Contradicting drawing callouts

[PratikG]

Hello Everyone,

Please find attached screenshot of a stamping part. We are making a frameplate and there are two emboss on datumA. The flatness callout on DatumA is 0.3mm whereas the profile callout on the emboss is 0.1 to A,B and C. Is it possible to achieve the profile of 0.1mm of the emboss with reference to Datum A.

According to me if the profile callout of the emboss has to be achieved, The flatness has to be maintained within 0.05 which is not possible in mass production.

Is there any theoretical reference available so that i can convince the customer that the callouts of the profile and the flatness contradict

We are really stuck on the profile callout. Any help is highly appreciated.
Thanks in advance.

 

[3DDave]

Datum feature A is also defined by datum targets, not by the surface.

That is a conflict as the datum feature should not have two separate definitions.

 

[ewh]

The datum symbol can be used to clarify the datum defined by the datum points in other views, but as applied here it is more confusing than explanatory. Flatness would not apply to the theoretical datum plane, which makes the drawing ambiguous.

"Know the rules well, so you can break them effectively."
-Dalai Lama XIV

 

[3DDave]

Maybe the standard needs to fix that. It would be trivial to use [A1,A2,A3] as the datum feature reference and in datum feature symbols.