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Slot True Position with Datum Conditions

BCB12416
So I have looked at every bidirectional TP thread on - I am programming for a customer with 2011 MR1, so width is out of the question (and has been flaky at best in 2014.1).


With only a few years experience, I was never taught constructing generic features. I think I have a grasp on creating generic features for the two slots, my trouble is creating generic features for the datums called out and applying MMC or LMC with xactmeasure when dimension true position. Program seems to be running fine without the conditions, but obviously want to get the bonus and match print.

Any help would be greatly appreciated.
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  • Basically, you do it the exact same way as for slots. Datum A might be hard to do "correct" as it should be made as a width with (M) applied. Datum B is the same but easier as the (M) is left out, meaning we can use a symmetry plane or line as datum. We can use the width as a generic circle diameter to calculate bonus for datum A, but if we assign a datum to this generic circle, we lose the datum freedom control since datum A should be a line or a plane. Hopefully someone can chime in with other construction ideas.

    Maybe it would be wiser to ditch the (M) completely on datum A and use the datum without (M) which would mean correct datum usage minus the bonus=tougher tolerance?
  • in reply to vpt.se
    I'd use it without the MMC modifier and then put in a note in my insp rpt to state that bonus tolerance is not being computed by the software but based upon "X" measurement, there may be some that can be assessed to this reading
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