The theory with printed gears is that with helical gears there is more material in contact so the stress on the teeth is reduced and that for plastic we need this extra strength. But what I found is that teeth never fail. The hubs fail first.
The better reason for helical gears is that they are quieter. But if they move slow, all gears are quiet. Try breaking stuff, it's fun. especially if the material cost only 2 cents per gram. If you have parts that did not come out as you like. Try crushing them in a vice, whacking with a hammer or screw it to a shaft and see what it takes to break the set screw. On Wed, Jun 17, 2020 at 9:03 PM Gene Heskett <[email protected]> wrote: > On Wednesday 17 June 2020 22:28:22 andy pugh wrote: > > > On Thu, 18 Jun 2020 at 03:04, Gene Heskett <[email protected]> > wrote: > > > > Note, these are a daft idea. But I have actually seen a 9 foot > > > > diameter triple helical in my dad's old workplace. He did need to > > > > explain to me why it was silly, and why they refused to replace it > > > > and specced a double instead. > > > > > > That's easy, the teeth in the middle were carrying twice the thrust > > > load. > > > > It isn't that it is that it is kinematically redundant, one of the > > sets of teeth will see no load at all. > > Or, given manufacturing tolerances it could even dance from one set of > teeth to the other. I was assuming a perfect make, where the outside > rows of teeth would be carrying half the thrust load per side that the > middle row was carrying by itself. But it never got a chance to wear in > and achieve even that. > > > (Though possibly, over time, they might wear to share equally) > > > 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) > If we desire respect for the law, we must first make the law respectable. > - Louis D. Brandeis > Genes Web page <http://geneslinuxbox.net:6309/gene> > > > _______________________________________________ > Emc-users mailing list > [email protected] > https://lists.sourceforge.net/lists/listinfo/emc-users > -- Chris Albertson Redondo Beach, California _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
