> -----Original Message----- > From: Gene Heskett [mailto:ghesk...@shentel.net] > Sent: Saturday, May 16, 2020 4:32 PM > To: emc-users@lists.sourceforge.net > Subject: Re: [Emc-users] Cheaper than normal FHA-25B > > On Saturday 16 May 2020 16:01:08 Ken Strauss wrote: > > > 3 Nm is about 2.21 ft-lb so at 12:1 reduction I think it would provide > > about 26.5 ft-lb. For comparison, the Tormach microArc4 (harmonic > > drive with NEMA 34 stepper) claims to provide a maximum holding torque > > of 28 ft-lbs but they suggest using only half of that to avoid > > excessive wear. I don't know the reduction ratio for their unit. > > See https://tormach.com/microarc-4-4th-axis-38412.html > > > I don't know as I ever seen a nema 34 that short, and neither of those > lb/ft rating are very impressive. I'd be a heck of a lot more > comfortable with 100 lb/ft. With the BS-1 being a 40/1 worm, I'd expect > well north of that when stationary. Asking the worm to move it at 50lbs > might tax things though. I wonder if the cycloidal drive could be > shrunk to serve as the worm drive on a BS-1? Say 3" OD?
I haven't been closely following this discussion so I apologize if my questions have already been answered. How much does a decent sized harmonic reducer cost new (non-eBay)? Who makes a good unit? _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
