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Asme y14.5-2009

acgarcia
Good Morning,

Where does it state in the standard ASME Y14.5 that the tolerance in the feature control frame is that total tolerance and not ± tolerance? I have a drawing that calls for cylindricity at 0.0005" but I over heard the engineers talk and mention that its ±0.0005" with a total of 0.001".
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  • It may come down to how they are "picturing" it. There is a .0005 tolerance all around the cylinder. So there is .0005 on one side of the diameter and .0005 on the other side of the diameter. That give a total of .001 variation as a diameter, which is how some people think about roundness or cylindricity, not saying that is correct.

    Section 5.4.4 has a nice NOTE: "The cylindricity tolerance is a composite control of form that includes circularity, straightness, and taper of a cylindrical feature" - in other words, it ain't just about the diameter.
    Sunglasses
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  • It may come down to how they are "picturing" it. There is a .0005 tolerance all around the cylinder. So there is .0005 on one side of the diameter and .0005 on the other side of the diameter. That give a total of .001 variation as a diameter, which is how some people think about roundness or cylindricity, not saying that is correct.

    Section 5.4.4 has a nice NOTE: "The cylindricity tolerance is a composite control of form that includes circularity, straightness, and taper of a cylindrical feature" - in other words, it ain't just about the diameter.
    Sunglasses
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