Composite position, threaded hole pattern

I have a cylindrical part with a set of holes drilled 90 deg apart (3 o'clock, 6 o'clock, 9 o'clock and noon) around the circumference. Total of 8 holes- 4 at one level, 4 at another. The callout is very common to this type part, a PLTZF callout of .038" RFS to A|B, then a FRTZF callout of .018" RFS to A.

My question, if I have done this properly in my PC-DMIS program, is there any way that all 8 holes could pass for the upper PLTZF callout, and simultaneously all 8 holes fail the FRTZF callout? I can't see how they could, but when I executed a program recently that I've used on many of these same parts, this is exactly what the results show.

On a side-note, the drawing doesn't restrain all 6 degrees of freedom, so I chose a feature on the part that made sense to me to use to close that gap.

Thanks in advance

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d.evans over 12 years ago

going from thread title... if you're using composite position in XactMeasure, you might wish to verify another way. XactMeas composite dim has issue, at least using it for profile. I would not trust totally for position either.

I'm still using version 3.7MR3, so no XactMeasure is in play here. This is the only one of the parts measured so far (out of about 10 units) that have failed in this manner (all 8 hole-to-hole features).
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d.evans over 12 years ago

going from thread title... if you're using composite position in XactMeasure, you might wish to verify another way. XactMeas composite dim has issue, at least using it for profile. I would not trust totally for position either.

I'm still using version 3.7MR3, so no XactMeasure is in play here. This is the only one of the parts measured so far (out of about 10 units) that have failed in this manner (all 8 hole-to-hole features).
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