Feature Variation and Bonus Tolerance
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: Feature Variation and Bonus Tolerance
: Feature Variation and Bonus Tolerance -- gwiacek	Post Reply	Top of thread	Engineering Forum

Posted by: traingdt ® 03/15/2010, 15:56:44 Author Profile eMail author Edit

I'm not familiar with a specific provision for this either. I do know that there is a "rule of thumb" out there that when designing physical gages there is a 10% allowance (5% of that is for wear) based on the product tolerance. Could this be what you are thinking of? Or maybe I'm way off on a different topic

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: Feature Variation and Bonus Tolerance
: Feature Variation and Bonus Tolerance -- gwiacek	Post Reply	Top of thread	Engineering Forum

Posted by: Kelly Bramble ® 03/15/2010, 10:42:26 Author Profile eMail author Edit

First, your tolerances and description look familiar to me - BAL EMI seal width? Spira EMI seal width? The BAL eccentric EMI seal could have challenges with this as-built groove, however I doubt it. I suspect you could non-conformance this through and ask manufacturing to look at their processes and be careful next time. As far as the width (or depth) of this groove, I'm not aware of a specific geometric tolerance that will give the tolerance variation on size as you described. You just have to increase the size tolerance to accommodate this - size ANSI/ASME standard does provide a geometric tolerance (Position) that when applied with a MMC modifier will allow additional LOCATION tolerance when the size changes towards LMC. There are other methods involving notes and statistical tolerances. What standard do you folks work to?

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