I have a callout for a .250 dia. hole with the letters w.h. next to it can anyone please tell me what it means. The hole appears to have no functional purpose.
Yes there are datum targets and the fixture is designed to those basic dimensions with (note) 1/2" dia. gripper buttons. I question this but I also imagined that they would mimmick this situation on the CMM table but the part is upside down and they are probing the cast surface. We are getting...
Anyone with CMM experience please! Is it practical to probe a cast surface to establish Datum A. I am afraid this is throwing some numbers out of whack. I would think you would probe a truer surface and then set the part on that?
Here is a cross section of the tombstone. The bottom of the tombstone and the center of rotation which is the center bore in the bottom are critical. I want to control the tru position of the dowel hole pattern on the sides to these features. As it is I have my primary datum as A (the bottom...
The tombstone is square and the holes are on the faces. I'm looking to control the position to the bottom plane and the center axis of the tombstone most critically, but need a third datum to keep it from spinning ....maybe a second axis off center?
Checker
It's a four-sided tombstone ..also I thought I read somewhere that the primary datum should be perpendicular to the feature which is what I think you're saying ...is this true?
So I'm drafting up some process prints for a run of new tombstones we have in our shop. Aside from the surfaces being machined we are putting a dowel hole pattern on the faces. We are looking to control the location of these holes to the bottom and to the center of the tombstone, which I...
Can anyone please clarify if a perpendicularity call out is controlled by a basic dimension or not? In other words is the tolerance zone centered on a basic dimension?
