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Closed kinematic chains with revolute joints

ralph_stirlingralph_stirling Member Posts: 5 EDU
Is it possible to make closed kinematic chains with bars and revolute joints, and have them stay connected while adjusting joint angles?  I've been playing with a five-bar planar manipulator model, and not achieving success.  I'm quite new to OnShape, so may be building my assembly incorrectly. 

My play model is at: https://cad.onshape.com/documents/953be8731a3021a4fde4e2bf/w/b266e1e6c74cca763dd277a0/e/7bbe4b301279a0e277061bad

-- Ralph


  • NeilCookeNeilCooke Moderator, Onshape Employees Posts: 3,021
    Hi @ralph_stirling - your doc is shared as a link and can't be copied/edited - please make it public. Try fixing the orange base (right-click / fix) so that the whole thing doesn't move around.
  • ralph_stirlingralph_stirling Member Posts: 5 EDU
    Thanks Neil.  I've shared it and fixed the base.
  • NeilCookeNeilCooke Moderator, Onshape Employees Posts: 3,021
    You can't add a revolute mate to attach the last two links because it introduces tolerance errors (this is a system limitation and not anything to do with what you are trying to do). Use a cylindrical mate instead.
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