I have a bore that is Datum B. It has a perpendicularity callout to Datum A, which is a flat surface. So, I have to measure it as a cylinder. I have another bore that has a circular runout callout to AB. So do I have to measure B again as a circle? Because I would have to assign that as another datum to build the feature control frame. But if I just use B as a cylinder, then wouldn't it be measuring total runout and give me a different result than circular runout?
basically think of it as if you were to measure it with an indicator. you would put something cylindrical in to datum b and rotate around that while measuring the runout of A. But if your runout is drawn to a cylinder then you need to measure it as such. a circle does not have a center axis. Runout is the high to low point deviation of the surface elements relative to a datum Axis.
basically think of it as if you were to measure it with an indicator. you would put something cylindrical in to datum b and rotate around that while measuring the runout of A. But if your runout is drawn to a cylinder then you need to measure it as such. a circle does not have a center axis. Runout is the high to low point deviation of the surface elements relative to a datum Axis.
