Circularity Tolerance--Controlling Ovality, Lobing and Irregularities Independently
Circularity Tolerance--Controlling Ovality, Lobing and Irregularities Independently
(OP)
I need to control the shape of a hole, so naturally GD&T should be applied. Based on our requirements, we are able to accept a more oval or lobed hole, but profile irregularities need to be strictly controlled as they will affect the performance.
Since Circularity controls all 3 together, is it permissible (and best practice) to define a circularity tolerance of x and also apply a profile-of-a-line tolerance, y, to ensure a smooth profile? Where y << x.
Since Circularity controls all 3 together, is it permissible (and best practice) to define a circularity tolerance of x and also apply a profile-of-a-line tolerance, y, to ensure a smooth profile? Where y << x.





RE: Circularity Tolerance--Controlling Ovality, Lobing and Irregularities Independently
RE: Circularity Tolerance--Controlling Ovality, Lobing and Irregularities Independently
..sorry, should have included that detail from the beginning.
RE: Circularity Tolerance--Controlling Ovality, Lobing and Irregularities Independently
Profile controls circularity.
You would apply profile and circularity, because you need the circularity to be very much tighter than the profile. You wind up with a very round hole, with a diameter and location not nearly as well controlled.
I think btrueblood's suggestion is closer to what you want. I don't see anything about profile or circularity that lets you specify it over a unit of length.
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JHG