On Friday 28 August 2020 06:18:32 Thomas J Powderly wrote: > Gene an old client called about using a Newbould indexer on his > machine. > > I remember it was a hirth 'gear' or coupler > > Very accurate stacking 'gears' , a way to set a part at precise angles > > I thought... "Hey Gene could _print_ one" > > as if you dont have enough to do :-) > > just FYI > > TomP > > https://en.wikipedia.org/wiki/Hirth_joint > > https://www.youtube.com/watch?v=3EGGuR5YziE > The odd tooth version could probably be done in sub-degree jumps but not with a 3d printers tolerances.
I'm learning how to make flexgears for a harmonic drive out of TPU. PLA hasn't enough flex and breaks in less than 5 minutes running time. And I've two that have now run at an output speed of about 1 rev in 4 seconds for over 24 hours. Unlike the really preciely made metal one's, it has to have a touch of backlash, but with a decent driver, and none of the TB series fit that description, because they don't auto-throttle the currants, it looks like I'll have enough torque from a nema 17 motor to drive the worm of a clone BS-1, under cutting load no less. TPU can be a cast iron bitch, its 100x more finicky about temps and speeds than PLA. Currently seems to be working, but at a nozzle temp 15C above whats noted on the no-name box I bought 2 of for a $70 bill. Virtually zero extruder drive grip allowed in a Micro-Swiss hot end that moves the extruder motor to the X carriage. Thanks TomP, stay safe and well, both of you. 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
