Depending on what ratio's you want, you could use 4 pulleys; on the motor, big and small, pulleys stacked on the spindle, small and big, pulleys stacked
Obviously these pairs will give you step up, step down, but you could use other pairs, maybe 1:1 and 1:3 for step down. Now you use two belts but both are loose. Two individual idlers will engage either pair. The Fadal uses this arrangement. I'm sure there are lots of pic of it. The belts should be contained such that when they are loose, they rest away from the pulleys. Roland On 26 May 2018 at 21:49, jeremy youngs <[email protected]> wrote: > On Sat, May 26, 2018, 13:32 andy pugh <[email protected]> wrote: > > > On 26 May 2018 at 19:20, Jon Elson <[email protected]> wrote: > > > > > I don't know what machine you have, but some machines have stock > retrofit > > > kits to replace the crummy Chinese drive scheme with something using > high > > > performance belts. > > > > It isn't too hard to imagine a system using two permanently-engaged > > different-ratio belt-drives and a couple of car air-conditioning > > clutches to choose between them. > > > > I want to use one clutch and two sprags for a compact envelope 😏😏 > > > > -- > > atp > > "A motorcycle is a bicycle with a pandemonium attachment and is > > designed for the especial use of mechanical geniuses, daredevils and > > lunatics." > > — George Fitch, Atlanta Constitution Newspaper, 1916 > > > > > > ------------------------------------------------------------ > ------------------ > > Check out the vibrant tech community on one of the world's most > > engaging tech sites, Slashdot.org! http://sdm.link/slashdot > > _______________________________________________ > > Emc-users mailing list > > [email protected] > > https://lists.sourceforge.net/lists/listinfo/emc-users > > > ------------------------------------------------------------ > ------------------ > Check out the vibrant tech community on one of the world's most > engaging tech sites, Slashdot.org! http://sdm.link/slashdot > _______________________________________________ > Emc-users mailing list > [email protected] > https://lists.sourceforge.net/lists/listinfo/emc-users > ------------------------------------------------------------------------------ Check out the vibrant tech community on one of the world's most engaging tech sites, Slashdot.org! http://sdm.link/slashdot _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
