CAD tip # 13185:

Question CAD
% platform category

Constraining object movement to a specified curve (rail) in AutoCAD.

n AutoCAD, you can use parametric geometric constraints, specifically the Coincidency constraint (GCCOINCIDENT) to bind a specified object point to a selected curve. So you can force the object to move only along a trajectory that follows the specified control curve (line, spline, arc, etc.).

Only 2D geometry can be used for control curves. You do not need to use just an offered point on the object geometry to specify the constraint point, but you can also use any osnap point - e.g. the center of a circle, the insertion point of a block, etc. It is advisable to anchor the control curve in advance (the Fixed constraint, GCFIX).

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10.1.2022 275×

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applies to: AutoCAD ·

See also:
Tip 12755:	How to create a polyline with multi-colored segments?
Tip 12046:	Random shape and appearance of an Inventor part or assembly.
Tip 11896:	How to drive dyn.block parameters or constraints from Excel?
Tip 11761:	Parametric constraints between 3D objects in AutoCAD.
Tip 11522:	How to create 3D splines in Fusion 360 - e.g. for pipe axes?

Selected tip: Multiple "Geospatial Coordinate Systems" folders in Autodesk products.

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