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Thread: How do I measure this datum location?

  1. #1
    Associate Engineer
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    Dec 2013
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    How do I measure this datum location?

    I have 6 cored holes with draft on bolt circle. 2 of them are datums B & C. The other 4 are toleranced as normal.
    The 2 datum cores have a datum target point or points inside them, at a basic height off the Datum A face. (One core is round, the other oblong)
    I am wondering how to measure the size of the cores - we usually just use a plug gage, but do I need to taper it for a go/no go at this line? (like a gauge line)? I can attach a print view of one.
    Thank you!

  2. #2
    Administrator Kelly Bramble's Avatar
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    Welcome to the EE!

    It would be better if you posted an image of the geometry and dimensional specification.

  3. #3
    Associate Engineer
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    Dec 2013
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    Thanks for replying Kelly. That is the detail for this core. Only other place shown on the print is the main veiw showing the bolt circle.

  4. #4
    Associate Engineer
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    I am new to the forum. Where you able to view the print detail of the core? I did attach it. I do not see it as attached, but it appeared I did it correctly

  5. #5
    Associate Engineer
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    Dec 2013
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    datum_core.jpgTried again, here it is!

  6. #6
    Administrator Kelly Bramble's Avatar
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    QEng, to measure do one the following:

    1) Use a micro-height or equivalent with the right length stylus to measure the size at the specified location. Then measure the angle - measure at several locations.

    2) CMM - nothing more to say here, easy money.

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