[K...] Posted August 30, 2020 Share Posted August 30, 2020 I developed a plain 80mmx80mm as datum B which is measured by 20 hits within Ø124mm zone and in the same vector direction. Flatness is 0.028mm. I developed a 3-D line as a datum A by using 3 circles, length is 16.5mm. All circles roundness and locations are within 0.011mm. When I define Perpendicularity of 3-D line w.r.t to datum B, I found 0.045mm But if I defined datum B perpendicularity wrt to datum A (3-D Line), my result is 0.200mm. May I know the reason. Thank you Link to comment Share on other sites More sharing options...
[SH...] Posted August 30, 2020 Share Posted August 30, 2020 Please sign in to view this quote. What is the diameter of the circles?IMG_20200830_185436.jpg Link to comment Share on other sites More sharing options...
[K...] Posted August 30, 2020 Author Share Posted August 30, 2020 Ø of circles are 203 mm. Link to comment Share on other sites More sharing options...
[K...] Posted August 30, 2020 Author Share Posted August 30, 2020 Can we use datum feature for evaluation OR define datum feature 2nd time and then evaluate? Link to comment Share on other sites More sharing options...
[Ri...] Posted August 30, 2020 Share Posted August 30, 2020 Please sign in to view this quote. The ratio of axis length to diameter of your cylinder is too short to use as a Datum that is why you are seeing huge difference in results. You are getting projection error which is very common. Link to comment Share on other sites More sharing options...
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