M99 ends the subprogram


DRAWING


EX. No: Simulation And Machining Of Simple Step Turning And

Facing Using Cnc Machine DATE:

AIM:

To write the manual part program to the given dimensions and execute in CNC lathe

MATERIAL SPECIFICATION:

Size - mm X mm

Material-

TOOLS AND EQUIPMENTS REQUIRED:

1 Vernier Caliper

2 Micrometer

3 Chuck

4. Turning tool

PROGRAM:


PROCEDURE: 1. The given geometry is studied and a part program is written using G-Codes and M-Codes.

2. The CNC machining control unit is switched on.

3. Now it enters into the simulation mode.

4 .The part program that has been written already is entered into the system.

5. For verifying the simulation is pressed and the machining process is verified.

6. The appropriate tool is selected from the tool magazine.

7. The tool offset is obtained by moving the tool.

8. Using AUTO and CYCLE START buttons the program is executed and actual machining is done on the

given work piece.

Result: Thus the manual part program was written to the given dimensions and executed in CNC LATHE. The

part manufactured was inspected using Vernier Caliper and the results were tabulated as follows.


Viva Voce

1. Write the main functions of CNC?

2. What is the difference between linear interpolation and circular interpolation?

3. The code G00 is used?

4. The code G41 is used?


DRAWING


AIM:



Size - mm X mm

Material-

TOOLS AND EQUIPMENTS REQUIRED Vernier Caliper

Micrometer

Chuck

Turning tool

PROGRAM:

EX. No: Simulation And Machining Of Tapper Turning And

Chamfering Using Cnc Machine DATE:


PROCEDURE: The given geometry is studied and a part program is written using G-Codes and M-Codes.

The CNC machining control unit is switched on.

Now it enters into the simulation mode.

The part program that has been written already is entered into the system.

For verifying the simulation is pressed and the machining process is verified.

The appropriate tool is selected from the tool magazine.

The tool offset is obtained by moving the tool.

Using AUTO and CYCLE START buttons the program is executed and actual machining is done

on the given work piece

Result: Thus the manual part program was written to the given dimensions and executed in CNC

LATHE. The part manufactured was inspected using Vernier Caliper and the results were tabulated as

follows.


Viva Voce

1. What does ISO stand for?

2. Which G-code is used for anticlockwise?

3. The code M09 is used to?

4. What are G and M codes? Give examples.


DRAWING


EX. No: Simulation And Machining Of Simple Turning,

Chamfering And Fillet Using Cnc Machine DATE:

AIM:



Size - mm X mm

Material-

TOOLS AND EQUIPMENTS REQUIRED

Vernier Caliper

Micrometer

Chuck

Turning tool

PROGRAM:









Using AUTO and CYCLE START buttons the program is executed and actual machining is done on

the given work piece

Result: Thus the manual part program was written to the given dimensions and executed in CNC LATHE.

The part manufactured was inspected using Vernier Caliper and the results were tabulated as follows:


Viva Voce

1. The code M30 is used?

2. Expand –CNC?

3. Write the meaning of following codes:-

a) M01 b) M05 c) M06 d) M03

4. List two cutting tool material for CNC turning and state their applications


DRAWING

Threading calculation

Miner dia,d=D-(2h)

h=0.649 X P,for metric thread

h= 0.649 X 1.5 =0.974mm

d= 20-(1.5 X 0.974)

=18.539


EX. No: Simulation And Machining Of Simple Turning And

Threading Cycle Using Cnc Machine DATE:

AIM:



Size - mm X mm

Material-


Vernier Caliper

Micrometer

Chuck

Turning tool

Grooving tool 3mm

PROGRAM: THREAD CUTTING CYCLE -97

PIT Thread pitch

MPIT Thread pitchas a thread size range of

values:3 (for m3)..60 (for m60)

SPL Thread starting point in z axis

FPL Thread end point

DM1 Thread diameter at the starting point

DM2 Thread diameter at the end point

APP Start distance from job zero

TDEP Height of thread(thread depth)

FAL Finishing allowance

IANG Infeed angle

NSP Staring point offset for the first thread

NRC Number of roughing cuts

NID Number of idle passes

VARI Machining type (range value:1….4)

NUMT Number of threads starts


PROCEDURE:

The given geometry is studied and a part program is written using G-Codes and M-Codes.







Using AUTO and CYCLE START buttons the program is executed and actual machining is done

on the given work piece

Result: Thus the manual part program was written to the given dimensions and executed in CNC LATHE.

The part manufactured was inspected using Vernier Caliper and the results were tabulated as follows


Viva Voce

1. Describe machining efficiency factor for calculating cycle time?

2. State the applications of P and K type of carbide inserts?

3. What are the controls available in the cnc machine?

4. List any two advantages and disadvantages of CNC Machines?

5. Write the meaning of following codes:-

a) G03 b) G96 c) G00 d) G75


DRAWING


EX. No: Simulation And Machining Of Contour Milling Using

VMC Machine DATE:

AIM:

To write the manual part program to the given dimensions and execute in CNC milling


Size - mm X mm

Material-


Vernier Caliper

Plain vice

Hammer

End milling cutter dia 20mm

PROGRAM:

MAIN PROGRAM:


SUB PROGRAM;









Using AUTO and CYCLE START buttons the program is executed and actual machining is done on

the given work piece

Result: Thus the manual part program was written to the given dimensions and executed in CNC

MILLING. The part manufactured was inspected using Vernier Caliper and the results were tabulated as

follows:


Viva Voce

1. Compare VMC with turn mill centre on the basic of construction?

2. List the differences between NC and CNC system?

3. What is cutter radius compensation?

4. Define DNC?

5. List out the types of CNC machine?

6. Explain canned cycle?

7. What is dry run?


karpagam academy of higher education (under section 3 of

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