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CAD tip # 8971:

Question CAD
% platform category

Linking together values of two dimensions in AutoCAD.

You have two dimensions and you need to automatically change the second dimension when the first dimension is updated - to the same or to a derived value.

You can use dynamic text fields for such link. Create the first dimension in a usual way, by dimensioning an object. Create the second dimension, double-click on its text to edit it (use DDEDIT in older AutoCAD versions). Delete the original text (the dimension value) and choose Insert > Field from the context ribbon (or press Ctrl+F). In the Field dialog, choose the category Objects, the field Object. Select the the object of the first dimension and from the Properties list choose the property "Measurement". Adjust the Format and Additional format as neccessary and finish editing of the second dimension.

Both dimensions stay dynamically linked - the second one depends on changes of the first one (after regeneration or save).

Text fields can contain also arithmetic expressions (see the tip 9717), so you can also modify the text of the second dimension by a calculation.

ACADLT

* CAD

15.12.2012 7833×

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AutoCAD LT

applies to: AutoCAD · AutoCAD LT ·

See also:
Tip 12616:	Att2elev - move block to elevation specified by its attribute.
Tip 12470:	A table with calculated expressions is suddenly dead, doesn't calculate and update.
Tip 11888:	Dynamic label of area and perimeter - DynArea.
Tip 11794:	Undocumented code in field expression - MText contents without control characters.
Tip 11565:	AttDefault - reset block attributes to default values.

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