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Bad GD&T prints

Calvin.Korver
Link to print https://drive.google.com/file/d/1PPWkIpGwM39PPnNyxP7Zwe0Rr7QkaRxh/view?usp=sharing

Only sharing part of the print for nondisclosure purposes, but there was a lot wrong with it. Thought I would share this since it has been so annoying for me.

They put a position dimention on many of the faces when they clearly needed/wanted a surface profile.
They also had an M modifier on almost everything including: datums that are planes, flatness, and one distance dimension

Currently talking with my contact to see if we can get this straightened out.

Anyone else deal with some bad GD&T?
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  • Follow-up Post: I talked with the engineer and he thinks they do actually want the position dimension of the plain, even though I'm not convinced. I double-checked the print and it is to the ASME Y14.5-2009 standard. I don't think it gets any good data and I have been running the part and it says the planes are in the wrong spot along the plain getting numbers all over the place. Can someone give me a good resource as to what the true position of a plain is really measuring? Or what do tell the engineer bc I think you can only have this type of callout in some ISO standard.
    These parts are also getting a coating so I have added that to the tolerance already. I know that could be affecting the results, but the results still say its WAY out.


  • in reply to Calvin.Korver
    It depends on what version of PC-DMIS you are using. In earlier versions, position of a plane only checked the plane center point, meaning you can have a skewed plane (out of position) while the center point is OK... In newer versions (don't know the breakpoint) position for a plane is reporting correctly and shall display the same result as if you were doing surface profile of the same plane, with the same datums. You can always try it, report both position and surface profile for your feature. They should match, if they don't, I'd go with the surface profile result (assuming ISO).
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  • in reply to Calvin.Korver
    It depends on what version of PC-DMIS you are using. In earlier versions, position of a plane only checked the plane center point, meaning you can have a skewed plane (out of position) while the center point is OK... In newer versions (don't know the breakpoint) position for a plane is reporting correctly and shall display the same result as if you were doing surface profile of the same plane, with the same datums. You can always try it, report both position and surface profile for your feature. They should match, if they don't, I'd go with the surface profile result (assuming ISO).
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