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  1. DaveBNY

    Correct Method to Measure TIR

    If you have Datum A held by an expandable arbor how can you check Datum A, you have to assume Datum A is perfect correct? Also. from what I have been able to determine, a CMM cannot check TIR correctly, so that method is out. I just want to make sure that the parts are good. We have been...
  2. DaveBNY

    Correct Method to Measure TIR

    Datum A is one ID, Datum B is the other ID, each being a cylinder about .200 long in the ID. The OD is not a Datum.
  3. DaveBNY

    Correct Method to Measure TIR

    No please, be nit-picky. I don't want to leave out a detail and get the wrong information. Here is how it is on the print Sorry for the large size. This is Datum B. The ID's are .7500 =.0002 - .0001, the OD is 1.500 +- .001
  4. DaveBNY

    Correct Method to Measure TIR

    Hello, I have a question regarding the correct method to measure TIR on 2 ID's of a cylindrical part. From what I was taught and from what I believe is defined in ANSI Y-14.5, the correct way to measure the TIR on such a part is to place the part in a V-Block with an indicator on each ID and...

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