Parallelism per X

[[Ri...]]

Is there a way to report parallelism per X?
Like Flatness Ref per 12.00" (Inches).

[[Jo...]]

Out of curiosity, What are your features ? If angularity (parallelism) is a boundary zone at implied angle, wouldn't it take into account all form deviation ? I'm not understanding how you would parse the reference lengths.

[[Mi...]]

I can't quite figure this out in my head, but if you:
1) made an alignment to your datum
2) defined the feature of interest (a plane?) with respect to that alignment
3) then constrained the normal so it always evaluates parallel to the datum
...then would reporting flatness get the same results as reporting parallelism?
If so you could use flatness ref and get the result you want.

[[Ri...]]

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This is a very large parallel, 72 inches, Its manufacturer states parallel and flatness 0.0001 per 12".
So I'm trying to figure out how to report parallelism considering it uses the entire surface, not per 12".

[[Er...]]

Maybe scan the plane with high density points over the 72 inches. Then create additional planes selecting a group of points, in approx. a 12" square, and repeat this moving every inch or two. Check the Parallelism of these recalled planes and evaluate it to .0001." It would be a lot of tedious programming, but would satisfy your customer's requirement.

Is there an indicator accurate enough to set it up and a surface plate and indicate the surface?

[[Er...]]

What I would do is use several scan paths in the plane to be measured.

Then create planes from it by recalling the different paths or whatnot with range limits when selecting the plane to be measured.