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GD&T measurement error

Good afternoon all,

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?

Thank you.
Parents
  • Thank you all, I have figured out the issue. there was a yellow caution message stating datum A was a circle and would only measure TP in a 2D format so when I added the plane it was stating the TP was measured in 2d do to A but switching A to a cylinder fixed the issue and made the TP 3d.

    Thank you all for the help
Reply
  • Thank you all, I have figured out the issue. there was a yellow caution message stating datum A was a circle and would only measure TP in a 2D format so when I added the plane it was stating the TP was measured in 2d do to A but switching A to a cylinder fixed the issue and made the TP 3d.

    Thank you all for the help
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