Your explanation makes complete sense. Thank you for your help. I couldn't quite figure out from ASME GD&T why there was sometimes a diameter call-out and other times not.
Jeanne
There is some disagreement among engineers at my work in the calculation of true position without a diameter call-out. Given an open ended datum notch with the following tolerances:
Width .100 +/-.002
Drop from base of slot to datum surface is 1.267+/-.005
[TRUE POSITION|.006|E|F] (with basic...
Yes, I actually did mean to say that the profile is bilateral distribution, not unilateral.
Thank you for all the replies which confirm my opinion that the average value does not reflect the true shape of the profile, especially given that one point is measured outside of the tolerance zone.
As a standard rule, when given multiple inspection points taken via CMM or other method, how do you report the data to the customer? Do you report the worst case, the average or the range of data?
ie, if a profile of unilateral distribution is .006, and 9 inspection points are taken along the...
