Beginner question cylindricity GD&T
Beginner question cylindricity GD&T
(OP)
Hello,
Very beginner question but say I were to dimension an O.D. diameter with a strict tolerance, e.g.: Ø60 +/-0,02.
Would it then be redundant to add a, for example, 0,03mm cylindricity GD&T tolerance to this diameter?
Very beginner question but say I were to dimension an O.D. diameter with a strict tolerance, e.g.: Ø60 +/-0,02.
Would it then be redundant to add a, for example, 0,03mm cylindricity GD&T tolerance to this diameter?
RE: Beginner question cylindricity GD&T
I don't thing so. Since the cylindricity is also about concentricity of multiple circular cross sections, not only about the diameter dimension, it would not be redundant from my point of view. Hope this helps you. However, a question would hang in the air: why not add only a cylindricity tolerance equal to 0,02mm?
Best regards,
JeSuisPasBourbaki
RE: Beginner question cylindricity GD&T
Thank you for the reply. The 0,03mm cylindricity tolerance was purely an example. The Ø60 +/-0,02 dimension would give absolute values of either Ø60,02 or Ø59,98. The cylindricity GD&T of 0,03 would mean the entire cylinder can have an unroundness of either Ø60,03 or Ø59,97. So my guess would then be that the cylindricity GD&T would be redundant. But I'm not sure if I'm correct in this assumption.
RE: Beginner question cylindricity GD&T
RE: Beginner question cylindricity GD&T
Cylindricity is controlled by your diameter tolerance. You apply cylindricity when you have a sloppy diameter, but require something accurately round. In forty years doing mechanical design and twenty years trained in GD&T, I have never applied cylindricity.
--
JHG
RE: Beginner question cylindricity GD&T
What this means is that your dimensional tolerance example means the cylinder can be true, but can have a range of allowable diameters. Adding cylindricity means that the toleranced surface can only vary within the cylindricity tolerance from a true circle - over its entire length.
Converting energy to motion for more than half a century
RE: Beginner question cylindricity GD&T
The only way this can be measured is on a roundness checking machine.
Hence circular (aka roundness) tolerance depends...
A UK 50p coin is a seven-sided equidiameter figure https://en.m.wikipedia.org/wiki/Fifty_pence_(Briti...)
Politicians like to panic, they need activity. It is their substitute for achievement.