Weird Line profile tolerance

[[Wo...]]

A question for GDT gurus here - does this look like correct callout? I've never since a line profile tolerance like this:

Any ideas if this is legal? And measurable? I kind of think someone meant straightness.

Thanks

EDIT: Forgot to mention - the print is to ASME Y14.5-2009 and the dimension line points to an OD of a shaft.

Edited September 26
additional info

[[Ma...]]

As you mentioned - it's like straightness.

But here you have to fulfill line profile on any section with length of 30mm ( i am not sure if it's 30inch ).
Most of the time you have higher tolerance on whole profile and this type with smaller tolerance on shorter lenght of profile.

On newer versions of Calypso there can be this characteristic.

You can look at this as "Flatness with ref" where you calculate flatness just on defined size, but you place infinite of them to get the worst value.

[[Ri...]]

I have found that the legacy Profile of Line Reference does not compute correctly. It still evaluates the entire length, and then just chops it up into segments, which is not how the Straightness Reference is handled at all.

To do it correctly, you should just measure the curve segments independently, and just use a max result element or depending on the shape you have, you might be able to just measure it as a line, and use the Straightness Reference. 

[[Ri...]]

Straightness per unit length - TES-technologies

The above may help.

[[Wo...]]

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I will try to do that. Not sure if I understand it correctly, but measuring straightness alone could be sufficient because there are no datums involved? Otherwise the distance in/out of the material would also play o role?

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Thank you for that. I do understand straightness (maybe not as in-depth as shown in the link), but the profile tripped me up.

[[Ri...]]

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 It all depends on the shape of the surface you are doing the Line Profile on. For example, I've seen this applied to an ID/OD cylinder, where a simple 2d line trace, and then Straightness would work perfectly - even if the surface was a singular cone that would work as well. I've also seen it on an OD that hand multiple taper transitions, so in that case it wouldn't work very well as you have angle changes that would impact the Straightness.