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A-c datum alignment

Shane-o
Opinion needed:

Was wondering if it was possible for one of these holes (dat-c-) to give good t.p readings. Since the parts is symmetrical all 3 holes should be used with dat-a- for an alignment (a-c in feature control frame). So it would be possible for a different selected hole to be dat-c- and give out of tolerance true position readings. Correct?
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  • That was my initial thoughts but I'm trying to think of it in terms of a hard gauge.

    I see no scenario with a hard gauge where you'd get a different pass/fail depending on which hole you put a mating part in first.

    Your hard gage should have 3 fixed pins that you have to insert at one time, not one at the time

    I know this is older, but I would like to get a little clarification on this. I would tend to be in the minority here I guess and would have thought that even though the datum is anchored to the 12 o'clock hole, that the "3X" would have implied that the bolt circle itself would have been Datum C. This is how I would have(and have in the past) handled this. If this is wrong, I guess I need to correct my process
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  • That was my initial thoughts but I'm trying to think of it in terms of a hard gauge.

    I see no scenario with a hard gauge where you'd get a different pass/fail depending on which hole you put a mating part in first.

    Your hard gage should have 3 fixed pins that you have to insert at one time, not one at the time

    I know this is older, but I would like to get a little clarification on this. I would tend to be in the minority here I guess and would have thought that even though the datum is anchored to the 12 o'clock hole, that the "3X" would have implied that the bolt circle itself would have been Datum C. This is how I would have(and have in the past) handled this. If this is wrong, I guess I need to correct my process
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