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Assembly problems involved movement


I assembled some parts to be two slider-crank mechanisms with almost the same constraits, but there was a problem puzzling me. In the slider-crank mechanism.prt, there is a subassembly, and the mechanism can't be moved. Whereas, in the slider-crank mechanism_modified.prt, all the components are at the same level, and the mechanism can be moved. Why? How can I make the former mechanism effective as the second one with the subassembly?