[po...] Posted August 3 Share Posted August 3 Which is better to use for runout datum a cylinder or a 3D line recalled from two circles measured in the cylinder. The a 3D line seems to give lower numbers than a cylinder. Is due to the cylinder axis is extend out forever and a 3D line is only the length from circle to circle? Link to comment https://qualityforum.zeiss.com/topic/27168-runout-3d-line-or-cylinder/ Share on other sites More sharing options...
[Ma...] Posted August 3 Share Posted August 3 Datum A is evaluated as outer tangential. 1 Link to comment https://qualityforum.zeiss.com/topic/27168-runout-3d-line-or-cylinder/#findComment-153840 Share on other sites More sharing options...
[RP...] Posted August 3 Share Posted August 3 Please sign in to view this quote. So what you're saying is, per print, Datum -A- should be a cylinder with OT eval instead, not LSQ eval for the runout callout? I assumed short cylinders would be better evaluated as 3d lines. Link to comment https://qualityforum.zeiss.com/topic/27168-runout-3d-line-or-cylinder/#findComment-153846 Share on other sites More sharing options...
[Ma...] Posted August 3 Share Posted August 3 Please sign in to view this username. I'm just saying how is this cylinder treated as a datum in any callout. This datum looks like 1:1 ratio Link to comment https://qualityforum.zeiss.com/topic/27168-runout-3d-line-or-cylinder/#findComment-153850 Share on other sites More sharing options...
[Da...] Posted August 3 Share Posted August 3 ASME or ISO? Link to comment https://qualityforum.zeiss.com/topic/27168-runout-3d-line-or-cylinder/#findComment-153852 Share on other sites More sharing options...
[Ma...] Posted August 3 Share Posted August 3 Please sign in to view this username. in both Link to comment https://qualityforum.zeiss.com/topic/27168-runout-3d-line-or-cylinder/#findComment-153854 Share on other sites More sharing options...
[Lu...] Posted August 4 Share Posted August 4 Please sign in to view this quote. Yes in ISO you have the ISO 5459 that establish in other stuff DATUM and the evaluation for datum is like ASME outer tangengial. not LSQ. Link to comment https://qualityforum.zeiss.com/topic/27168-runout-3d-line-or-cylinder/#findComment-153860 Share on other sites More sharing options...
[Ke...] Posted August 4 Share Posted August 4 Please sign in to view this quote. If "better" means more repeatable, then that would be atrue statement... but to evaluate to a standard, then Cylinder with Outer Tangential would be "correct"; however, I believe that using LSQ for the Cylinder (or using a 3D Line) would be acceptable for the purposes of an R&R study. 2 Link to comment https://qualityforum.zeiss.com/topic/27168-runout-3d-line-or-cylinder/#findComment-153866 Share on other sites More sharing options...
[To...] Posted August 4 Share Posted August 4 (edited) this is here because there is no "delete post" option. Edited August 4 Link to comment https://qualityforum.zeiss.com/topic/27168-runout-3d-line-or-cylinder/#findComment-153874 Share on other sites More sharing options...
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