[Cl...] Posted October 1, 2020 Share Posted October 1, 2020 I have an OD cylinder (primary datum) with stepped ID bores through the center that need their true positions checked back to it. The part is in two halves, each only about a 165 degree circle. What would be the best way to create the full 360 degree datum? Measuring (as a cylinder) one half at a time, the 165 deg segments, and constraining them? Recall the points into circles and recall them into a cylinder, or 3d line? Does someone have a better idea? Link to comment https://qualityforum.zeiss.com/topic/14480-half-a-part/ Share on other sites More sharing options...
[Ow...] Posted October 1, 2020 Share Posted October 1, 2020 When you say by two halves, do you mean they are two separate pieces? - or- one cylinder with only 165° available on each side of it? Link to comment https://qualityforum.zeiss.com/topic/14480-half-a-part/#findComment-76032 Share on other sites More sharing options...
[Ri...] Posted October 1, 2020 Share Posted October 1, 2020 Please sign in to view this quote. If they are two separate parts, then you might actually have better luck use Free-Form to construct the cylinder. Just a shot in the dark. I'm actually not a huge fan of constraints, but that's a discussion for another time. Link to comment https://qualityforum.zeiss.com/topic/14480-half-a-part/#findComment-76034 Share on other sites More sharing options...
[Cl...] Posted October 1, 2020 Author Share Posted October 1, 2020 Sorry, one cylinder sliced down the center. Link to comment https://qualityforum.zeiss.com/topic/14480-half-a-part/#findComment-76036 Share on other sites More sharing options...
[Cl...] Posted October 1, 2020 Author Share Posted October 1, 2020 Please sign in to view this quote. Link to comment https://qualityforum.zeiss.com/topic/14480-half-a-part/#findComment-76038 Share on other sites More sharing options...
[Ri...] Posted October 1, 2020 Share Posted October 1, 2020 You could do that, or just measure it as a FF with a point-set. Link to comment https://qualityforum.zeiss.com/topic/14480-half-a-part/#findComment-76040 Share on other sites More sharing options...
[Cl...] Posted October 1, 2020 Author Share Posted October 1, 2020 So, what is the rational behind this strategy. What potential benefits are there? Link to comment https://qualityforum.zeiss.com/topic/14480-half-a-part/#findComment-76042 Share on other sites More sharing options...
[Ri...] Posted October 1, 2020 Share Posted October 1, 2020 Please sign in to view this quote. The FF isn't a geometric shape that the software is trying to calculate with half of the data that it needs. It will not be affected like your Circle/Cylinder will be. It will save you from trying to constrain things. Just a thought. Link to comment https://qualityforum.zeiss.com/topic/14480-half-a-part/#findComment-76044 Share on other sites More sharing options...
[Cl...] Posted October 1, 2020 Author Share Posted October 1, 2020 OK, makes sense. Thanks. Link to comment https://qualityforum.zeiss.com/topic/14480-half-a-part/#findComment-76046 Share on other sites More sharing options...
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