[Cl...] Posted November 20, 2018 Share Posted November 20, 2018 What is the correct evaluation for the primary Datum used in Radial Runout? I was under the impression that it was Outer tangential? If I apply Minimum Feature I get correlation with a roller gage/test indicator. Link to comment Share on other sites More sharing options...
[Br...] Posted November 20, 2018 Share Posted November 20, 2018 I would always use Outer Tangential for Datum Features. Link to comment Share on other sites More sharing options...
[Cl...] Posted November 20, 2018 Author Share Posted November 20, 2018 That's what I've always used too, but I doubted the result from one part and checked it with a roller gage/test indicator. I wasn't seeing what the CMM was telling me. So I started playing around with the evaluation settings until I got a match. Link to comment Share on other sites More sharing options...
[Br...] Posted November 20, 2018 Share Posted November 20, 2018 Outer tangential is very susceptible to outliers so you do need to filter when using it, but it best represents the Unrelated Actual Mating envelope necessary to produce the Datum Axis. Link to comment Share on other sites More sharing options...
[Da...] Posted November 21, 2018 Share Posted November 21, 2018 I take it that you are using a cylinder as the primary datum ? Link to comment Share on other sites More sharing options...
[Cl...] Posted November 21, 2018 Author Share Posted November 21, 2018 Yes. Link to comment Share on other sites More sharing options...
[To...] Posted November 27, 2018 Share Posted November 27, 2018 Please sign in to view this quote. aha That is Rule #2 in the "How To Make It Green" training. Rule #1 being "Replace the red ink cartridge with a green one." Link to comment Share on other sites More sharing options...
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