Circular runout normal to datum axis
Circular runout normal to datum axis
(OP)
We have a barrel shaped part about 20 inches in diameter with a one inch wide flange around the perimeter perpendicular to the barrel axis. The GD&T callout on the flange is circular runout (not total) to the axis of the barrel. In other words perpendicular runout. The shop has been checking this by placing an indicator on the flange tracing a single track close to the barrel and rotating the part on the barrel axis. The part is OK. Inspection has found that if they choose a single circular element track further away from the barrel, which is interrupted, the part is out of tolerance. The B/P does not specify where on the flange to place the circular element track. The question is, do both of the single circular element tracks have to be within tolerance? GD&T 1987 applies.





RE: Circular runout normal to datum axis
BTW, I'm not sure which standard "GD&T 1987" refers to. There was ANSI Y14.5-1982 and ASME Y14.5M-1994.
Evan Janeshewski
Axymetrix Quality Engineering Inc.
www.axymetrix.ca
RE: Circular runout normal to datum axis
Powerhound, GDTP T-0419
Production Manager
Inventor 2009
Mastercam X3
Smartcam 11.1
SSG, U.S. Army
Taji, Iraq OIF II
RE: Circular runout normal to datum axis
Powerhound,
if you get a flight safety alert on one of your favorite helicopters you will already know what it's about.