Okay all you GD&T gurus, can you help me interpret the positional callouts on this print?
It's a sheetmetal stamping with PEM studs in two of the holes. It seems as though it's not complete, but I'm not sure.
Any help is appreciated.
It appears that the 2 studs must be in relationship to each other and also perpendicular to datum A to become datum B. The only problem that I have with it is the fact that both studs become datum B rather than the single stud as shown. Usually, 1 hole or stud becomes a secondary datum rather than 2 studs. Other than that, it is OK.
If I were measuring the stamping, then I would use the same feature control frame and data although the print notes that assembled stud. The stud can only follow the hole location.l
If this doesn't answer your question, please let me know.
PS - I have been in GD&T training for over 20 years and am a ASME certified GD&T professional - Technologist & Senior so I have been around the block a bit on GD&T.
Calypso should probably spit that out. My best guess on how to inspect it would be to use datum A as your spatial alignment, pick one of the studs or the hole before it's welded as one of the points(likely making it the origin), and do a special alignment to rotate the other stud to position in X, Y, or Z.
If there were callouts referencing [A|B] and their basics were shown relative to on stud or the other you could move reference one half the basic spread and measure from that reference or just leave the reference at the center of the pattern and adjust the measured value by the rectangular X-Y displacements of half the basic spread at the specified angle of the spread. Making one stud secondary and the other tertiary makes sense only if they function that way (like if the mating part has a hole and a slot).
Paul
Do I use "Rotate by distance" in "special"? I tried that but end up with the alignment rotated by some strange angle.
<edit>
Wait....................had to rotate by only one axis. In this case X 126.75.