MODULE 35 DIMENSIONING PART 2

AutoCAD 2D III Module 35: Dimensioning – Part 2 - 118 -

DIMENSIONING – PART 2

MODULE 35

Basic Dimension Types

In this module, you will learn how to insert and edit the six dimensioning types shown in the figure below. They are Linear, Aligned, Diameter, Radius, Leader

and Angular. More advanced dimensioning options will be covered later in this course.

LEARNING OUTCOME

After the completion of this module, you will be able to:

Describe the six basic dimensions types.

Describe and apply the DIMLINEAR, DIMALIGNED, DIMDIAMETER,

DIMRADIUS, QLEADER, DIMEDIT, and DIMTEDIT commands.

Institute of Applied Technology ®

AutoCAD 2D III Module 35: Dimensioning – Part 2

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Before you start dimensioning your drawing, make sure of the following settings:

The current layer that you want your dimensions to reside on.

The current dimensioning style. When you insert a dimension it will take the

properties of the current dimension style . you can select your dimensioning style by using the Styles toolbar

The DIMASSOC settings. 2 for associative, 1 for non-associative and 0 for

exploded.

Using The DIMLINEAR Command

The DIMLINEAR command is used to insert linear dimension.

To dimension the drawing as shown below follow the procedure.

Command Keyboard input /

Alias Menu

DIMLINEAR DIMLINEAR/DIMLIN Dimension>

Linear



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Command: dimlin

DIMLINEAR Specify first extension line origin or <select object>: P1

Specify second extension line origin: P2 Specify dimension line location or [Mtext/Text/Angle/Horizontal/Vertical/Rotated]: P3

Dimension text = 50

Command: _dimlinear Specify first extension line origin or <select object>: (Press enter or spacebar)

Select object to dimension: P1 Specify dimension line location or [Mtext/Text/Angle/Horizontal/Vertical/Rotated]: P2

Dimension text = 40

Command: dimlinear Specify first extension line origin or <select object>: P1

Specify second extension line origin: P2 Specify dimension line location or [Mtext/Text/Angle/Horizontal/Vertical/Rotated]: P3

Dimension text = 65.6

Using The DIMALIGNED Command

The DIMALIGNED command is used to insert aligned dimensions.

Command Keyboard input / Alias Menu

DIMALIGNED DIMALIGNED/DIMALI Dimension> Aligned



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Command: dimaligned Specify first extension line origin or <select

object>: (Press enter or spacebar to select object)

Select object to dimension: P1

Specify dimension line location or [Mtext/Text/Angle]: P2 Dimension text = 46.2

Command: dimaligned Specify first extension line origin or <select

object>: P1 (Point to point 1 to select the center of the circle, in your Osnap settings center should be

checked )

Specify second extension line origin: P2 Non-associative dimension created. Specify dimension line location or

[Mtext/Text/Angle]: P3 Dimension text = 33.6

Using The DIMANGULAR Command

The DIMANGULAR command is used to insert angular dimensions.

Command Keyboard input /

Alias Menu

DIMANGULAR DIMANGULAR/DIMANG Dimension>

Angular



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Command: _dimangular Select arc, circle, line, or <specify vertex>: P1 Select second line: P2

Specify dimension arc line location or [Mtext/Text/Angle]: P3 (Move the cursor around and AutoCAD will

display all the possibilities)

Dimension text = 60d

Command: _dimangular

Select arc, circle, line, or <specify vertex>: (Press Enter to specify vertex)

Specify angle vertex: end of P1

Specify first angle endpoint: end of P2 Specify second angle endpoint: end of P3 Specify dimension arc line location or [Mtext/Text/Angle]: P4

Dimension text = 120d Using The DIMDIAMETER Command

The DIMDIAMETER command is used to insert a diameter dimension.


DIMDIAMETER DIMDIAMETER/DIMDIA Dimension>

Diameter



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Command: _dimdiameter Select arc or circle: P1

Dimension text = 20.0 Specify dimension line location or [Mtext/Text/Angle]: P2

Command: _dimdiameter

Select arc or circle: P1 Dimension text = 20.0 Specify dimension line location or

[Mtext/Text/Angle]: T Enter dimension text <20.0>: 20 DIA (Another way to enter 20 DIA is by typing <>DIA)

Specify dimension line location or [Mtext/Text/Angle]: P2

Using The DIMRADIUS Command

The DIMRADIUS command is used to insert a radius dimension.


DIMRADIUS DIMRADIUS/DIMRAD Dimension>

Radius



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Command: _dimradius Select arc or circle: P1 Dimension text = 25.0

Specify dimension line location or [Mtext/Text/Angle]: P2

Command: _dimradius Select arc or circle: P1 Dimension text = 25.0

Specify dimension line location or [Mtext/Text/Angle]: T

Enter dimension text <25.0>: 25 R (Insert 25 R or <>R)

Specify dimension line location or

[Mtext/Text/Angle]: P2 Using The QLEADER Command

The QLEADER command is used to a leader dimension.


QLEADER QLEADER Dimension>

Leader



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Command: QLEADER Specify first leader point, or [Settings]

<Settings>: _nea to P1 (Snap to nearest using the object snap settings tool bar)

Specify next point: <Ortho on> P2 (Press F8 to switch Ortho mode on)

Specify text width <3.1797>: (Press enter to accept default or change this number)

Enter first line of annotation text <Mtext>: THICKNESS (Press Enter to insert the second line)

Enter next line of annotation text: 3mm

Enter next line of annotation text: (Press Enter to exit the command)

You can change the settings of the leader if you want.

Command: QLEADER Specify first leader point, or [Settings] <Settings>: S

(Pressing Enter will open the Leader Settings dialogue box.)

Study the different options in the different tabs.

The Annotation Tab



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The Leader and Arrow Tab.

The Attachment Tab



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Using The DIMEDIT Command

The DIMEDIT command is used to edit dimensions.

Home

Moves rotated dimension text back to its default position.

Command: DIMEDIT Enter type of dimension editing [Home/New/Rotate/Oblique] <Home>:

(Press Enter to accept default)

New

Changes dimension text. Command: DIMEDIT

Enter type of dimension editing [Home/New/Rotate/Oblique] <Home>: N (Pressing Enter will open the Text Formatting text box)


DIMEDIT DIMEDIT / DIMED Dimension> Align Text

Before Home After Home

Change the dimension text here.



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In this example, mm is added to the dimension text.

Rotate Rotates dimension text.

Command: DIMEDIT Enter type of dimension editing [Home/New/Rotate/Oblique] <Home>: R Specify angle for dimension text: 45

Select objects: P1 (Select the dimension)

1 found

Oblique Adjusts the oblique angle of the extension lines for linear dimensions.

Command: DIMEDIT Enter type of dimension editing [Home/New/Rotate/Oblique] <Home>: O

Select objects: P1 1 found (Select the dimension)

Select objects:

Enter obliquing angle (press ENTER for none): 60

Before After

Before After



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Using The DIMTEDIT Command The DIMTEDIT command is used to edit the text of associative and non-

associative dimensions.

Command: DIMTEDIT

Select dimension: Specify new location for dimension text or [Left/Right/Center/Home/Angle]:


DIMTEDIT DIMTEDIT / DIMTED Dimension> Align Text

Before After

Left Aligned Center Right Angle (45)



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Tip

A center mark or a centerline can be added to the drawings by using the

Center Mark icon on the dimension toolbar.

Line Mark

Make sure that your dimension style set

to Line or Mark.

Tip

You can use Properties to edit individual associative or non-associative

dimension.



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TASK 1 DETAILS

Instructions:

1. Insert the block AutoCAD 2D Lab 12-2. 2. Explode it and then reside all objects in layer Objects. 3. Create a dimensioning style named: Module 35.

4. Start with ISO-25. 5. Make any modification to the dimensioning style that you find necessary to make the dimensions similar to the

drawing below. 6. Insert all the dimensions shown below as associative dimensions.

7. Complete the Titleblock.

Lab Exercise 35-1 Time Allotted: 40 min.

Drawing Specifications

Name Template Units Text Style Font

AutoCAD 2D Lab 35-1 Module Template A4 Millimeters N/A N/A

Layering Scheme

Objects on Layer Name Color Linetype Lineweight

Construction Objects Construction 253 Continuous N/A

Dimensions Dimension Red Continuous N/A

All Objects Object Black Continuous 0.3

Centerlines Center Blue Centerline N/A



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Module 35 Review Questions

1. Which one of the following is not one of the basic dimension types?

a. Linear

b. Aligned

c. Leader

d. Guide

2. Before starting dimensioning, make sure of the following settings.

a. The current layer.

b. The current dimension style.

c. The associativity settings.

d. All of the above.

3. The DIMALIGNED command is used to insert ___________ dimensions.

a. Linear

b. Aligned

c. Leader

d. Angular

4. The alias DIMANG is used when we want to insert _________ dimensions.

a. aligned

b. linear

c. angular

d. leader

5. If you want to snap to an object but not a particular location on that

object, use ________ snap mode.

a. node

b. quadrant

c. nearest

d. close



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6. In leader settings dialogue box, the number of points QLEADER prompts

before prompting the leader annotations can be ______ .

a. any number of points

b. 3 points maximum

c. 6 points maximum

d. 9 points maximum

7. The following command is used to edit dimensions.

a. DIMEDIT

b. DDIMEDIT

c. DIMTTEDIT

d. DIMPROPERTIES

8. When using the dimension editing command, selecting Home will _____.

a. move rotated dimensions back to its default position

b. change the dimension text

c. go back to the home page

d. None of the above.

9. The DIMTEDIT is used to edit the text in ___________ dimensions.

a. associative

b. non-associative

c. exploded

d. a and b are correct.

10. Properties can not be used to edit __________ dimensions.

a. associative

b. non-associative

c. exploded

d. None of the above.

You can set the

polar angle

measurem

ent to absolute

or relative

Documents

MODULE 35 DIMENSIONING PART 2