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Old 11-25-2019   #27
grahambehan
 
Join Date: Feb 2013
Location: New Concord Kentucky
Posts: 186
Default Re: Low whining sound from undercarriage

The change made to helix angle as mentioned by Hib was a significant change to radiated gear mesh frequency because it increased contact ratio, ie the number of teeth in mesh. There are detail changes to tooth profile and flexibility that affect the load progression across the teeth and thereby reduce the noise generated as the gears mesh also.

Graham
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