CAD tip # 4581:

Question CAD
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Why does AutoCAD insert my blocks in wrong scale?

Blocks and Xrefs contain their insertion unit settings, which are used for automatic scale conversion (rescale) when they are inserted/attached to a drawing using other units. These units are defined in the INSUNITS (default units), INSUNITSDEFSOURCE (source units) and INSUNITSDEFTARGET (target units) variables.

In older AutoCAD versions, these variables were used only for the block inserts/drags from DesignCenter. AutoCAD 2006 (and higher) uses them for all methods of insertion of blocks, xrefs and images.

If your blocks are inserted in an improper scale (e.g. scaling 0.254, 12, 10 or 1000), you have probably wrong (different) settings of your block insertion units. Set INSUNITS e.g. to 0 (unitless) - then both the INSUNITSDEFxxxx variables will apply - set them also to 0. Also make sure you are using the same measurement system (imperial/metric) in both drawings (the MEASUREMENT variable).

Check also the annotative scales. Please note that other unit settings apply when dealing with AEC drawings - see the AECDWGSETUP and -DWGUNITS commands.

ACAD2011ACAD2010ACAD2008ACAD2006CivilADT

* CAD

16.8.2005 141722× FAQ

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applies to: AutoCAD 2011 · AutoCAD 2010 · AutoCAD 2008 · AutoCAD 2006 · Civil 3D · AutoCAD Architecture ·

See also:
Tip 12421:	Wrong units in an imported DXF file.
Tip 6283:	My block insertion ignores the scale/units.
Tip 2528:	DesignCenter inserts 1000x larger blocks.
Tip 1907:	How to influence scale of blocks dragged from DesignCenter?

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