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Re: True Position Tolerance VS Callout Tolerance
Re: True Position Tolerance VS Callout Tolerance -- brice arnold	Post Reply	Top of thread	Forum

Posted by: traingdt ® 12/10/2005, 10:37:23 Author Profile Mail author Edit

The factor that the machine shop told you about is probably meant to convert diametrical tolerances to x-y tolerances, since that is what machines "think" in. But two points: first, I think the factor would be .0003535. This is calculated by assuming that the .001 position tolerance was a diameter; then cut that in half so the tolerance is now .0005 in any radial direction. Then use the Pythagorean Theorem to break that into vertical and horizontal components: .0005 = sqrt(x^2 + y^2). But the second point: realize that by doing this, they are cheating themselves out of a small portion of the tolerance zone. (Sketch a circular area and then a triangle from the center to the edge.) They are bounding themselves within a square zone that is inscribed within the full circle. But I suppose that's the tradeoff in converting back to x-y coordinates.

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Re: True Position Tolerance VS Callout Tolerance
Re: True Position Tolerance VS Callout Tolerance -- brice arnold	Post Reply	Top of thread	Forum

Posted by: randykimball ® 12/09/2005, 19:19:52 Author Profile Mail author Edit

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