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Re: TIR vs Concentricity

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Posted By<" ">Randy on March 02, 2002 at 19:21:12:

In Reply to: TIR vs Concentricity posted byE. Northcutt on February 13, 2002 at 12:41:29:

: Our engineering group has a controversity over when to use TIR tolerance and when to use concentricity.

: Anyone who can help to settle the controversy?
: I appreciate your comments.

A really basic answer... if you wish. ( I don't know your situation )

TIR is total indicator reading and will show twice the run-out.
Concentricity tells us about what the actual run-out is off center line.
Seeing how you most likely will check run-out with a dial indicator concentricity would be a bit pointless, unless you are using a CMM and/or checking odd shapes as in landing gear trunions.

any help?

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