Chapter 5 dimensioning in auto cad 2010

Copyright ©2009 by K. PlantenbergRestricted use only

Chapter 5Dimensioning in AutoCAD

Topics


Dimensioning: TopicsSummary5.1) Introduction5.2) Dimension Commands5.3) Dimension Style5.4) Dimension Variables5.5) The DIM Prompt5.6) Associative Dimensions5.7) Annotative Objects


Dimensioning in AutoCAD

Summary


Summary What will we learn in Chapter 5?

→ The skills necessary to dimension an orthographic projection.

Key points→ By default, dimensions are associative. If

you manually type in a dimension, the associativity is broken.



5.1) Introduction


Introduction AutoCAD automatically creates the

dimensions and dimension text once a feature is selected.

Dimension appearance and properties may be adjusted in the Dimension Styles Manager window.



5.2) Dimension Commands


Dimensions Panel


Leaders Panel

Collect Multileaders

Align Multileader



5.3) Dimension Style


Dimension Style The Dimension Style Manager is used to

create:→ New dimension styles, → set the current style, → modify styles, → set overrides on the current style, → and compare styles.

Access using: DDIM, DIMSTYLE or from the Dimensions panel


Multileader Style The Multileader Style Manager is used

to create:→ New multileader styles, → set the current style, → and modify styles,

Access using: MLEADERSTYLE or from the Leaders panel.



5.4) Dimension Variables


Dimension Variables Dimension appearance may be

modified by changing dimension variables. → These variables may be set in the

Dimension Styles Manager.

It is not uncommon to change some of these variables on the fly within the Command window.


Dimension Variables Commonly used dimension variables

→ DIMSCALE: This command sets the overall size or scale factor of the dimensions.

→ DIMTIX: Forces dimension text inside extension lines.

→ DDEDIT: Edits dimension text. → DIMCEN: Controls size of the center marks

drawn by diameter and radial dimensions.→ UPDATE: Applies the changes.

Other variables are given in section 5.4)


Dimensioning Creating and modifying dimensions.

Live Demonstration



5.5) The DIM Prompt


The DIM Prompt Within the Dim prompt (the dimension

mode), you can type in dimensioning commands that allow you to create and modify dimensions. → DIM: Accessed the DIM prompt.→ EXIT: Exits the DIM prompt.



5.6) Associative Dimensions


Associative Dimensions Associative dimensions are associated

(connected) with the dimensioned object. → If the object is changed, the associated

dimension value will change.

Live Demonstration


Associative Dimensions Associativity is broken if...

→ You manually type in the dimension text → replace the dimension text → EXPLODE the dimension

Multileaders are not associative.



5.7) Annotative Objects


Annotative Objects Annotative objects support multiple

viewport scales. (Dimension, text, hatches ...)

1:1 scale

1:2 scale


Annotative Objects Annotative objects support multiple

viewport scales. (Dimension, text, hatches ...)

1:1 scale

2:1 scale


Annotative Objects Each supported scale adds to the file

size.


Annotation Scaling Panel



End

Engineering

Chapter 5 dimensioning in auto cad 2010