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Does anyone know of a quick way to measure bearing diameters on a shaft while it is still in centers on a grinding machine? To add a little complexity, the ranges of the OD of the journal can range from 1.5" to 4.5" with numerous sizes in between. The tolerance on these bearing journals is +/-...

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...

The test that we are doing is a production test for insulation resistance. It involves submersing an encapsulated stator in a tank of water for 24 hours. We do a Meggar test at 1 hour and at 24 hours for ten minutes. We all so do one minute test every hour. If the reading falls below 100...

Is anyone familiar with the navy's water test for encapsulated stators per Mil-m- 17060E. We have several large motors that we are having problems passing the resistance check.

Thanks to everyone for their input. I am going to use a coupling with a single split on one side. I am also looking into purchasing some smooth, mild steel chuck jaws.

I am designing a brass split coupling to be used in a four jaw chuck to prevent damage to a shaft from the jaws while the shaft is being turned. The OD of the shaft is 2.5590 +/- 0.0001. If I am going to make the split in the coupling 0.125, will it be okay if I make the ID of the coupling...

Does anyone no where I can find a good listing of causes for spikes I see at different frequencies of airborne noise testing of AC motors. I know that certain problems manifest themselves at various frequencies, such as fan problems, electrical noise, bearing problems,..etc., but I have been...

We are finding current imbalance of up to 7% in several motors on our test stand. The strange thing is that the imbalance is only seen in one of the windings. If we were having a problem with our power supply, wouldn't we be seeing the imbalance in both windings? Any suggestions as to what...