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Thread: True Position of a diameter back to 2 datums.

  1. #1
    Associate Engineer
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    Nov 2013
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    True Position of a diameter back to 2 datums.

    How can I calculate the true position of a hole back to 2 datums (diameters). The feature control frame states that the true position of the hole should be within a diametrical tolerance of .5 MMC to datum "A" at MMC and datum "B" at MMC. I understand the calculation when going back to a single datum.

  2. #2
    Administrator Kelly Bramble's Avatar
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    Feb 2011
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    Bold Springs, GA
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    The tolerance zone is oriented and located to the specified datums'. So, depending on the relationship between the datums and the hole one will either measure a location (distance) or an orientation.

    Can you be more specific on what the relationships are between the hole and the datums'?

  3. #3
    Administrator Kelly Bramble's Avatar
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    Feb 2011
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    Bold Springs, GA
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