I am trying to set up a quick program to measure a true position call out for a part we are running at the shop. it is a small bushing and the TP call out is the O.D. cylinder to the I.D. cylinder (datum A) and a perpendicular plane (datum B) I have no CAD model for this part so I need to program it without the CAD. If I try to make an alignment my machine won't run the program and an error reading "part is out of Z stroke" or something pops up. so I've tried to get around it by just fixturing the part in the same position and running without an alignment.
doing this I have to take points and then construct datum B as a plane but when I go to dimension the GD&T in a AB priority it wont let me create it with an error that reads "B does not constrain any degrees of freedom".
if I switch it to a "B" "A" TP I get no errors at all but Since that is not how the print calls it out I am unsure if that is incorrect for what I am trying to achieve.
Can anyone lend me some advice on what I may be doing incorrectly?
Make sure your clearplane or move increment doesn't go more than the CMM's range.
Manual mode:
Level to Z-plus if the plane is pointing up & Z origin on the same plane.
XY origin in the ID.
DCC:
Same thing but with more points.
I would used as datum only the ID to check position & then perpendicularity of the OD separately to the same ID.
Don't take engineering as a face value these folks rarely bother to learn anything more than minimum about GD&T thing.
Make sure your clearplane or move increment doesn't go more than the CMM's range.
Manual mode:
Level to Z-plus if the plane is pointing up & Z origin on the same plane.
XY origin in the ID.
DCC:
Same thing but with more points.
I would used as datum only the ID to check position & then perpendicularity of the OD separately to the same ID.
Don't take engineering as a face value these folks rarely bother to learn anything more than minimum about GD&T thing.