Tolerance Question

[spleen10]

I want to know how to tolerance the straightness of a bore in a shaft properly.

I thought it was cylindricity at first, but now thinking its concentricity to the outer diameter.

Any help, would be much appreciated.
Thanks

 

[KENAT]

You need to give a bunch of information on function/application etc. for anyone to be able to help you, and frankly forum1103 may be a better place to ask.

Concentricity actually has fairly limited application, one of the runouts is often a better choice or in many cases position is quite adequate.

Posting guidelines faq731-376

http://eng-tips.com/market.cfm?

(probably not aimed specifically at you)
What is Engineering anyway: faq1088-1484​

 

[Cockroach]

Yeah, concentricity means cylindrical bore OD to ID have identical centre lines to within tolerance.

Do you mean "TIR" or the included taper run out along the radius?

Kenneth J Hueston, PEng
Principal
Sturni-Hueston Engineering Inc
Edmonton, Alberta Canada