How to program this datum?

I am lost trying to program datum A (see attached dwg).

As for datum B & C I used a line for each; although I am not sure if that's the best way to do this. The radius is not constant on the part, and there is also a sag in the middle. It is shaped somewhat like a saddle. The part has no planar surfaces with exception to the edges and the mat'l is .025" thk so probing accurately is difficult.

Any advise is greatly appreciated.

Attached Files

Parents

Colin Simithraaratchy over 11 years ago

Iterative alignment, pick the points from CAD, create them (do NOT measure them), create the iterative alignment, then measure. Repeat in DCC mode.

Matthew's right, you can't do it without a CAD model and knowledge of iterative alignments. We definitely don't discuss how to utilize freeformed datums in the PCDMIS Portable course, though it is possible.
Cancel
Vote Up 0 Vote Down

Sign in to reply

Cancel

Reply

Colin Simithraaratchy over 11 years ago

Iterative alignment, pick the points from CAD, create them (do NOT measure them), create the iterative alignment, then measure. Repeat in DCC mode.

Matthew's right, you can't do it without a CAD model and knowledge of iterative alignments. We definitely don't discuss how to utilize freeformed datums in the PCDMIS Portable course, though it is possible.
Cancel
Vote Up 0 Vote Down

Sign in to reply

Cancel

Children

No Data