Aperture true position
Aperture true position
(OP)
Hi all - I wanted to get your take on how you may go about GD&T of an optic/aperture. Let's assume I have a square optic/lens that is 1" x 1". It is too difficult to achieve a clear aperture over the entire 1x1 face so let's assume that the clear aperture must be centrally located in the 1 x 1 square. The clear aperture will need to be .8 x .8.
So my question is...is it even possible to control the location of the clear aperture via GD&T? Keep in mind the clear aperture is just a surface within the 1 x 1 square, it is not a feature of size.
Curious if anyone has any thoughts.
Thanks
So my question is...is it even possible to control the location of the clear aperture via GD&T? Keep in mind the clear aperture is just a surface within the 1 x 1 square, it is not a feature of size.
Curious if anyone has any thoughts.
Thanks
RE: Aperture true position
RE: Aperture true position
RE: Aperture true position
RE: Aperture true position
RE: Aperture true position
A clear aperture, round or square, is a feature of size, and can be controlled by a positional tolerance. What is wrong with a profile tolerance? Read up on unilateral profile tolerances. You can precisely define your aperture keep-out
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JHG
RE: Aperture true position
RE: Aperture true position
RE: Aperture true position
I think you are correct about it. And neither limits of size nor position can apply. Not only that it's not a Feature of Size, it's not a "Feature" at all in the ASME Y14.5 sense. Correct me if I'm wrong, but it doesn't have distinguishable geometrical limits. It only has the limits that you prescribe so that certain evaluations need to be done in the area that is inside these limits.