Marco,
Try replacing one of the spherical joints with a Universal Joint (a "U-joint"). That will usually take out the extra rotational DOF.
You say "automatic joints"; I never had alot of success converting assembly constraints into kinematic joints, so I always defined all the joints manually.
You might have to create some dummy parts in your mechanism to resolve some of the extra DOF.
Another trick to try is to go ahead and run the simulation with 2 DOF (as if you have 2 input commands), and just use "0" as the rotation of the link rod.
Last edited by MrCATIA : December 11th, 2007 at 03:24 PM.
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