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A constraint in computer-aided design (CAD) software is a limitation or restriction imposed by a designer or an engineer upon geometric properties of an entity of a design model that maintains its structure as the model is manipulated.

In this Tech Tip, we will explain about the difference between ‘Fix’ and ‘Default’ type constraints in Assembly Design using Creo Parametric. Apparently these two types of constraints look similar as they both make the model fully constrained, but we will see two examples wherein we can understand the distinct difference between these two constraints.

The User Case
In the figure below, there are two scenarios. In first scenario, we need to fully constrain the support.prt in the context of the assembly. In second scenario, we need to fix the hook.prt at some angle w.r.t the hook_piston.prt For first scenario, we will use the ‘Default’ constraint and for the second scenario, we will use the ‘Fix’ constraint.