[To...] Posted August 24, 2022 Share Posted August 24, 2022 I have 2 surfaces that make up Datum B. If I recall the feature points from the 2 planes into a Symmetry Plane and change the evaluation to Outer Tangential, do you think this would be correct?sym plane 1.JPGsym plane 2.JPG Link to comment Share on other sites More sharing options...
[Ma...] Posted August 24, 2022 Share Posted August 24, 2022 You can confirm it with basic symmetry where you are selecting two planes. Link to comment Share on other sites More sharing options...
[To...] Posted August 24, 2022 Author Share Posted August 24, 2022 Second question. Unlike 2 parallel planes, it seems these 2 planes could control translation in the Y axis, though I don't believe the customer is expecting this as they are using a cone in the center of the part as Datum C. I think they should probably use the cone as Datum B and the Symmetry as Datum C....sym plane 3.JPG Link to comment Share on other sites More sharing options...
[Ma...] Posted August 24, 2022 Share Posted August 24, 2022 If they want to take only rotation from that symmetry plane then i would pick cone as C too. Many times they make datums as they are used on machining fixtures. One question - how you handle circles, cylinders and cones if you have less then 180° on ASME? Link to comment Share on other sites More sharing options...
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