Part Tolerance

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    Question:  For a part tolerance of =/- .02, the gage must have a resolution of at least? 
    I am not sure of the answer, and really do not understand it.  Can someone help?



    The resolution should be at least 1/10 of the smallest unit of measure used or desired.
    i.e. if measuring in inches it should be 1/10 of an inch.



    This topic was discussed a few days ago. Note that “resolution” is not ussually what you have to look for. You can have a digital instrument with a reolution of 0.0001 where the last 2 digits do not repeat the value when you repeat the same measurement, so having another instrument with a resolution of 0.001 but whith a repetitive behaviour would be better even if the resolution is 10 times worse.
    As another one posted, the rule of thumb is that the width of the measurements distribution (not the resolution) should be 10 times better (nerrower) than the width of the variation of what you want to measure (that can be the width of the tolerance or the width of the process distribution)
    Have a look at this thread:

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