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Thread: upper and lower fitting issues

  1. #21
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    Quote Originally Posted by dwkfym View Post
    Here is an example.

    Say the mold was only accurate to +-0.02" (Just example numbers here)
    The calipers were calibrated and rated to be accurate to +- 0.01"
    Then say my CNC machine will machine parts to 0.02" accuracy.
    Then the dimensions of my finished part may be up to 0.05" off. Because the tolerances were stacked.

    Theoretically that doesn't mean the part will be off by whatever the total sum comes out to be (in this case, 0.05), but it can be that much off.

    /snip.
    That is actually a precision and accuracy issue. Tolerances are set in the engineering print and the part is either pass/fail per the drawing.

  2. #22
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    Quote Originally Posted by Tzed250 View Post
    That is actually a precision and accuracy issue. Tolerances are set in the engineering print and the part is either pass/fail per the drawing.

    Actually you are right. Apologies. That was a very bad and incorrect example. When I get back from the bar tonight, I will think of a better and correct one. lol
    Precision Delivery Systems (www.pdsrifles.com) Like us on Facebook
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  3. #23
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    No biggie, I deal with the issues daily .

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