Thanks for the info!
The ~3700Hz frequency corresponds to our calcs for fundamental frequency on this pinion (24tooth,9000rpm). We also have multiple needle roller bearings in the system, but their fundamental frequencies dont appear to correspond to this noise frequency occuring and thus we've...
We have a 20deg pressure angle helical gear-pinion set (17deg helix angle), AGMA 12 quality, with pinion rotating at 9000rpm, causing an annoying noise frequency ~3700Hz.
Any pointers on noise reduction? Our housing is aluminum. We've been told that perhaps 14.5deg pressure angles would reduce...
