Gear reducers

Hi there,
Looking at your posts as a pair, I think you are not doing high frequency measurements at each bearing and not frequently enough.

That's why you are missing the failure signs.

We always do Velocity and Impulse demodulation to 100x shaft speed at the measurement point,and wide band acceleration 0-10,000 Hz.

You need to do the measurements more often than the time you think the bearing can go from good to bad condition.

Despite all this I have missed several failures, so don't feel to badly about it.

Cheers

John

hi
For low speed machines you have to take special precations like 1. low speed accelerometers senstivity 500Mv/g.
2. Shock pulse probe will also give good result.

Note: high frequency HFD detections will not give good results due to for low speed machines bearing defect frequency zone will not fall in high frequency zone.