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
