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Composite Tolerance

Lukas
​

I am having trouble understanding composite tolerance, especially when it comes to a bolt hole pattern like this. I am wondering how you would dimension these true positions. Here's my idea using legacy dimensioning:

Level and translate to A, rotate to B, and report the position of 1 hole (any hole?...lets say the 12'O'Clock hole) and give it a .001 tolerance. Then, would I stay leveled to A&B, translate to the hole that I just reported on (12'O'Clock hole), and report the positions of the rest of the holes with a .0005 tolerance?​

Thanks so much...I prefer to use legacy...
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  • this right?

    to the book example:
    the upper tolerance zone can't rotate or translate.
    the lower tolerance zone can't rotate, but is allowed to translate (within the confines of the upper)
    the actual feature can rotate and translate as long as it is within the confines of both tolerances

    if the lower was to AB the smaller tolerance could rotate with respect to C (but needs to stay within confines of upper)




    Book example says Rotate only for the lower segment. Book is 2009 version
    I like to imagine a hard gage when I'm trying to understand a GD&T Position callout. Having a tough time with this one. Lack of imagination, maybe?
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