How to turn On/Off Inferred Geometric Constraints in AutoCAD

Issue:

You would like to have Geometric Constraints automated. When you draw an object in AutoCAD geometric constraints would be added automatically.  

Example: if a line is drawn Horizontal or close to it then a Horizontal Constraint is automatically added.

Causes:

This can be done using the CONSTRAINTINFER (System Variable). This System Variable is turned off by default.

Solution:

Autodesk Help description is as follows

CONSTRAINTINFER (System Variable)

Controls whether the geometric constraints are inferred while drawing and editing geometry

1 - Geometric constraints are inferred

To enable this System Variable

• Once in a Drawing in AutoCAD.
• Type CONSTRAINTINFER in the Command Line and select the <Enter> Key on your Keyboard.
• Type 1 (to enable the System Variable) and select the <Enter> Key on your Keyboard.
• CONSTRAINTINFER is now enabled. Objects edited or draw will now Auto-Constrain.

To disable this System Variable

• Once in a Drawing in AutoCAD.
• Type CONSTRAINTINFER in the Command Line and select the <Enter> Key on your Keyboard.
• Type 0 (to disable the System Variable) and select the <Enter> Key on your Keyboard.

CONSTRAINTINFER is now disabled. Objects edited or draw will not Auto-Constrain.

About the Author

Manufacturing Solution Center Team Lead<br><br>Jeff is responsible for manufacturing Technical Support for both internal staff and customers. In addition to the daily activities of the support center, he helps write for the National Support Center blog, and has written online classes for the IMAGINiT training on demand site.

Follow on Linkedin More Content by Jeff Arbogast