four bar mechanism

[dani mendez]

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Good afternoon,
I have created a four link bar mechanism to do a series of tests, my problem is, the mechanism cannot move and I don't understand why. The axes of rotation are all parallel. As it is a closed system to connect the red link with the blue one I have created two equal models of the red link, the first one I connect to the ground using a customjoint, the second red link I connect it to the blue one with a customjoint, and the two red links I connect them between them with a WeldConstraint. If I deactivate the WeldConstraint I can move each link manually, but activating it blocks the entire mechanism.
Any ideas to fix the problem? Thank you

[Michael Sherman]

Suggestion -- try building this using only built-in pin joints plus the weld constraint. Does that work? If so there may be some problem with your custom joint.