Cylindricity Callout
Cylindricity Callout
(OP)
I currently have a part that has a an OD with a total tolerance of .0012. This same part has a cylindricity callout of .005 in the Free state. This is a thin wall part which tends to be out of round while machining it. It is my understanding that the callout for cylindricty needs to be smaller than the total tolerance of the feature.
To be honest I do not believe that the customer truly care if the part is out of round when it is sent to them as long as it is within .005 in the free state which is not a problem. However the callout on their drawing shows cylindricty.
Am I wrong in my thinking that the customers callout is incorrect? I have done a lot of research regarding this and just want to make sure I cover all avenues prior to asking the customer to change a print they have been using for years. Any help is greatly appreciated.
Jay
To be honest I do not believe that the customer truly care if the part is out of round when it is sent to them as long as it is within .005 in the free state which is not a problem. However the callout on their drawing shows cylindricty.
Am I wrong in my thinking that the customers callout is incorrect? I have done a lot of research regarding this and just want to make sure I cover all avenues prior to asking the customer to change a print they have been using for years. Any help is greatly appreciated.
Jay





RE: Cylindricity Callout
RE: Cylindricity Callout
John-Paul Belanger
Certified Sr. GD&T Professional
Geometric Learning Systems
RE: Cylindricity Callout
John Acosta, GDTP S-0731
Engineering Technician
Inventor 2013
Mastercam X6
Smartcam 11.1
SSG, U.S. Army
Taji, Iraq OIF II
RE: Cylindricity Callout
Frank
RE: Cylindricity Callout
Maybe I am misunderstanding that information but we have been shipping this part for years it just becomes a problem with certain inspectors who didn't understand the callout. I wanted to be certain I understood it before I go any further and this has helped me realize that the mentality here was incorrect and that the "customer is always right".
Thanks again for the help!