Cylindricity : Combination of straightness + Circularity?
Cylindricity : Combination of straightness + Circularity?
(OP)
Hi All,
One basic question, if a shaft is called for circulaity tolerance of 0.1mm and staightness called out for surface elemnts which is also 0.1mm, then can I replace that with a single callout of cylindricity? Does both give the same results?.
One basic question, if a shaft is called for circulaity tolerance of 0.1mm and staightness called out for surface elemnts which is also 0.1mm, then can I replace that with a single callout of cylindricity? Does both give the same results?.





RE: Cylindricity : Combination of straightness + Circularity?
Imagine a perfect cone. All linear elements of its surface are straight, all elements in each cross-section are round (circular), but the cone is not cylindrical.
There is one aspect of cylindricity that is not covered by combination of roundness and straighntess - it is a mutual parallelism of diametrically opposed linear elements of feature's surface.
RE: Cylindricity : Combination of straightness + Circularity?
RE: Cylindricity : Combination of straightness + Circularity?
RE: Cylindricity : Combination of straightness + Circularity?
RE: Cylindricity : Combination of straightness + Circularity?
You are correct that a cylindricity tolerance controls circularity, straightness, and taper, but we use that last word in the sense that it prevents (or limits, within the given tolerance) the taper.
John-Paul Belanger
Certified Sr. GD&T Professional
Geometric Learning Systems
http://www.gdtseminars.com
RE: Cylindricity : Combination of straightness + Circularity?
RE: Cylindricity : Combination of straightness + Circularity?