Chapter 13 AutoCAD

PREPARED BY BVSR KISHORE

AutoCAD Tutorial(introductory level)


1. Working environment : Drawing area, Menus, Tools bars, Buttons.

2. Interaction: How to execute a command.

4. Drawing a shape: Commands & Tools (i.e. Ortho mode (F8), object snap (F3))

5. Modifying a shape: Commands

6. Dimensioning: Commands

7. Plotting

3. Preparation: Format a layer and dimension style.

Topics

1. Introduction

2. Create a drawing

3. Print a drawing


1. Workingenvironment


Start the program

1

2


Screen

6. Layer

7. Property

1. Standard

2. Draw3. Modify4. Object snap

5. Dimension

Menu bar

Status line

Command line

Drawing area


Customizing a BackgroundMenu bar:

1. Click “Tool” >> “Options”

Options:

2. Click “Display”

3. Click “Colors…”

Drawing Window Colors:

4. Click “2D model space”

5. Click “Uniform background”

6. Click “Color” (select your prefer

color.)

2

3

4 5 6


Commonly used toolbars

1. Standard

2. Draw

3. Modify

4. Object snap

5. Dimension

6. Layer

7. Properties

Geometricconstruction


1. Standard

1

1. File (New; Open; Save)

2. Plot

3. Undo (Redo button is placed on the right)

5. Zoom

2 3 5

With a mouse scroll wheel

- Rolling forward to “Zoom in”

- Rolling backward to “Zoom out”

4

4. Pan


2. Draw

1 2 3 4 5 6

1. Line

2. Polyline

3. Polygon

4. Rectangle

5. Arc

6. Circle

7 8

7. Hatching

8. Multiline text


3. Modify

1

1. Erase(same as clicking a “delete” button)

2. Copy selection

3. Mirror

4. Offset

5. Array

6. Move

7. Rotate

2 3 4 5 6 7 8 9

8. Trim

9. Extend

11 1210

10. Break at point

11. Chamfer

12. Round


4. Object snap

1 2 3 4 5 6

1. (Snap to) End point

2. Midpoint

3. Intersection

4. Center

5. Quadrant

6. Tangent

7 8

7. Perpendicular

8. Parallel


5. Dimension

1. Linear

2. Aligned

3. Radius

4. Diameter

5. Angular

6. Center mark

1 2 3 4 5 6


6. Layer

1

1. Click “Layer property manager”

On/Off

Lock/Unlock

Layername


7. Properties

Color Linetype Lineweight


Customizing a Toolbar

1. Right click on a toolbar area

2. Select “ACAD”

3. Click on a listed item to open (or close)

toolbar.

2

3


2. Interaction


Execute a command

1. Enter a “keyword or command” in a command line

2. Select from list in menu bar (or right click on

the drawing area to open a short cut menu)

3. Click the button on a toolbar


Method 1

Key in a “keyword” in a command line.

Executedcommand

Option/Properties

Example : Draw a circle

Follows a step-by-step option or guidance.


Method 2

Select a “keyword” from a list in menu bar.


Follows a step-by-step option or guidance in command line.

1

23

The current step that is displayed a command line is


Method 3

Click the button in a toolbar.


Follows a step-by-step option or guidance in command line.

Click .


3. Preparation


Format layer : Create a new layer

Create the layers for

visible line, thin line, hidden line, center line, dimension, hatching and text.

1. Menu bar: Click “Format” >> “Layer”

2. Click , Key in “Visible line”

3. Click , Key in “Thin line”

4. Click , Key in “Hidden line”

5. Click , Key in “Center line”

6. Click , Key in “Dimension”

7. Click , Key in “Hatching”

8. Click , Key in “Text”

9. Click “OK”

Exercise


Format layer : Setting a linetype 1/2

1. Menu bar: Click “Format” >> “Linetype”.

2. Click “Load”, Select “CENTER” and Click “OK”.

3. Click “Load”, Select “DASHED” and Click “OK”.

4. Click “OK”.

Exercise


Format layer : Setting a linetype 2/2

5. Open “Layer Properties manager”,Click “Linetype” of a layer “Center line”.

6. Click “CENTER”, click “OK”.

7. Click “Linetype” of a layer “Hidden line”

8. Click “DASHED”, click “OK”.

9. Click “OK”.

Exercise

56

7

8


Format layer : Setting a lineweight

Exercise

1. Open “Layer Properties manager”, Click “Lineweight” of a layer “Visible line”

2. Click “0.6 mm”, click “OK”.

3. Click “OK”.


Answer


Format dimension style 1/5

1. Menu bar: Click “Format” >> “Dimension style”

2. Click “Modify”.

Exercise

2


3. Click tab “Line”

4. Change “Dimension lines” and “Extension lines” to the following format.


Exercise

3


5. Click tab “Symbols and Arrows”

6. Change “Arrowheads” to the following format.


Exercise

5


7. Click tab “Text”

8. Change “Text style” and “Text color” to the following format.


Exercise

7

8


9. Click tab “Primary Units”

10. Change “Precision” and “Decimal separator” to the following format.

11. Click “OK”


Exercise

9


4. Drawing a shape


Notes

Meaning of symbols in AutoCAD command line.

• [ ] is used for option

• ( ) is used for explanation

• < > is used for default value

Location of a point can be assigned by

• mouse click on the drawing area or on a specific point of an object.

• key in a cartesian coordinate.

(two numbers separate by a comma, i.e. 50,27 )

• key in a polar coordinate

- distance (from a specified beginning point) and

- angle (CCW from the horizontal axis)

(i.e. @50<60)


Line

Command: line Specify first point: 0,0 Specify next point or [Undo]: 50,50 Specify next point or [Undo]: press ESC

Command: line Specify first point: 0,0 Specify next point or [Undo]: @50<45 Specify next point or [Undo]: press ESC

1

2

Sketch it

Class activity

Sketch it


Rectangle

Command: rectangleSpecify first corner point or [Chamfer/Elevation/Fillet/Thickness/Width]: 15,15Specify other corner point or [Area/Dimensions/Rotation]: @100,60

1

Sketch it

Class activity


Polygon

Command: polygonEnter number of sides <4>: 6Specify center of polygon or [Edge]: 60,60Enter an option [Inscribed in circle/ Circumscribed about circle] <I>: cSpecify radius of circle: 15

Sketch it1

Command: polygonEnter number of sides <4>: 6Specify center of polygon or [Edge]: 60,60Enter an option [Inscribed in circle/ Circumscribed about circle] <I>: iSpecify radius of circle: 15

Sketch it2

Class activity


CircleCommand: circle Specify center point for circle or [3P/2P/Ttr (tan tan radius)]: 50,50 Specify radius of circle or [Diameter] <10.0000>: 20

Command: circle Specify center point for circle or [3P/2P/Ttr (tan tan radius)]: 3p Specify first point on circle: 10,10 Specify second point on circle: 70,70Specify third point on circle: 50,30

1

2

Command: circle Specify center point for circle or [3P/2P/Ttr (tan tan radius)]: Ttr Specify point on object for first tangent of circle: [ the 1st line]Specify point on object for second tangent of circle:[ the 2nd line]Specify radius of circle <59.6074>: 40

3

Sketch it

Sketch it

Sketch it

Class activity


ArcCommand: arcSpecify start point of arc or [Center]: cSpecify center point of arc: 50,50Specify start point of arc: @30<0Specify end point of arc or [Angle/chord Length]: aSpecify included angle: 120

1

Command: arcSpecify start point of arc or [Center]: cSpecify center point of arc: 50,50Specify start point of arc: @30<30Specify end point of arc or [Angle/chord Length]: @50<120

2

Sketch it

Class activity

Sketch it


Hatch

Command: hatch1. Select pattern2. Set angle and scale.3. Click button “Add: Pick points”4. Click inside the closed area.5. Right click6. Click “OK”

Sketch it

1

2 2

3

Sketch it

6

Class activity


Ortho mode on/off

off

on

- If ortho mode is set on, all lines are drawn only along the x-y directions.

- Press [F8] to turn on or off object snap mode.


Object snap mode on/off

Status bar off

on

Right click

Press [F3] to turn on or off object snap mode.


5. Modifying a shape


MoveCommand: moveSelect objects: 1 foundSelect objects: (If finished, click mouse right button)Specify base point or [Displacement] <Displacement>: click on a point BSpecify second point or <use first point as displacement>: @50,30

Specify second point or <use first point as displacement>: 50,30

Specify second point or <use first point as displacement>: @50<30

1

2

3

Class activity

Sketch it Sketch it Sketch it

A

B

A

B

A

B


Copy selection

Class activity

Command: copySelect objects: 1 foundSelect objects: click mouse right buttonSpecify base point or [Displacement] <Displacement>: click on a point BSpecify second point or <use first point as displacement>: @50,30

1

Sketch it

A

B


MirrorCommand: mirrorSelect objects: Specify opposite corner: 4 foundSelect objects: (If finished, click mouse right button)Specify first point of mirror line: click on a point ASpecify second point of mirror line: click on a point BErase source objects? [Yes/No] <N>: n

1

Sketch it

Class activity

A

Bobject


Offset

1

Class activity

Command: offsetSpecify offset distance or [Through/Erase/Layer] <Through>: 30Select object to offset or [Exit/Undo] <Exit>: click on the objectSpecify point on side to offset or [Exit/Multiple/Undo] <Exit>: click on the drawing area

Sketch it Sketch it


Array

1

Class activity

Command: arrayArray dialog box will appear.1.Select type of an array Rectangular2.Input rows, columns, row offset, column offset, angle of array.3.Click button “Select object”.4. Click on an object.5. Right click.6. Click button “OK”

A B

CD

E

Sketch it

object


Array

2

Class activity

Command: arrayArray dialog box will appear.1.Select type of an array : Polar2.Input A and B.3.Click button “Select object”. 3.1 Click on an object. 3.2. Right click.

4. Click button “Center point” 4.1 Click on a center point. 4.2 Right click.

5. Select option “Rotate items as copied” or not

6. Click button “OK”

A

B

Sketch it

object


Rotate

1

Class activity

Command: rotateCurrent positive angle in UCS: ANGDIR=counterclockwise ANGBASE=0Select objects: 1 foundSelect objects: (If finished, click mouse right button)Specify base point: click on a point ASpecify rotation angle or [Copy/Reference] <0>: 30

A

Sketch it

A

Sketch it


Rotate

2

Class activity

Command: rotateCurrent positive angle in UCS: ANGDIR=counterclockwise ANGBASE=0Select objects: 1 foundSelect objects: (If finished, click mouse right button)Specify base point: click on a specific point on the objectSpecify rotation angle or [Copy/Reference] <0>: rSpecify the reference angle <196>: click on point CSpecify second point: click on point DSpecify the new angle or [Points] <0>: pSpecify first point: click on a point ASpecify second point: click on a point B

A

B

C D

Sketch itGiven


Trim

1

Class activity

Command: trimCurrent settings: Projection=UCS, Edge=NoneSelect cutting edges ...Select objects or <select all>: Click on line ABSelect objects: (If finished, click mouse right button)Select object to trim or shift-select to extend or[Fence/Crossing/Project/Edge/eRase/Undo]:Select object to trim or shift-select to extend or[Fence/Crossing/Project/Edge/eRase/Undo]: (If finished, click mouse right button)

A

B

Sketch itGiven


Extend

1

Class activity

Sketch it

A

B

C

D

Command: extendCurrent settings: Projection=UCS, Edge=NoneSelect boundary edges ...Select objects or <select all>: Click on line CDSelect objects: (If finished, click mouse right button)Select object to extend or shift-select to trim or[Fence/Crossing/Project/Edge/Undo]: Click on point A.Select object to extend or shift-select to trim or[Fence/Crossing/Project/Edge/Undo]: (If finished, click mouse right button)

Sketch it

A

B

C

D

EF


Break at point

Class activity

Sketch it Sketch it Sketch it


Chamfer

1

Class activity

Command: chamfer(TRIM mode) Current chamfer Dist1 = 0.0000, Dist2 = 0.0000Select first line or [Undo/Polyline/Distance/Angle/Trim/mEthod/Multiple]: dSpecify first chamfer distance <0.0000>: 5Specify second chamfer distance <5.0000>: 5Select first line or [Undo/Polyline/Distance/ Angle/Trim/mEthod/Multiple]: click on line ASelect second line or shift-select to apply corner: click on line B

A

B

Sketch it


Fillet

1

Class activity

Command: filletCurrent settings: Mode = TRIM, Radius = 0.0000Select first object or [Undo/Polyline/Radius/Trim/Multiple]: rSpecify fillet radius <0.0000>: 5Select first object or [Undo/Polyline/Radius/Trim/Multiple]: click on line ASelect second object or shift-select to apply corner: click on line B

A

B

Sketch it


6. Dimensioning


Linear

1. Click on the button2. Follows command lineSpecify first extension line origin or <select object>: Click on point ASpecify second extension line origin: Click on point BSpecify dimension line location or [Mtext/Text/Angle/Horizontal/Vertical/Rotated]: Move the crosshair to your prefer position

then click.

Sketch it Sketch it

A B A

B


Aligned

1. Click on the button2. Follows command lineSpecify first extension line origin or <select object>: Click on point ASpecify second extension line origin: Click on point BSpecify dimension line location or [Mtext/Text/Angle/Horizontal/Vertical/Rotated]: Move the crosshair to your prefer position

then click.

Sketch it

A

B


Angle

1. Click on the button2. Follows command lineSelect arc, circle, line, or <specify vertex>: Click on line ABSelect second line: Click on point ACSpecify dimension arc line location or [Mtext/Text/Angle]: Move the crosshair to your prefer position then click.

Sketch it

A

B

C


Radius

1. Click on the button2. Follows command lineSelect arc or circle: Click on arc ABSpecify dimension line location or [Mtext/Text/Angle]: Move the crosshair to your prefer position

then click.

Sketch it

A

B


Diameter

1. Click on the button2. Follows command lineSelect arc or circle: Click on circleSpecify dimension line location or [Mtext/Text/Angle]: Move the crosshair to your prefer position

then click.

Sketch it


Leader

1. Click on the button2. Follows command lineSpecify first leader point, or [Settings] <Settings>: click on center of a circleSpecify next point: Click for a bend pointSpecify next point: Push F8 if “ortho mode” is off.

<Ortho on> Click for an end point.

Specify text width <0.0000>: Right click (to skip)Enter first line of annotation text <Mtext>: Key in a textEnter next line of annotation text: Right click (to finish)3. Move the arrowhead to a circumferential line.

Sketch it


7. Plotting


Overall steps

1. Create layout (or paper space)

2. Placement and scaling an object.

3. Edit a title block

4. Plot


1. Create layout

1. Go to Menu bar, select

Insert >> layout >> layout from template2. Select “ISO A4 Named Plot Styles” and click “Open”.3. Click “OK” to close insert layout window.4. Click Tab “ISO A4 Title Block (portrait)”.

2

2

3

Exercise

4


Screen

Printableframe

(dash line)

Viewportframe

(continuous line)

Template

Object

NOTES

1. To zoom and pan the object,

double click on viewport area. (To activate a “floating model space”)

2. To return to a paper space

double click on outside

viewport area.

Demonstration


2. Placement and scaling 1/2

1. Activate a floating model

space.

2. In command line, key in

“zoom” [press ENTER],

“extents” [press ENTER].

3. Return to paper space.

Exercise


2. Placement and scaling 2/2

1. Go to menu bar, click

Modify >> Properties

2. Click on viewport frame.

3. Go to properties window,

select “viewport (1)”

4. Select an appropriate scale

with “Standard scale” or

“Custom scale”.

4

3

Exercise


3. Edit a title block

1. Double click on a text in template area.

2. Fill up the attributes.

2

Exercise


4. Plotting

1. Go to menu bar, click

File >> plot

2. Complete the following plot dialogue box.

Exercise

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Chapter 13 AutoCAD

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