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Ovality of an hole

  1. Mar 26, 2015 #1
    Can anybody guide me what basically is the formula for finding ovality for a circular hole of given dimension and tolerance? I think it would be (Upper tolerance limit + Lower tolerance limit)/2. But not able to find any reference for the same.

    Please also give reference for the same if possible.

    Thanks in advance for any help.
  2. jcsd
  3. Mar 26, 2015 #2

    Simon Bridge

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  4. Mar 27, 2015 #3

    Ranger Mike

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    i suggest you look into ANSI B 89.3.1 standard on measurement of out of roundness. Basic definition is maximum radius - minimum radius = out of round condition.
    You ca n not define a inside diameter or outside diameter with any type of diametric check ( caliper or micrometer measurement or use of v-block and dial indicator.
    tolerancing is a whole other matter so refer to ANSI Y 14.5 standard on Geometric and Dimensional Toleranceing
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