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what does the cyclic sym constranit actaully do?

what does the cyclic sym constranit actaully do?

what does the cyclic sym constranit actaully do?

(OP)
I'm having trouble with the cyclic symmetry constraint.  I've got an axis symmetric part which I have created a quarter slice of and defined a cylidrical csys with z along the axis of revolution.  The model has a cyclic constraint on the two plar faces of the 1/4 slice faces, a constraint which prevent translation along the z axis, and a constraint along the OD which prevents radial displacement.  When I run the model I am told it is insufficiently constrainted.  I would have thought that the cyclic sym constraint would prevent the 1/4 slice faces to displace normal to the constraint, which should constrain my theta direction.

Can anyone help me with what seems to be a very basic condition?

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