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  1. StanBognatz

    Motorized Spindles / Ceramic Bearings - Vibration Comments Wanted

    We are analyzing some 24,000 - 30,000 rpm motorized spindles equipped with ceramic bearings that are classed at ABEC9. I don't have specific bearing numbers, don't know the DN#, or the specific type of lube being used (yet). The vibration data for the first few units we have looked at has what...
  2. StanBognatz

    Ceramic bearings / motorized spindles - noisy vibration signatures

    We are analyzing some 24,000 - 30,000 rpm motorized spindles equipped with ceramic bearings that are classed at ABEC9. I don't have specific bearing numbers, don't know the DN#, or the specific type of lube being used (yet). The vibration data for the first few units we have looked at has what...
  3. StanBognatz

    Any users of capacitive proximity transducers on rotating equipment?

    I'm looking for any feedback from users of capacitive proximity probes (e.g. Vibrosystm 'PCS' models) regarding their claimed insensitivity to electrical runout & surface magnetism variations. Has anyone done any direct comparisons of eddy current (Bently) vs. capacitive transducers to determine...
  4. StanBognatz

    Hydrogenerator Noise @ 720 Hz

    I've got a unique situation with a recently re-stacked hydrogenerator. Vitals are: # poles = 56 ; # stator slots = 360 ; line freq = 60 Hz ; rpm = 128.57 Old design had 4 stator core splits ; New design uses a continuous core stack Vibration taken directly from the back of the...
  5. StanBognatz

    Hydrogenerator Vibration & Noise

    I've got a unique situation with a recently re-stacked hydrogenerator. Vitals are: # poles = 56 ; # stator slots = 360 ; line freq = 60 Hz ; rpm = 128.57 Old design had 4 stator core splits ; New design uses a continuous core stack Vibration taken directly from the back of the...

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