[To...] Posted May 12, 2020 Share Posted May 12, 2020 Customer is making pins with a +/- 0.0025mm diameter tolerance. There is no straightness call-out but they need to make sure pin fits into hole. They are measuring pin with 5 circles and are checking the diameter of each circle. Next, they created a 3d line by recalling the 5 circles and they are checking the straightness. They understand this is only axial straightness. Next, they have created a cylinder by recalling the features points from the 5 circles and getting the same result when they check straightness. In an attempt to meet Rule #1, they created a straightness tol for the Cylinder of 0.000 @MMC and set the evaluation to Outer Tangential. They’re asking if there is any way to develop a surface straightness from the data collected in the circles. Is this the best way to meet the requirements Rule #1? Any comments or suggestions are gladly welcomed. Link to comment Share on other sites More sharing options...
[Da...] Posted May 12, 2020 Share Posted May 12, 2020 Per ISO or ASME Link to comment Share on other sites More sharing options...
[Da...] Posted May 12, 2020 Share Posted May 12, 2020 I have been playing with this you get some interesting answers I modeled it and the shift is 0.500 inch You get a lot of different answers Know I just need to wrap head around itCapture.JPG Link to comment Share on other sites More sharing options...
[Da...] Posted May 12, 2020 Share Posted May 12, 2020 ResultsCapture4.JPGCapture3.JPGCapture2.JPGCapture1.JPGCapture.JPG Link to comment Share on other sites More sharing options...
[Da...] Posted May 12, 2020 Share Posted May 12, 2020 Diameter that it would fit in is 2.5 Per Rule 1 Diameter of Pin is 2.0 Link to comment Share on other sites More sharing options...
[SH...] Posted May 12, 2020 Share Posted May 12, 2020 Please sign in to view this quote. my opinion is that your customer should change design from straightness to cylindricity because cylindericity control both axial and surface straightness.One shoot two Bird..... Link to comment Share on other sites More sharing options...
[Da...] Posted May 12, 2020 Share Posted May 12, 2020 Per OTG (Outer Tangential Element) You get the 2.5 on diameter The 2.019 is LSQCapture1.JPGCapture.JPG Link to comment Share on other sites More sharing options...
[Da...] Posted May 12, 2020 Share Posted May 12, 2020 Remember this is only per ASME ISO Rule 1 doesn't apply unless stated on the print. "The Envelope Principle" Link to comment Share on other sites More sharing options...
[SH...] Posted May 12, 2020 Share Posted May 12, 2020 Please sign in to view this quote. Zeiss cookbook explain any solution about this problem?? Link to comment Share on other sites More sharing options...
[Da...] Posted May 12, 2020 Share Posted May 12, 2020 Let me check that is a great question Link to comment Share on other sites More sharing options...
[Da...] Posted May 12, 2020 Share Posted May 12, 2020 It is calling it to be measured with lines on the cylinder along the axis That is Surface Straightness I am not finding rule #1 Link to comment Share on other sites More sharing options...
[Da...] Posted May 13, 2020 Share Posted May 13, 2020 Isn't straightness irrelevant ? A cylinder as OTE is an envelope feature. Cylinder diameter accounts for bent, or non-straight variations, and size all along the feature, right ? Link to comment Share on other sites More sharing options...
[Ke...] Posted May 13, 2020 Share Posted May 13, 2020 Please sign in to view this quote. That's where I was going with this too... If it passes size for Envelope (OT or MCE), then it should fit. Maybe restrict it further with straightness. Link to comment Share on other sites More sharing options...
[Da...] Posted May 14, 2020 Share Posted May 14, 2020 Please sign in to view this quote. You could throw in a cylindricity callout to regulate roundness and taper, but remember that cylindricity is a per side tolerance, so run at about 1/2 your size callout. Link to comment Share on other sites More sharing options...
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