Measuring shaft bearing journal OD

[eaglet]

We currently use mechanical snap gauges when trying to measure the OD of shaft bearing journals. After conducting a gage R & R, we found that well over 30% of our bearing journal tolerances are consumed by error in measurement. Has anyone been successful with any other technology. Our runout tolerance is +/-.001 TIR.

 

[electricpete]

I am curious, what is R&R?

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[McLeod]

eaglet - Laser micrometers have repeatability on the order of ±0.0006mm, or approx. ±0.000025 in.

electricpete - "Repeatability and Reproducibility", which is rather misleading, since the values in an R&R study actually represent error...