engt 122 – cad i chapter 5 – editing objects. selection sets most editing commands require...

ENGT 122 – CAD IENGT 122 – CAD IChapter 5 – Editing Chapter 5 – Editing

ObjectsObjects

Selection SetsSelection Sets

Most editing commands require objects to be selected in Most editing commands require objects to be selected in order to perform an operation.order to perform an operation.

Previously we used mouse picks & bounding box Previously we used mouse picks & bounding box selection (window and crossing). selection (window and crossing).

Several other key word options are available for Several other key word options are available for selection. These are the most useful ones:selection. These are the most useful ones:

LLast ast PPreviousreviousWPWPolygonolygonCPCPolygonolygon

ALLALLFFenceenceUndo


All selection options can be activated on-the-fly (in the All selection options can be activated on-the-fly (in the middle of a command).middle of a command).

At selection prompt, type option name or enter first letters At selection prompt, type option name or enter first letters shown capitalized in yellow.shown capitalized in yellow.

At selection prompt, enter At selection prompt, enter ?? to display selection options. to display selection options.

LLast ast PPreviousreviousWPWPolygonolygonCPCPolygonolygon

ALLALLFFenceenceUndo


LLastastSelects the most recently drawn object displayed on Selects the most recently drawn object displayed on

the screen. the screen. Only a single object can be selected by this method.Only a single object can be selected by this method.

PPreviousreviousSelects all objects from the most recent selection set.Selects all objects from the most recent selection set.

DEMO 1DEMO 1

Open Open Demo1.dwgDemo1.dwg..Demonstrate selection Demonstrate selection

LLast – ast – create centered construction line to move create centered construction line to move bottom threaded hole. Use bottom threaded hole. Use LLast ast to erase to erase construction line.construction line.

PPrevious – revious – move bottom threaded hole to right move bottom threaded hole to right edge of part. Use edge of part. Use PPrevious revious to rotate hole into to rotate hole into horizontal position.horizontal position.

Exercise 1Exercise 1Open a new drawing file using Imperial Units .Open a new drawing file using Imperial Units .Draw the 3 objects shown in Draw the 3 objects shown in AA in the order specified (1 first). in the order specified (1 first).Use MOVE with the Use MOVE with the LLast ast option to rearrange option to rearrange circle 3circle 3 as shown as shown

in in BB..

12

3

2

3

1

2

1

3

A B

D

2

C

1

3

Use MOVE with Use MOVE with window selection to window selection to rearrange rearrange circle 3circle 3 and and line 1line 1 as shown in as shown in CC..

Use MOVE with Use MOVE with PPreviousrevious option to option to rearrange rearrange circle 3circle 3 and and line 1line 1 as shown in as shown in DD..

Save your drawing as Save your drawing as Exerc1.dwgExerc1.dwg..


WPWPolygon olygon (window polygon)(window polygon)Works like window selection Works like window selection

but uses an irregular polygon. but uses an irregular polygon. Only selects what’s completely Only selects what’s completely

enclosed in polygon.enclosed in polygon.

CPCPolygon olygon (crossing polygon)(crossing polygon)Same as Same as WPWPolygonolygon, except , except

also selects objects partially also selects objects partially enclosed in polygon (similar to enclosed in polygon (similar to Crossing Window). Crossing Window).

DEMO 2DEMO 2


WPWPolygon – olygon – copy entire front view without copy entire front view without dimensions. dimensions.

CPCPolygon – olygon – delete all dimensions in side view. delete all dimensions in side view.

Exercise 2Exercise 2If not already up, open If not already up, open Exerc1.dwgExerc1.dwg. It should look like . It should look like AA below. below.Use MOVE with the Use MOVE with the CPCPolygon olygon option to rearrange option to rearrange circle 3circle 3 and and

line 1line 1 as shown in as shown in BB..Use multiple MOVEs Use multiple MOVEs

with the with the WPWPolygon olygon option to rearrange option to rearrange circle 3circle 3 and and line 1line 1 as as shown in shown in CC..

12

3

2

1

3

C

A

2

B

1

3


ALLALLSelects all objects on “thawed” layersSelects all objects on “thawed” layersEven objects on layers with visibility turned off will be Even objects on layers with visibility turned off will be

selected. Only objects on “frozen” layers will not be selected. Only objects on “frozen” layers will not be selected.selected.

FFenceenceUses an open polyline Uses an open polyline

to select objects.to select objects.All objects which the All objects which the

polyline contacts will polyline contacts will be selected.be selected.

DEMO 3DEMO 3


FFence – ence – select and delete all dimensions select and delete all dimensions around front view.around front view.

Exercise 4Exercise 4

Create the pattern of rectangles and circle approximately Create the pattern of rectangles and circle approximately as shown. as shown.

Use Use ERASEERASE with the with the FFenceence option to delete only the option to delete only the rectangles.rectangles.


UndoRemoves the most recently selected object from the Removes the most recently selected object from the

selection set.selection set.You can also unselect an item by holding You can also unselect an item by holding [Shift][Shift] and and

reselecting it using single pick, window option, or reselecting it using single pick, window option, or crossing option.crossing option.

??Displays the various selection options on the command Displays the various selection options on the command

line (just in case you forget).line (just in case you forget).

End Lesson 19End Lesson 19

Modify CommandsModify Commands

Modify commands are used to eidt objects. They include the following list.

Modify commands can be entered in 3 ways;Type the command or abbreviation.Type the command or abbreviation.Use the Use the ModifyModify drop down menu. drop down menu.Use the Use the ModifyModify toolbar. toolbar.

MOVECOPYOFFSETROTATESCALEFILLET

CHAMFERTRIMEXTENDSTRETCHLENGTHEN

ARRAYMIRRORBREAKMEASUREDIVIDE

Editing CommandsEditing CommandsCOPY

Creates a copy of an object.Creates a copy of an object.Identical to the Identical to the MOVEMOVE command except the original command except the original

object is retained.object is retained.In 2007, creatingIn 2007, creating MULTIPLE MULTIPLE copies is the default. Use copies is the default. Use

[Esc] or [Enter] to end command.[Esc] or [Enter] to end command.

DEMO 5DEMO 5

Open Open Edit Demo.dwgEdit Demo.dwg..Show Copy command.Show Copy command.

Exercise 5Exercise 5Create the blue square as shown. Create the blue square as shown. Then use the Then use the leastleast number of number of COPY commands to add the commands to add the

red and green squares (use object snap for precise red and green squares (use object snap for precise placement on corner points).placement on corner points).

Editing CommandsEditing CommandsOFFSET

Offsets an object Offsets an object perpendicularperpendicular to original object by a to original object by a specified distance or through a specified point.specified distance or through a specified point.

Result depends on object being offset (arc, line, Result depends on object being offset (arc, line, rectangle etc).rectangle etc).

Primary Options:Primary Options: DistanceDistance (default) - offset (default) - offset

distance specified by offset distance specified by offset value or point selection.value or point selection.

ThroughThrough - offsets through - offsets through specified point.specified point.

Editing CommandsEditing Commands

OFFSET

Additional Options:Additional Options:EraseErase – Erase option allows original object to be – Erase option allows original object to be

maintained or erased. maintained or erased.

Layer Layer – determines whether new offset object is placed – determines whether new offset object is placed on current layer or same layer as original object.on current layer or same layer as original object.

DEMO 6DEMO 6

Open Open Edit Demo.dwgEdit Demo.dwg..Show Show OFFSETOFFSET command with options command with options

Exercise 6Exercise 6Create the three object as shown in Create the three object as shown in AA..Use Use OFFSET to create the image in to create the image in BB. . Estimate the proper offset distance for the concentric circles.Estimate the proper offset distance for the concentric circles.Note:Note: the red line is offset the red line is offset throughthrough the center of the circle and the center of the circle and

the corner point of the rectangle.the corner point of the rectangle.

A B

Editing CommandsEditing CommandsROTATE

Rotates objects through a specified angle about a Rotates objects through a specified angle about a specified base point (center of rotation).specified base point (center of rotation).

Positive angle = Positive angle = ; Negative angle = ; Negative angle =

Command:Command: ROTATEROTATESelect objects to rotate.Select objects to rotate.Select Base Point.Select Base Point.Specify rotation angle.Specify rotation angle.

The The REFERENCEREFERENCE option option can be used to designate a can be used to designate a reference line on object and reference line on object and rotate to an absolute angle.rotate to an absolute angle.

DEMO 7DEMO 7

Open Open Edit Demo.dwgEdit Demo.dwg..Show Show ROTATEROTATE command. command.Show Show ROTATEROTATE command with command with REFERENCEREFERENCE

option.option.Show Show ROTATEROTATE command with command with COPYCOPY option. option.


Create a 5 sided polygon and a line as shown Create a 5 sided polygon and a line as shown in in AA. Use object snap or other means for . Use object snap or other means for precise placement.precise placement.

Rotate both the line and polygon 23Rotate both the line and polygon 23ºº as as shown in shown in BB..

Use the Use the REFERENCEREFERENCE option to rotate just the option to rotate just the line so it aligns with the edge of the polygon line so it aligns with the edge of the polygon as shown in as shown in CC..

Use the Use the REFERENCEREFERENCE option to rotate both option to rotate both the line & polygon to the position shown in the line & polygon to the position shown in DD..

A

B

23°

C

D

Editing CommandsEditing CommandsSCALE

Scales the size of an object by a specified multiplying Scales the size of an object by a specified multiplying factor about a specified point.factor about a specified point.

Useful for scaling title block to fit drawing prior to plotting.Useful for scaling title block to fit drawing prior to plotting.Command:Command: SCALESCALE

Select objects to scale.Select objects to scale.Select Base Point.Select Base Point.Specify scale factor.Specify scale factor.

The The REFERENCEREFERENCE option option can be used to designate a can be used to designate a reference line on object and reference line on object and reduce or enlarge it to a reduce or enlarge it to a specified length.specified length.

Editing CommandsEditing CommandsSCALE - Example showing Example showing REFERENCEREFERENCE option.option.

After selecting base point, enter After selecting base point, enter RR for reference option. for reference option.Specify 2 points on object – you then specify the actual Specify 2 points on object – you then specify the actual

length you want these points to become.length you want these points to become.

Specify points

Specify length of 1 rather than scale factor


IMPORTANT: All drawing objects must be created full size in All drawing objects must be created full size in

AutoCAD! AutoCAD! Never use the Never use the SCALESCALE command to reduce an command to reduce an

object so it fits the plotted sheet!object so it fits the plotted sheet!Plot scaling is the correct method for fitting your Plot scaling is the correct method for fitting your

full size object on an itsy-bitsy piece of paper!full size object on an itsy-bitsy piece of paper!

DEMO 8DEMO 8

Open Open Edit Demo.dwgEdit Demo.dwg. . Show Show SCALESCALE command. command.Show Show SCALESCALE command with command with REFERENCEREFERENCE

option.option.

Exercise 7.5Exercise 7.5Use polar tracking and the Use polar tracking and the RECRECTANGLETANGLE command to create command to create

a square with a 3” diagonal as shown in red.a square with a 3” diagonal as shown in red.

3” d

iagon

alThen use object tracking and osnaps to Then use object tracking and osnaps to

create the inscribed circle shown in blue.create the inscribed circle shown in blue.Use the Use the SCSCALEALE command to double the command to double the

size of both objects.size of both objects.Then, use the Then, use the SCSCALEALE command with the command with the

REFERENCEREFERENCE option to rescale only the option to rescale only the square so the square has 2 inch sides and square so the square has 2 inch sides and remains centered in the circle.remains centered in the circle.

Finally, use the Finally, use the SCSCALEALE command with the command with the REFERENCEREFERENCE option option to rescale the circle so that it is to rescale the circle so that it is inscribedinscribed within the square. within the square.

Use the Use the DISTDIST command to verify the height of the square. command to verify the height of the square.

Editing CommandsEditing CommandsFILLET

Creates a tangent arc between 2 objects. Called a Creates a tangent arc between 2 objects. Called a FilletFillet (interior corner) or a (interior corner) or a RoundRound (exterior corner). (exterior corner).

Command:Command: FILLETFILLETSelect 1Select 1stst object. object.Select 2Select 2ndnd object. object.

Options:Options:Radius Radius – specify fillet radius – specify fillet radius (value retained until modified).(value retained until modified).Trim Trim – determines whether – determines whether original objects are modified original objects are modified (trim/extend) or left intact. (trim/extend) or left intact. Polyline Polyline –– fillets a polyline.fillets a polyline.MultipleMultiple – allows multiple fillets – allows multiple fillets

Notice the Notice the lines extendlines extend


FILLETTRIMTRIM option controls whether filleted objects remain intact or option controls whether filleted objects remain intact or

are trimmed and extended to form the fillet.are trimmed and extended to form the fillet.NO TRIMNO TRIM - selected objects remain unaltered and a fillet is - selected objects remain unaltered and a fillet is

added.added. TRIMTRIM – selected objects are cut or extended to form fillet. – selected objects are cut or extended to form fillet.

Original Objects Trim OnNo Trim


Works for arcs and circles as well as straight lines.Works for arcs and circles as well as straight lines.Point selection is also important for these cases.Point selection is also important for these cases.If a circle is included it remains untrimmed.If a circle is included it remains untrimmed.


Also useful for capping parallel Also useful for capping parallel lines. Radius is automatically lines. Radius is automatically calculated based on line calculated based on line separation and overrides the set separation and overrides the set radius value.radius value.

Can also be used to clean up Can also be used to clean up intersecting lines and create intersecting lines and create sharp corners by specifying a sharp corners by specifying a radius of zero.radius of zero.

A zero radius fillet can be made A zero radius fillet can be made (regardless of radius setting) by (regardless of radius setting) by depressing depressing [Shift][Shift] during object during object selection.selection.

Before

After

Radius = 0

DEMO 9DEMO 9

Open Open Edit Demo.dwgEdit Demo.dwg..Show Show FILLETFILLET command. command.Show following options:Show following options:

RadiusRadiusTrimTrimRadius = 0 using [Shift]Radius = 0 using [Shift]Cap parallel linesCap parallel linesShow Polyline optionShow Polyline option


Create 4 sets of lines as Create 4 sets of lines as shown in shown in AA. Use ortho, polar, . Use ortho, polar, or other means to assure they or other means to assure they are parallel or perpenducular.are parallel or perpenducular.

Then use Then use FILLETFILLET to modify to modify the line sets as shown in the line sets as shown in BB..

A

B

Editing CommandsEditing CommandsCHAMFER

Similar to Fillet but creates a Similar to Fillet but creates a ChamferChamfer - an angled corner or - an angled corner or bevel between 2 objects. bevel between 2 objects.

Does not work on circles, arcs, curves or parallel lines.Does not work on circles, arcs, curves or parallel lines.

May be specified by distance along each edge or May be specified by distance along each edge or distance along one edge and chamfer angle.distance along one edge and chamfer angle.


CHAMFERCommand:Command: CHAMFERCHAMFER

Select 1Select 1stst object. object.Select 2Select 2ndnd object. object.

Options:Options:Distances- Distances- specify chamfer distance from corner along 1specify chamfer distance from corner along 1stst edge. Specify chamfer distance from corner along 2edge. Specify chamfer distance from corner along 2ndnd edge. edge. Angle-Angle- specify chamfer distance from corner along 1st line. specify chamfer distance from corner along 1st line. Then specify chamfer angle with respect to first edge.Then specify chamfer angle with respect to first edge.Polyline-Polyline- chamfers a polyline. chamfers a polyline.Trim-Trim- determines whether objects are trimmed or left intact. determines whether objects are trimmed or left intact.MethodMethod – Determines default method (Distance or Angle). – Determines default method (Distance or Angle).

DEMO 10DEMO 10

Open Open Edit Demo.dwgEdit Demo.dwg..Show Show CHAMFERCHAMFER command. command.Show the following option:Show the following option:

DistancesDistancesAngleAngle


Draw the red object Draw the red object shown in shown in AA. .

Then use Then use CHACHAMFERMFER to modify the object to modify the object as shown in as shown in BB..

3.0

6.0

1.0

3.0

1.0

0.5

0.51.0

30°

30°

0.5

0.5

2X 45°x.25 CHAM

A

B

Exercise 9 - Alt Exercise 9 - Alt

Create 2 sets of lines as Create 2 sets of lines as shown in shown in AA. Use ortho or . Use ortho or other means to assure other means to assure they are perpendicular.they are perpendicular.

Then use CHAMFER to Then use CHAMFER to modify the line sets as modify the line sets as shown in shown in BB..

B

1.0

30°

1.0

0.5

A

Editing CommandsEditing CommandsTRIM

Cuts & removes (Trims) portion of an object that extends Cuts & removes (Trims) portion of an object that extends beyond intersection with another object (trim boundary).beyond intersection with another object (trim boundary).

More than one cutting edge (trim boundary) can be selected.More than one cutting edge (trim boundary) can be selected.More than one object can be trimmed at a time.More than one object can be trimmed at a time.

Command:Command: TRIMTRIMSelect trim boundaries.Select trim boundaries.Select objects to trim.Select objects to trim.

1) Select trim boundary

2) Select object to trim

Result

Remove


TRIM

Additional options:Additional options:Fence – Fence – selects objects to trim using selection Fence.selects objects to trim using selection Fence.Crossing – Crossing – selects objects to trim using selection crossing selects objects to trim using selection crossing

box. This is the default, so no need for this option.box. This is the default, so no need for this option.Project –Project – only used for 3D. only used for 3D.Edge –Edge – activates & deactivates implied intersections. activates & deactivates implied intersections.Erase – Erase – erases selected objects in the middle of the trim erases selected objects in the middle of the trim

command. command. Undo – Undo – removes effect of most recent trim.removes effect of most recent trim.

Editing CommandsEditing CommandsTRIMEdgeEdge option defaults to option defaults to ExtendExtend

which allows implied which allows implied intersection. If deactivated with intersection. If deactivated with NOextendNOextend, only true , only true intersections are considered. intersections are considered.

Selection point determines Selection point determines which portion is trimmed.which portion is trimmed.

More than one trim boundary More than one trim boundary or trim object may be selected.or trim object may be selected.

An object may be a trim An object may be a trim boundary and a trimmed object boundary and a trimmed object simultaneously.simultaneously.

1st pick cutting edge

2nd picktrim edge

result

1st pick cutting edge

result

1st pick2 cutting edges

2nd pick2 trim edges

result

2nd picktrim edge

Editing CommandsEditing CommandsTRIM

Depressing Depressing [Shift][Shift] while selecting the trim object extends the while selecting the trim object extends the object to the trim boundary rather than trimming it. Discussed object to the trim boundary rather than trimming it. Discussed further during next command further during next command EXTENDEXTEND..

1) Select trim boundary

2) Hold [Shift] & Select object to extend

Result

DEMO 11DEMO 11

Create some objects.Create some objects.Show Show TRIMTRIM command. command.Show the following option:Show the following option:

Multiple trim objects and trim boundaries.Multiple trim objects and trim boundaries.Show use of ALL objects as trim Show use of ALL objects as trim

boundaries.boundaries.Use of Use of [Shift][Shift] to extend line. to extend line.


Create a circle, rectangle, and Create a circle, rectangle, and line as shown in line as shown in AA. .

Then use Then use TRIMTRIM to create the to create the image as shown in image as shown in BB..

Then use Then use TRIMTRIM again to create again to create the image as shown in the image as shown in CC..

Finally, use Finally, use TRIMTRIM with with [Shift][Shift] to to reconnect the red line.reconnect the red line.

A

B

C

Editing CommandsEditing CommandsEXTENDOpposite of TRIM. Extends or lengthens object to a specified Opposite of TRIM. Extends or lengthens object to a specified

object (extend boundary).object (extend boundary).Operates in same manner as TRIM.Operates in same manner as TRIM.Depressing Depressing [Shift][Shift] while selecting the extend object trims the while selecting the extend object trims the

object rather than extending it.object rather than extending it.

Command:Command: EXTENDEXTENDSelect extend boundaries.Select extend boundaries.Select objects to extend.Select objects to extend.


EXTEND

Additional options:Additional options:Fence – Fence – selects objects to trim using selection Fence.selects objects to trim using selection Fence.Crossing – Crossing – selects objects to trim using selection crossing selects objects to trim using selection crossing

box. This is the default, so no need for option.box. This is the default, so no need for option.Project –Project – only used for 3D. only used for 3D.Edge –Edge – activates & deactivates implied intersections. activates & deactivates implied intersections.Undo – Undo – removes effect of most recent trim.removes effect of most recent trim.

Editing CommandsEditing CommandsSTRETCH

Used to stretch, lengthen, shorten, or modify an Used to stretch, lengthen, shorten, or modify an object’s boundaries.object’s boundaries.

Requires selection by Requires selection by Crossing WindowCrossing Window or or Crossing Crossing PolygonPolygon (CP). (CP).

Command:Command: STRETCHSTRETCHSelect objects.Select objects.Specify basepoint.Specify basepoint.Specify second point Specify second point

of displacement by of displacement by pick or coordinates.pick or coordinates.

DEMO 12DEMO 12

Open Open Edit Demo.dwgEdit Demo.dwg..Show Show STRETCHSTRETCH command. command.Show Show STRETCHSTRETCH to lengthen centerlines. to lengthen centerlines.


Create 2 rectangles as shown in Create 2 rectangles as shown in AA. . Then use Then use STRETCHSTRETCH to create the to create the

image as shown in image as shown in BB..Then use Then use STRETCHSTRETCH again to again to

create the image as shown in create the image as shown in CC..

A

B

C


LENGTHENLengthens or shortens an open object by a specified amount.Lengthens or shortens an open object by a specified amount.Object selection point determines which end changes size.Object selection point determines which end changes size.Does not operate on closed loops.Does not operate on closed loops.

Command:Command: LENGTHENLENGTHENSelect object or specify method for lengthening.Select object or specify method for lengthening.If object is selected first, ACAD returns the length and If object is selected first, ACAD returns the length and

prompts for lengthening method.prompts for lengthening method.


Lengthen Options:Lengthen Options:DElta-DElta- used to specify length change in any open used to specify length change in any open object or change in included angle (+/-) of arcs.object or change in included angle (+/-) of arcs.Percent-Percent- specify % change based on original size of specify % change based on original size of 100%. 100%. Total- Total- specify new total length of any open objectspecify new total length of any open object or or total angle for arcs. Total can be specified by value or total angle for arcs. Total can be specified by value or point selection.point selection.DYnamic- DYnamic- change length by dragging.change length by dragging.

DEMO 13DEMO 13

Create some objects.Create some objects.Show Show LENGTHENLENGTHEN command. command.Options:Options:

DEltaDEltaPercentPercentTotalTotalDYnamicDYnamic


ARRAYCreates multiple duplicate Creates multiple duplicate

objects in a rectangular or objects in a rectangular or circular pattern.circular pattern.

Command:Command: ARRAYARRAYBrings up array dialog box.Brings up array dialog box.

Circular Array

Rectangular Array

Editing CommandsEditing CommandsARRAY - RECTANGULAR

Select items for arraySelect items for arraySpecify # of row and Specify # of row and

columns.columns.Specify the row offset.Specify the row offset.Specify the column offset.Specify the column offset.Specify array angle.Specify array angle.

Editing CommandsEditing CommandsARRAY - POLAR

Select items for arraySelect items for arraySpecify array center point.Specify array center point.Specify method:Specify method:• Total items & total fill Total items & total fill • Total items & Total items & between items between items• Total fill Total fill & & between items between itemsSpecify whether items rotate.Specify whether items rotate.Specify base point or default.Specify base point or default.

DEMO 14DEMO 14

Create a rectangle.Create a rectangle.Show Show ARRAYARRAY command. command.Options:Options:

RectangularRectangularPolar Polar (first create circle for guide)(first create circle for guide)


Create the following two array patterns.Create the following two array patterns.


MIRRORCreates a mirrored image of selected object. Creates a mirrored image of selected object. Original object may be erased or retained.Original object may be erased or retained.

Command:Command: MIRRORMIRRORSpecify mirror object.Specify mirror object.Specify mirror line by Specify mirror line by

end point picks or end point picks or coordinate input.coordinate input.

Specify whether Specify whether original is deleted.original is deleted.

DEMO 15DEMO 15

Create some objects.Create some objects.Show Show MIRRORMIRROR command. command.


Create the arc and lines as in Create the arc and lines as in AA..Then using only the Then using only the MIRRORMIRROR command, create command, create

the image in the image in BB..

Figure AFigure A Figure BFigure B

Editing CommandsEditing CommandsBREAK

Cuts an object into two parts or Cuts an object into two parts or removes portion of object.removes portion of object.

Command:Command: BREAKBREAKSpecify object to break.Specify object to break.Specify break method.Specify break method.

Break Methods:Break Methods:2 Point2 Point – Breaks object between 2 points and removes – Breaks object between 2 points and removes

section between them.section between them.

1 Point1 Point – Breaks object at a single point and retains both – Breaks object at a single point and retains both pieces.pieces.


Approx. Break MethodsApprox. Break Methods::

Command: BreakSelect object: select objectSpecify second break point or [First point]: @

Approx. 2 PointApprox. 2 Point - - object selection point object selection point is 1is 1stst break point, then break point, then select 2select 2ndnd break point break point (portion between (portion between points removed).points removed).

Approx. 1 PointApprox. 1 Point – – object selection object selection point is break point is break point.point.

Command: BreakSelect object: select objectSpecify second break point or [First point]: pick point

Object select point is break point.

Object select point is 1st break point.2nd break point.

*Note – osnap not available during object selection.


Precise Break MethodsPrecise Break Methods::

Command: BreakSelect object: select objectSpecify second break point or [First point]: FSpecify first break point: pick pointSpecify second break point: @

2 Point Break: 2 Point Break: select object, then select object, then select 1select 1stst and 2 and 2ndnd break points break points (portion between (portion between points removed).points removed).

1 Point Break:1 Point Break: select object, then select object, then select break point.select break point.

Command: BreakSelect object: select objectSpecify second break point or [First point]: FSpecify first break point: pick pointSpecify second break point: pick point

Object select point.1st & 2nd break points.

2nd break point.1st break point.

Object select point.


BREAKFor circles, the break removal will be counter clockwise For circles, the break removal will be counter clockwise

from first to second selection point.from first to second selection point.A circle cannot be broken at a single point (would form A circle cannot be broken at a single point (would form

360360˚ arc which is illegal).˚ arc which is illegal).

DEMO 16DEMO 16

Create some lines and circles.Create some lines and circles.Show Show BREAKBREAK command. command.

1 Point1 Point1 Point Select1 Point Select2 Point2 Point2 Point Select2 Point SelectCircleCircle

Exercise 14Exercise 14Create the rectangle, circle, and lines as in Create the rectangle, circle, and lines as in AA..Use only the Use only the BRBREAKEAK command to create the image in command to create the image in BB. .

Use layer colors to keep track of the breaks as shown. Use layer colors to keep track of the breaks as shown.

Figure AFigure A Figure BFigure B

A B

Break at quadrants

Break at midpoint


MEASUREPlaces point entities at specified distances along an object.Places point entities at specified distances along an object.

Command:Command: MEASUREMEASURESpecify object.Specify object.Specify length between points Specify length between points

by value or point selection.by value or point selection.

Point shape and size determined Point shape and size determined by by FormatFormat > > Point StylePoint Style

Object selection point


MEASURE

Object selection point

For open objects, points start For open objects, points start

closest to end where object closest to end where object was selected.was selected.

For closed polylines, points For closed polylines, points start at polyline start point.start at polyline start point.

For circles, points start at For circles, points start at snap rotation anglesnap rotation angle (typically 0 (typically 0) ) and precede counter clockwise. To reset snap rotation use and precede counter clockwise. To reset snap rotation use SNAPSNAP command from command line with command from command line with RotateRotate option. option. Warning: the Warning: the RR option won’t appear in command at 2007!) option won’t appear in command at 2007!)


MEASURE

MEASUREMEASURE is not available from a is not available from a toolbar, but can be initiated from the toolbar, but can be initiated from the Draw Drop Down Menu.Draw Drop Down Menu.DDMenu: DDMenu: DrawDraw > > PointPoint > > MeasureMeasure

DEMO 17DEMO 17

Create a line and circle.Create a line and circle.Show Show MEASUREMEASURE command. command.

LineLineCircleCirclePoint StylePoint Style

Editing CommandsEditing CommandsDIVIDE

Divides an object into specified number of equal segments Divides an object into specified number of equal segments without breaking. Point entities indicate divisions.without breaking. Point entities indicate divisions.

Command:Command: DIVIDEDIVIDESpecify object.Specify object.Specify number of segments.Specify number of segments.

Point shape and size determined Point shape and size determined by by FormatFormat > > Point StylePoint Style


DIVIDE

For open objects, points start For open objects, points start

closest to end where object closest to end where object was selected.was selected.

For closed polylines, points For closed polylines, points start at polyline start point.start at polyline start point.

For circles, points start at For circles, points start at snap rotation anglesnap rotation angle (typically 0 (typically 0) ) and precede counter clockwise. To reset snap rotation use and precede counter clockwise. To reset snap rotation use SNAPSNAP command from command line with command from command line with RotateRotate option. option. Warning: the Warning: the RR option won’t appear in command at 2007!) option won’t appear in command at 2007!)


DIVIDE

DIVIDEDIVIDE is not available from a toolbar, is not available from a toolbar, but can be initiated from the Draw but can be initiated from the Draw Drop Down Menu.Drop Down Menu.DDMenu: DDMenu: DrawDraw > > PointPoint > > DivideDivide

DEMO 18DEMO 18

Create a line and circle.Create a line and circle.Show Show DIVIDEDIVIDE command. command.

LineLineCircleCircle

Exercise 15Exercise 15Use Use POLYGONPOLYGON to create the yellow to create the yellow in in AA..Use Use DIVIDEDIVIDE to divide the yellow to divide the yellow into 9 equal lengths. into 9 equal lengths.Use Use POLYGONPOLYGON with with EdgeEdge option to create the blue option to create the blue in in AA..Move the blue Move the blue to location shown in to location shown in BB..Use Use COPYCOPY to create image to create image CC..All locations should be exact! Use OSNAP!All locations should be exact! Use OSNAP!

CA B

Chapter 5 – The End!Chapter 5 – The End!

RETIRED RETIRED MATERIALMATERIAL

Selection SetsSelection SetsRRemoveemove

Allows objects to be removed from the selected set.Allows objects to be removed from the selected set.Activates selection Activates selection Remove ModeRemove Mode. . Once activated, objects can be selected for removal from Once activated, objects can be selected for removal from

the set by any selection method.the set by any selection method.Remove ModeRemove Mode remains active until the remains active until the AAdddd option is option is

activated to add objects back to the selected set.activated to add objects back to the selected set.Alternate remove method –hold Alternate remove method –hold

[Shift][Shift] during object selection. during object selection. AAdddd

Toggles back to default Toggles back to default Add Add

ModeMode so objects can be added to so objects can be added to

selected set.selected set.

DEMO 3DEMO 3


RRemoveemove – – select all objects surrounding hole select all objects surrounding hole in side view. Use in side view. Use RRemoveemove to remove all object to remove all object lines from selection and then erase hole.lines from selection and then erase hole.

AAdd dd – – show use of show use of AAdddd to add to selection to add to selection set.set.

Exercise 3Exercise 3Draw two concentric circles and a circumscribed square as Draw two concentric circles and a circumscribed square as

shown in shown in (1)(1). . Select all objects for erasure, but don’t execute yet.Select all objects for erasure, but don’t execute yet.Use Use RRemoveemove option to remove the square and outer circle option to remove the square and outer circle

from the selected set.from the selected set.Use the Use the AAdd dd option to option to

add the outer circle add the outer circle back to the selected back to the selected set.set.

Execute the erase Execute the erase command to delete command to delete both circles both circles (3)(3)..


Copy Using Shortcut Menu:Select objects, then right Select objects, then right

click mouse to show shortcut click mouse to show shortcut menu.menu.

Allows copy & paste options Allows copy & paste options similar to MS Windows.similar to MS Windows.

Select Select CopyCopy to place copy of to place copy of object in buffer.object in buffer.

Select Select PastePaste to paste object to paste object from buffer.from buffer.

Copy with Base PointCopy with Base Point allows allows insertion point to be selected insertion point to be selected for better control. for better control.

DEMO 5DEMO 5

Open Open Edit Demo.dwgEdit Demo.dwg..Show Copy command access from menus.Show Copy command access from menus.Demonstrate Demonstrate COPYCOPY command command..Demonstrate Demonstrate COPY WITH BASECOPY WITH BASE shortcut menu. shortcut menu.

Exercise 5Exercise 5Create the blue square as shown. Create the blue square as shown. Use Use COPY to add the red squares using the blue square as to add the red squares using the blue square as

the original (use object snap for precise placement on the original (use object snap for precise placement on corner points).corner points).

Use Use Copy with Base PointCopy with Base Point (from shortcut menu) to create (from shortcut menu) to create the remaining green squares. the remaining green squares.

Editing CommandsEditing CommandsTRIMEdgeEdge option defaults to option defaults to ExtendExtend

which allows implied which allows implied intersection. If deactivated with intersection. If deactivated with NOextendNOextend, only true , only true intersections are considered. intersections are considered.

Selection point determines Selection point determines which portion is trimmed.which portion is trimmed.

More than one trim boundary More than one trim boundary or trim object may be selected.or trim object may be selected.

An object may be a trim An object may be a trim boundary and a trimmed object boundary and a trimmed object simultaneously.simultaneously.

Other Editing CommandsOther Editing Commands

Properties CommandAllows properties of an object to Allows properties of an object to

be modified.be modified.

Command:Command: PRPROPERTIESOPERTIESBrings up Properties Dialog box.Brings up Properties Dialog box.

Other Methods:Other Methods:Select object and right click for Select object and right click for

shortcut menu. Select properties.shortcut menu. Select properties.Toolbar menu (toggles on/off).Toolbar menu (toggles on/off).

DEMO 20DEMO 20

Show Show PROPERTIESPROPERTIES command command

Other Editing CommandsOther Editing Commands

Matching PropertiesProperties of objects can be transferred from object to object.Properties of objects can be transferred from object to object.Such properties include;Such properties include;

Command:Command: MATCHPROPMATCHPROPSpecify source object.Specify source object.Specify destination object or select Specify destination object or select SettingsSettings option to option to

determine which properties get transferred.determine which properties get transferred.

Color Layer Linetype Linetype scale Line weight

DEMO 19DEMO 19

Show Show MATCHPROPMATCHPROP command commandTo match layer propertiesTo match layer propertiesTo match linetype scaleTo match linetype scale

Exercise 16Exercise 16 Set up the following layers: Set up the following layers:

Layer 1 - White - Continuous linesLayer 1 - White - Continuous linesLayer 2 - Red - Hidden linesLayer 2 - Red - Hidden linesLayer 3 - Yellow - CenterlinesLayer 3 - Yellow - Centerlines

Use Layer 1 to create the objects in Use Layer 1 to create the objects in AA. Then use any form . Then use any form of the of the PROPERTIESPROPERTIES command to individually change the command to individually change the properties for each object as shown in properties for each object as shown in BB. Finally, use the . Finally, use the MATCHPROPMATCHPROP command to create the image in command to create the image in CC. .

Figure AFigure A Figure BFigure B Figure CFigure C

engt 122 – cad i chapter 5 – editing objects. selection sets most editing commands require...

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