Autodesk Inventor – 2D Sketch / Constraints

Written by

March 17, 2020


Source: Autodesk Inventor

 The idea that geometry within Autodesk Inventor behaves differently due to the application of constraints often hinders new users transitioning from a 2D drawing application.

Autodesk Inventor uses constraints in two primary ways:

  • 2D and 3D sketch constraints control geometry within sketches
  • Assembly constraints and joints establish relationships between components in an assembly that control position and behavior.

Within the Autodesk Inventor sketch environment, there are two types of constraints: geometric and dimensional.

The status bar at the bottom of the graphics window indicates the number of dimensions required to fully constrain a sketch. As you sketch, apply geometric or dimensional constraints to reduce this number to zero and fully constrain, or stabilize, your sketch geometry.

Geometric Constraints

Geometric constraints are created automatically between lines, arcs, and other geometry as you sketch. Constraints can also be manually applied after the sketch geometry exists to stabilize sketch shape or position. These geometric constraints allow the sketch to be edited with predictable results. For example, dragging the endpoint of a line that’s constrained to be perpendicular to another line does not change the perpendicularity.

Constraints are inferred when sketching new or modifying existing geometry. This process of inference decides which constraints are available to the geometry as the shape and orientation are varied. As a constraint is inferred, the constraint symbol is shown, as well as dotted alignment lines, if applicable.

Constraint persistence determines if inferred constraints are maintained after the geometry is created. If constraint persistence is turned off, constraints are not created automatically. Varying inference and persistence settings can affect the results of sketch operations.

In this tutorial we will learn how to use Constraints tools in a 2D Sketch using Autodesk Inventor.

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