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6 DOF joint - no rotations?

ptc-5233478
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6 DOF joint - no rotations?

Hello,

I'm using a 6 DOF joint to position the tool of a 5-axis parallel kinematic milling machine.

I referenced the Tool Center Point (TCP) and created a coordinate system with its origin in the TCP.

In the assembly of the frame i created a reference coordinate system.

Then i created a 6DOF joint using those two csys and referenced the zero positions of each axis to the origin points.

Now I can perfectly move the tool around in my assembly, but i cannot define any of the rotations. It is just twisting in space the way it feels like. I have no option to control it. Using planes and for example parallel conditions seems to work in a limited range, but will soon fail if the angles get too big. Sometimes the other connections don't get regenerated because they seem to be unable to find their connections or the whole model will refuse to update.

I also tried to make a new model without any other joints, yet I get the same problem that Creo only lets me define translative conditions and no rotational ones.

Did I get the purpose of the 6 DOF joint wrong or is it a bug? Did I miss an option?

Do you have another idea for positioning?


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