I assume that you are thinking of https://hackaday.io/project/19405-strain-wave-gear-with-timing-belts Thanks for the interesting idea!
> -----Original Message----- > From: Chris Albertson [mailto:albertson.ch...@gmail.com] > Sent: Saturday, May 16, 2020 6:21 PM > To: Enhanced Machine Controller (EMC) > Subject: Re: [Emc-users] Cheaper than normal FHA-25B > > THere are two different kinds of drives. The "harmonic" and > "cycloidal". THey both use an eccentric center gear but the teeth > have different shape. The cyclodal type use arcs and have fewer > teeth. This is why I said they could be made using average equipment > -- just an end-mill. > > You can get 100:1 with a 10 tooth cyclodal by stacking. THere are > some smart designs where a stack of two is less then 2x tall. > > One more thing: Some smart person figured out how to make a 100: > harmonic system with no need to make an internal ring gear. Internal > 101 tooth gears are hard to make. So it used a timing belt press fit > into a hollow cylinder. THen you can use a timming pulley as the > eccentric. > > > 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. > > > -- > > Chris Albertson > Redondo Beach, California > > > _______________________________________________ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
