Hello Viesturs, have a look at www.*harmonicdrive*.de/. They make gear boxes with a very high reduction rate in one stage, absolutely backlash free. The principle is the rotation of a so called flexible spline (having (n) teeth around its outside) which is steadily deformed by the rotating elliptical (really!) ball bearing inside. The spline, in turn, rotates engaged inside the gear box having (n+2) teeth inside. So, one rotation of the ellipse makes the spline wander by only 2 teeth giving a high reduction rate, typically 100:1. Those "gear" boxes are relatively small, too. There is no momentum on the driven axis, all force is exerted at the circumference causing high stiffness.
They are used for large telescopes, for instance, where these properties - together with a lot of torque - are essential. They have their price, though, I believe. By the way: I don't get paid by the company, just considered using those drives for my telescope mount some time ago. There is another (Bavarian!) company near us that was taken over by the Japanese recently. They use the cycloid principle for reduction, rather similar. Look at www.sumitomodriveeurope.com. Greetings and best wishes for the New Year from Peter Blodow Viesturs La-cis schrieb: > 2010/12/29 Bill Hribar <[email protected]>: > >> Hi All! >> >> Happy New Year! >> >> Anyway, dues anyone have a good source for synchronous belts and pulleys, >> with >> reasonable prices? >> >> > > Can anyone suggest a good source for worm-gearbox? Or whatever > reductors they use in robot arms - I have to build one. Thanks! > > Viesturs > > ------------------------------------------------------------------------------ > Learn how Oracle Real Application Clusters (RAC) One Node allows customers > to consolidate database storage, standardize their database environment, and, > should the need arise, upgrade to a full multi-node Oracle RAC database > without downtime or disruption > http://p.sf.net/sfu/oracle-sfdevnl > _______________________________________________ > Emc-users mailing list > [email protected] > https://lists.sourceforge.net/lists/listinfo/emc-users > > ------------------------------------------------------------------------------ Learn how Oracle Real Application Clusters (RAC) One Node allows customers to consolidate database storage, standardize their database environment, and, should the need arise, upgrade to a full multi-node Oracle RAC database without downtime or disruption http://p.sf.net/sfu/oracle-sfdevnl _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
