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Straightness Tolerance Box

Straightness Tolerance Box

Straightness Tolerance Box

(OP)
Hello,

Today I saw a tolerance box for straightness which had a tolerance of .005/1 RFS.

I guess it means the part must be straight within .005 per inch. Does anyone know where in the ASME Y14.5 it allows this? I was unable to find it.

RE: Straightness Tolerance Box

See paragraph 5.4.1.3 of the standard ASME Y14.5-2009. Also see Fig. 5-4, which shows that "per-unit" idea as a subset of an overall straightness tolerance (although the overall straightness isn't necessarily required).

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

RE: Straightness Tolerance Box

Just a minor point, but that straightness tolerance likely applies to a specific surface or feature and not the entire part.

RE: Straightness Tolerance Box

(OP)
Yes, Thank you.

RE: Straightness Tolerance Box

This type of unit restriction can also be used with flatness. I've never seen it by itself -- always as a composite control with an overall tolerance above and a smaller unit tolerance below.

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