GD&T Composite Positional Tolerance (Patterns)

[jonglows]

I have two brackets aligned vertically with two holes on each. For this example I'm using a composite tolerance where the 0.8" position locates the overall position of the holes (relative to datums not shown) and the 0.25" locates the position of the holes relative to each other. I'm wanting to further refine this pattern tolerance to allow more variation in the vertical direction than horizontal, effectively creating an elliptical tolerance zone as drawn in the attached image. Is this possible?

 

[Belanger]

Are you using ASME or ISO dim/tol standard? Your current callout might be halfway to doing that (we can discuss orientation vs. location, and composite vs. single-segment).

John-Paul Belanger
Certified Sr. GD&T Professional
Geometric Learning Systems

 

[jonglows]

ASME, currently don't have any basic dimensions to make a multi single element tolerance

 

[Belanger]

There must be basics (either shown or embedded in CAD) though, to establish the location which the upper number of 0.8 is controlling.
You could then change it to two single segments (two position symbols) and perhaps achieve what you want. And it wouldn't really be elliptical but more of a hot-dog elongated shape that the two zones sweep.
Or is your intention something further, where you want to disconnect the two holes from each other?

John-Paul Belanger
Certified Sr. GD&T Professional
Geometric Learning Systems