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CAD tip CAD tip # 7068:

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A
Since AutoCAD 2010 you can not only change the dimension by changing the geometry, but also use the opposite process - change the geometry by changing (overwriting) the dimension text.

From the ribbon Parametric > Dimension run e.g. the function Diameter constraint (the command DIMCONSTRAINT). Select a circle and confirm the placement of the dimension. Using the CONSTRAINTNAMEFORMAT variable you can influence the display of the dimension (dim constraint). Now double-click on the dimension text and change its value. The circle diameter will change accordingly.

See the animated sample:

Parametric dimension
ACAD2010
100% *CAD
23.11.2009    18763×  
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applies to: AutoCAD 2010 ·

See also:
Tip 14088:3 methods of creating true rectangles in AutoCAD.
Tip 13788:Green square - mathematical charade and parametric constraints in AutoCAD.
Tip 13185:Constraining object movement to a specified curve (rail) in AutoCAD.
Tip 12755:How to create a polyline with multi-colored segments?
Tip 11998:Double object snap (osnap) - how to align a line between two lines? (geom.constraints)
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