[Ad...] Posted July 2, 2020 Share Posted July 2, 2020 I have a position on the two keys with an angle of 21 and 32 degrees. Now they have to be positioned to Datum's -A- and -B-. Datum -A- is a Circle and Datum-B- is on of the Keys at size .1051 to .1057. Here is my question when I input the the Datum's -A- and -B-, I use a theoretical Circle for Datum -B- in order to use MMB but the two keys would measure out of position. But when I change the theoretical circle to symmetry they would measure in position. I would like to know how is the Calypso calculating difference between using a theoretical circle as a Datum, and using Symmetry as a Datum? ThanksPosition.png Link to comment Share on other sites More sharing options...
[SH...] Posted July 3, 2020 Share Posted July 3, 2020 In calypso circle is two dimensional concept and plane is three dimensional concept, that might be the reason also you have to use cylinder as primary datum. Link to comment Share on other sites More sharing options...
[Gr...] Posted July 6, 2020 Share Posted July 6, 2020 I have provided an attachment from Zeiss has to how to help with the true position of a slot. Hope this helps Greg Link to comment Share on other sites More sharing options...
[Ad...] Posted July 6, 2020 Author Share Posted July 6, 2020 Okay, this make sense but is there a difference when using a circle or cylinder for Datum -A-? Because the diameter is not enough to create a cylinder. Link to comment Share on other sites More sharing options...
[Gr...] Posted July 6, 2020 Share Posted July 6, 2020 Did not see what features are the datum. I would use a face for spatial, the thru bore for center, datum A ? would be a circle for planar clocking. Create a secondary alignment (Resources>Utilities) and reference it for your measured slots. I have used symmetry plan but I get more stable results using the protocol I posted. Link to comment Share on other sites More sharing options...
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