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  1. #1
    Join Date
    Feb 2008

    Inspection question

    Hi, I'm new at this forum stuff but I thought I'd give it a try . I've always believed a round part could not be checked accurately for roundness solely with a set of standard mikes. My question is, I have a steel ring 26" in diameter. Can I check it's roundness just using a standard set of mikes? I thank you in advance for any replies.

  2. #2
    Join Date
    Sep 2008
    The short answer is no.


  3. #3
    Join Date
    Apr 2004
    Hi Lee

    I think the best you could do with a micrometer is get a rough guesstamate of the rings roundness, ( max. - min. dia. )/2. This sort of thing is what CMM's are great at by the way.

    From an old out of date CSA GD&T standard, ( don't imagine this stuff changes too often ),: " The roundness tolerance refers to the width of an annular tolerance zone, bounded by two concentric circles in the same plane, within which the periphery of the feature in that plane shall lie. The roundness tolerance must be half the size tolerance except for parts subject to a "restrained specification". "

    Hope this helps.


  4. #4
    Join Date
    Sep 2008

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