A question came in recently about constraining a moving component of a SOLIDWORKS rigid sub-assembly to a component of the top-level assembly. The sub-assembly was fully constrained in the top-level assembly, so a mate between sub-assembly component and another component in the top-level assembly would not work. The sub-assembly was also not suitable as flexible, it had to remain rigid.
I brought up this question as a reminder that top-down or in-context modeling does not end with the placement of sketch planes and in-context relations or equations. In this case:
- The sub-assembly was edited within the top-level assembly.
- A plane was created based off a component of the main assembly.
- The moving part was then constrained with respect to that plane.
- The mate was created in the sub-assembly.
- But the reference plane was defined in context of the top-level assembly.
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