coplanar profile of multiple surfaces
coplanar profile of multiple surfaces
(OP)
Attached is how my company is calling out a coplanar profile of three surfaces that are not in-line with one another. I am still learning ASME Y14.5 and wanted to ask if this is an acceptable way of doing this or if better methods exist. I have seen profile used to callout coplanar surfaces when they are in-line using a centerline attached to the surfaces and a profile callout but not sure if that method could be adopted in the attached scenario.
Thank you in advance,
Greg
Thank you in advance,
Greg





RE: coplanar profile of multiple surfaces
In the scenario you're talking about, it's a chain line, not a center line, that connects the surfaces.
John Acosta, GDTP Senior Level
Manufacturing Engineering Tech
RE: coplanar profile of multiple surfaces
I would like to probe this thread a little bit further (meant to include this in the beginning) - attached now contains to continuous feature callouts on both FOS dimensions. Now, in total, does the drawing specify the following: "The three feet can vary in size from nominal ±.005 simultaneously (using a common gauge) and their relative flatness to one another is allowed to vary ±.0005." Hopefully that made sense :] Like I said, I'm still learning and having trouble finding examples when surfaces are not in-line with one another.
Best,
Greg
RE: coplanar profile of multiple surfaces
"For every expert there is an equal and opposite expert"
Arthur C. Clarke Profiles of the future
RE: coplanar profile of multiple surfaces
John Acosta, GDTP Senior Level
Manufacturing Engineering Tech
RE: coplanar profile of multiple surfaces
The profile callout then states how much deviation is allowed between levels if they can't be perfectly coplanar.
John-Paul Belanger
Certified Sr. GD&T Professional
Geometric Learning Systems
RE: coplanar profile of multiple surfaces
Thanks,
Greg
RE: coplanar profile of multiple surfaces
John Acosta, GDTP Senior Level
Manufacturing Engineering Tech
RE: coplanar profile of multiple surfaces
"For every expert there is an equal and opposite expert"
Arthur C. Clarke Profiles of the future
RE: coplanar profile of multiple surfaces
Best,
Greg
RE: coplanar profile of multiple surfaces
RE: coplanar profile of multiple surfaces
Greg, if your intent is to also keep the three pads parallel to the bottom face within .001, then this will not do it.
Was that your intent from the start?
John Acosta, GDTP Senior Level
Manufacturing Engineering Tech
RE: coplanar profile of multiple surfaces
Greg
RE: coplanar profile of multiple surfaces
John Acosta, GDTP Senior Level
Manufacturing Engineering Tech
RE: coplanar profile of multiple surfaces
There would be a different way to allow a larger deviation in size while still maintaining a tighter parallelism than what you suggested but since that wasn't your goal, I won't address it.
John Acosta, GDTP Senior Level
Manufacturing Engineering Tech
RE: coplanar profile of multiple surfaces
I just meant that (at least to me) it is unclear what exactly is controlled by the .750 +/-.005 dimensions. If 3 pads are functional primary datum features, the most unambiguous way to control bottom face is to change the dimension to basic .750 and apply profile callout to control locaction of that face relative to the primary datum plane A. If additional orientation control is needed, parallelism tolerance wrt A should be applied as a refinement of profile tolerance.