So I have a cylinder with a vector facing the Y axis and a plane facing Z plus. Xplus workplane. When I dimension they distance of the cylinder to the plane I get a deviation of 0.0012". When I dimension the same features but with no radius op tion by deviation is 0.0000". Why do they not match?
The first option is to the centre of the feature regardless of the feature size.
The second option is dependant on the feature position and size.
So as example if the position was plus 0.001 and the diameter plus 0.002 the result would be perfect distance when calculated against the nominals.
Is it reasonable to dimension the distance between a cylinder and a plane ?
The dimension is the distance between the centroid of the cylinder and the plane, along the vector plane.
There is no reason that the plane and the cylinder axis are perfectly parallel, so if you change cylinder hit ,you change the centroid then the distance changes also !
Just a thought...
Henniger123,
UKCMM , we are maching some parts and the operator is adjusting a boring bar that "shouldn't change position" to fix the diameter of the cylinder. As he makes adjustments to the boring bar, the position of the cylinder changes against the plane. So the operator has to adjust the position of the boring bar as well as the size for the boring bar to cut. The machinist is telling me that he shouldn't have to adjust the position of the boring bar just the size. The boring bar is suppose to cut at the same position. So when we have an oversized cylinder and he adjusts the size of the boring bar for the next part, the deviation of the center of the cylinder to the plane moves out of tolerance when he says it shouldn't.
So I'm trying to understand the 2 dimensions to see what is going on.
The distance between a center point and a plane should not change when you change the diameter.
Therefore, I think, as others have already stated, that there are some problems with the measuring program or the manufacturing process
Would you please sketch this problem so that it can be better visualized?
Your current measurement program code would also be extremely helpful to understand why there is a deviation of 0
