Cylindricity
by Mike Hurst on 09/29/05 at 14:36:57

I have a print that has a callout for .0001" straightness and .0001" roundness on a diameter.

Would this be the same thing as .0001" Cylindricity?

Re: Cylindricity
by Robert Fogt on 09/30/05 at 00:16:48

I believe the straightness requirement is the same as cylindricity.

Cylindricity would be placing a perfect cylinder on the inside curve and a perfect cylinder on the outside curve, with the cylindricity being the distance between them. As in this definition:
http://www.taylor-hobson.com/faqrounddetail.asp?faqid=45

You would pretty much do the same thing for straightness, but the roundness requirement sounds like making it perfectly round, which is not part of the cylindricity definition.

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