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Clearance Envelope

apgar
How do you check Clearance Envelope (CL ENV)?
We have a certain customer that uses CL ENV quite a bit. Their spec says "The term CL ENV shall be interpreted as a dimensionally-established boundary beyond which no portion of the affected feature shall extend; for instance:
Where related to an internal feature such as an ID or a slot, it is an envelope (enclosed by the feature) inside of which no portion of the feature shall extend.

With the part I am looking at we have a 3.900 ID with a 3.850 CL ENV. If the ID checks out okay to a position of .050 are we good?
thanks,
eric
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  • NO, Matt does NOT need any more expansion......

    If you take a 4-hit circle, you have no way of knowing the entire roundness of the circle, it could be a whacked shape, and not a round circle, if any part of the circle violates that CL ENV, then the hole is no good. The only way to be sure of that is to scan the circle. If you are using least-square, 4-hit circle for a 3.900 hole, and it's an oval that is 3.800x4.000 (and the hits are at the right places) you will see an 3.900 circle, but it violates the CL ENV.
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  • NO, Matt does NOT need any more expansion......

    If you take a 4-hit circle, you have no way of knowing the entire roundness of the circle, it could be a whacked shape, and not a round circle, if any part of the circle violates that CL ENV, then the hole is no good. The only way to be sure of that is to scan the circle. If you are using least-square, 4-hit circle for a 3.900 hole, and it's an oval that is 3.800x4.000 (and the hits are at the right places) you will see an 3.900 circle, but it violates the CL ENV.
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