On Saturday 16 May 2020 17:13:23 Chris Albertson wrote: > On Sat, May 16, 2020 at 12:24 PM Gene Heskett <ghesk...@shentel.net> wrote: > > Which then brings up the need for some math. So how would one go > > about getting from a 3 phase stepper motors holding power, say 3 NM > > to lbs/ft at the output of a 12/1 cycloidal gear? > > > > Assuming zero losses in the bearings, which I'd guess at 5% if > > decent bearings. > > > > Could that 3NM motor hold it, or even move it under cutting loads? > > Torque multiplies by the gear ratio. So if the motor holds 3.0 Nm and > there is a 10X r > eduction then the part can be held to 30 Nm. If you need the result > in foot-pounds it is an easy conversion. > > But many times they use two reduers in series to get an effective 100x > reduction then you have 300 Nm. What is needed? You need to know > the force from your cutter and the distance from the cutter to the > axis. You can always adjust the cutter force by taking smaller cuts. > Several of those on ebay for solid gold prices have far less outer pins than teeth on the moving wheels, looks like at least 100/1 can be obtained from a single stage that way but the tooth shapes seem like they are not exactly fixed arcs but just fractions of full arcs. That would be more complex to make, but probably still quicker than 2 stages with full arcs as the wiki page shows.
> > 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 > > Emc-users@lists.sourceforge.net > > https://lists.sourceforge.net/lists/listinfo/emc-users > > -- > > Chris Albertson > Redondo Beach, California > > > _______________________________________________ > 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) 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 Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
