On Thursday 03 March 2016 10:29:22 Dave Cole wrote: > On 3/2/2016 11:39 PM, Chris Albertson wrote: > > On Wed, Mar 2, 2016 at 12:28 PM, Dave Cole <linuxcncro...@gmail.com> wrote: > >> Spur gear transmissions are inherently noisy. I think that is why > >> helical gears exist. However they typically have higher load > >> capacity for the same width of gear (as I recall). > > > > It is because the teeth are wider because they are at an angle. > > But you can't swap in a helix gear without dealing with the end > > thrust. You'd need to have a bearing that can handle the axial load. > > A timing belt would be even more quiet. > > As I recall from my education years ago the reason why helicals are > quieter is that more than one tooth is engaged at a time. So there is > not an abrupt end to one tooth engagement and then the engagement of > the next. That's why you almost never see straight cut gears in > automotive transmissions. > > The General Motors 4 speed Muncie "Rock Crusher" manual transmission > used low angle helical gears which made it almost a spur gear > transmission. It was popular for drag cars since it could stand up to > high torque shock loads. But the transmission made a lot of noise > due to the low gear angle. > > Bewarned: Car Porn at the link below! > https://www.youtube.com/watch?v=3_053IZjH7c
Yep, heard that for 100k+ miles all those years ago. I kept waiting for the tach to be exercised though :) > > Dave > > > ---------------------------------------------------------------------- >-------- Site24x7 APM Insight: Get Deep Visibility into Application > Performance APM + Mobile APM + RUM: Monitor 3 App instances at just > $35/Month Monitor end-to-end web transactions and take corrective > actions now Troubleshoot faster and improve end-user experience. > Signup Now! > http://pubads.g.doubleclick.net/gampad/clk?id=272487151&iu=/4140 > _______________________________________________ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users Cheers, Gene Heskett -- "There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order." -Ed Howdershelt (Author) Genes Web page <http://geneslinuxbox.net:6309/gene> ------------------------------------------------------------------------------ Site24x7 APM Insight: Get Deep Visibility into Application Performance APM + Mobile APM + RUM: Monitor 3 App instances at just $35/Month Monitor end-to-end web transactions and take corrective actions now Troubleshoot faster and improve end-user experience. Signup Now! http://pubads.g.doubleclick.net/gampad/clk?id=272487151&iu=/4140 _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
