surface finish question

If I have an ID that calls out for a ream of .4720+-.0005, would it be
posible for it to be inspected to a +-.003? I was asked to put this
runout on a drawing and I'm thinking at 4 places with a +- in 4 places
the ream would never be that loose.
Any one have something on this?
Thanks
Frank
Reply to
fmcdougle
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The purpose of the tolerance on the hole size is to ensure that you get = an interference fit on a 12mm pin. The purpose of the runout tolerance = (or profile tolerance) is to ensure that the mating part can line up = with the dowel, even if the hole is not perfectly straight. BTW, the = runout tolerance does not effect the size of the hole. So, no, I don't = think it's contradictory to specify different tolerances on size and = location/condition of the hole. Especially not when you're translating = from metric to US Customary (English, Imperial units, whatever you want = to call them) where a mere sixty-fourth tolerance takes 6 places to = express evenly.
David Janes
Reply to
Janes
snipped-for-privacy@l42g2000hsc.googlegroups.com...
interference fit on a 12mm pin. The purpose of the runout tolerance (or pro= file tolerance) is to ensure that the mating part can line up with the dowel= , even if the hole is not perfectly straight. BTW, the runout tolerance does= not effect the size of the hole. So, no, I don't think it's contradictory t= o specify different tolerances on size and location/condition of the hole. E= specially not when you're translating from metric to US Customary (English, = Imperial units, whatever you want to call them) where a mere sixty-fourth to= lerance takes 6 places to express evenly.
OK David, thanks for getting me thinking right again.
Frank McDougle
Reply to
fmcdougle

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