Got a part with a lager Id bore that is datum b. Going into the part morr is a smaller bore with a position of .003 to b.
So my fcf used the drf to control it. Well the report does not show x and z as zeros. Engineering says datum b is zero so the report has to show everything as zero. So I did an alignment using just datum b( center line of the cylinder) the report show zeros but bad position and does not repeat. What am I missing
What is the length of Datum B? How are you aligning? Are you Leveling to the Axis and Origin, what stops rotation? How far linearly is the measured feature to Datum B
Datum b is .50 imchs. My Original alignment was based off of the drawings a b and c datums. My feature control frame was using a b n c as a data reference feature. My future control frame was a true position to threecell at b. I created b as a datum off of the center of that cylinder. Engineering disagreed with the way I have that aligned. They want to see datum b as an alignment to itself. It is not leveled. It has nothing controlling rotation.
As long as datum -B- is measured as a 3d feature, you should be able to level to it as +Z and set both the X and Y origins to it. Since the measured feature will be coaxial to -B-, in theory, you do not need a rotational lock (X = 0; Y = 0). You will, however need a rotation for reference if you expect to be able to adjust based on the results.