Line Profile and Bestfit

[John Riggins]

Hey Folks,
I have posted about this before, but I am still a bit unsure of how I am dimensioning this.

See the attached:





My question: Should I be bestfitting using the Z axis or something else?

[Wingman]

You want to use the Y workplane so you can get the deviation in the X and the Z.

[cmmguy]

You may not want to best fit at unless your FCF calls for it. What does the callout say about the profile. Bestfitting "jiggle-fits" the datums to minimize the error. If the profile has no datum reference, then bestfit in Y+(or Y-).

[Jan d.]

What C wrote. What does your FCF exactlt look like?

[Wingman]

You may not want to best fit at unless your FCF calls for it. What does the callout say about the profile. Bestfitting "jiggle-fits" the datums to minimize the error. If the profile has no datum reference, then bestfit in Y+(or Y-).

Certainly do this.
My response was based on the assumption that you 'wanted' to bestfit.

[John Riggins]

I think the values with the Z workplane bestfit are correct.
I don't believe this surface is as good as the Y bestfit makes it look.



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