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Remembered Mating Constraints - Center

Remembered Mating Constraints - Center

Remembered Mating Constraints - Center

(OP)
We have put our standard parts out taking advantage of the "Remembered Mating Conditions" functionality.  However, trying to do 'O' ring seals this way seems to be preblematic.  If I align the central axis of the seal to the centre of the seal groove the constraint is remembered, but trying to do the axial constraint with a center 1 to 2, picking a datum plane in the centre of the seal and the 2 faces of the seal groove, the constraints go in OK, positions OK, appear in the mating Conditions dialogue box but UG will not save it as a preferred mating condition (seems to save 1 to 1 Centers OK).  I can check in the File > Properties > Part File tab to see what has been remembered.  Anyone else see this, or know of a way round it?  Seems to be the case for NX2.0.4.2 and NX3.0.3.2.

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