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
