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CAD tip CAD tip # 7824:

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Using constraints for simulations of mechanisms in AutoCAD.

A - answer With geometric constraints in AutoCAD you can simulate functionality of simple mechanisms. An example employing blocks of the Czech toy construction set "Merkur" is shown in the AutoCAD video #26.

This example uses a set of "coincident" constraints - see the ribbon Parametric > Geometric > Coincident), command GCCOINCIDENT. The constraints are applied in the pivot points (joints) of the individual parts. Another three fixed constraints, anchors (command GCFIX) are applied in the positions marked with the block "NUT" (white dots). When applying constraints, first select the object which will drive the movement.

The drawing Merkur1 used in the above video can be downloaded from the Block library - see Merkur1.dwg.

By rotating the wheel block you can drive the whole mechanism. The LISP file driving the rotation (angle) parameter is attached to the blocks (rename the .TXT file in the attachment to .LSP and load it into AutoCAD).

100% *  CAD 
27.2.2011    5419x  
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applies to: AutoCAD 2011 ·

See also:
Tip 10039:Two types of equidistants (offsets) to an ellipse.
Tip 9339:When moving one entity, the adjacent entity moves too.
Tip 8846:Parametric triangles - isosceles, right-angled, equilateral
Tip 7305:Two different rectangles with the same AutoCAD 2011 command.
Tip 7068:Parametric dimensions: changing geometry by overwriting dimension.

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