Ok. We have all seen this. A print with a centerline call out that really only controls size and not location. Think of this as solid block with a U shape cut thru it. The entire U shape is severely tipped to 1 side. We almost have a this wall condition on side. The U itself has perfect size and form. . We are getting push back from another dept saying according to the print it is good to go! There is a note saying all undefined geometry is controlled at +/- .010 on the print and we also use an internal control that states +/-.10 on all undefined dimensions. This dept has never heard of that document for some reason. So I would say the shape itself needs to be within .010 of the C/L. Can everyone out there quote a standard that talks about undefined symmetry ? Y14.5 has nothing ( and I didn't expect it to ) . The drawing isn't referencing any other specs and it is an internal drawing so this is more of a dept vs. dept P!$$!NG match. I would like to win this war with a MOAB !
Ok. We have all seen this. A print with a centerline call out that really only controls size and not location. Think of this as solid block with a U shape cut thru it. The entire U shape is severely tipped to 1 side. We almost have a this wall condition on side. The U itself has perfect size and form. . We are getting push back from another dept saying according to the print it is good to go! There is a note saying all undefined geometry is controlled at +/- .010 on the print and we also use an internal control that states +/-.10 on all undefined dimensions. This dept has never heard of that document for some reason. So I would say the shape itself needs to be within .010 of the C/L. Can everyone out there quote a standard that talks about undefined symmetry ? Y14.5 has nothing ( and I didn't expect it to ) . The drawing isn't referencing any other specs and it is an internal drawing so this is more of a dept vs. dept P!$$!NG match. I would like to win this war with a MOAB !
You can usually reference an ISO DIN standard (or in Europe we do), there are separate tolerances for what kind of part it is, cast, machined etc. The only issue I have with using DIN standard tolerances is that they are very generous. I would guess there is an ASME equivalent but again it will probably have the same problem of being quite a large tolerance for what you do.
Unfortunately I don't have access to any at the moment so cannot provide you some values.
We always have an internal document like yourselves, or have it written on the drawing that all un-toleranced surfaces shall use these tolerances.
Ok. We have all seen this. A print with a centerline call out that really only controls size and not location. Think of this as solid block with a U shape cut thru it. The entire U shape is severely tipped to 1 side. We almost have a this wall condition on side. The U itself has perfect size and form. . We are getting push back from another dept saying according to the print it is good to go! There is a note saying all undefined geometry is controlled at +/- .010 on the print and we also use an internal control that states +/-.10 on all undefined dimensions. This dept has never heard of that document for some reason. So I would say the shape itself needs to be within .010 of the C/L. Can everyone out there quote a standard that talks about undefined symmetry ? Y14.5 has nothing ( and I didn't expect it to ) . The drawing isn't referencing any other specs and it is an internal drawing so this is more of a dept vs. dept P!$$!NG match. I would like to win this war with a MOAB !
You can usually reference an ISO DIN standard (or in Europe we do), there are separate tolerances for what kind of part it is, cast, machined etc. The only issue I have with using DIN standard tolerances is that they are very generous. I would guess there is an ASME equivalent but again it will probably have the same problem of being quite a large tolerance for what you do.
Unfortunately I don't have access to any at the moment so cannot provide you some values.
We always have an internal document like yourselves, or have it written on the drawing that all un-toleranced surfaces shall use these tolerances.
