Missing constraints

[donovandigital]

Could someone please tell me which constraints are missing here? In general, what is the best strategy for identifying missing constraints, besides deleting everything and starting over?

Many thanks in advance

[JDMather · Accepted solution]

Turn on the DOF symbols.

Your sketch is not constrained to the origin.

You must have deleted the projected origin at some time.

Whenever you have an expectation that something should be fully constrained - but Inventor indicates it is not - start dragging endpoints.

The necessary geometry constraint should then be obvious.  Exercise your sketches by attempting to drag.

In this case - since you are not constrained to the origin, the entire sketch can move.

Project Geometry the Origin Center Point and add one Coincident Constraint to fix the problem.