Runout includes profile?

[Belanger]

This is a two-pronged question for all of you regarding total runout...

First, I claim that total runout may be applied to a cone, IF the angle of the cone from the datum axis is given as a basic angle.

A colleague insists that it can't; his main evidence is that Y14.5 doesn't give an example of one (flimsy, eh?). But I point to paragraph 9.4.2.1 (of 2009 std), which glaringly omits "cylindricity" from the list of other characteristics covered by total runout. Thoughts?

Second, that same paragraph mentions "profile of a surface" as one characteristic that total runout may control. We know that profile of a surface must be applied to a true profile (meaning a basic diameter), but I maintain that runout tolerancing is not meant to control size -- the diameter of the part should not be basic. Though the standard doesn't say this latter item, I infer it because they make no mention of the dial indicator being zeroed at a specific distance from the datum. Thoughts?

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

 

[Belanger]

Yes -- the general agreement was that even though the standard doesn't show such an example, total runout on a cone communicates a certain idea that is valid. (And the inspector at the meeting didn't have a problem with it!)


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

 

[fsincox]

Thank you, John-Paul.
I recently have become the engineering rep. on my companies new GD&T committee. In that function, I saw that my company had a gotten a proposal from you for training. Say about a year ago, in the Northern Illinois area. I was disapointed as I recognized your name from here and would have enjoyed a chance to meet and talk with you in person.
Frank