On Sat, May 26, 2018 at 11:31 AM, andy pugh <bodge...@gmail.com> wrote: > On 26 May 2018 at 19:20, Jon Elson <el...@pico-systems.com> 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.
Better maybe... The Toyota Prius-C uses a 10 HP electric DC motor and an electrically controlled step-less continuously variable transmission. Some day these parts will be common in junk yards The way they do "steepless" uses two motors, one for speed control and one for torque control and they are combined in gearbox that resembles an automotive differential No clutch is needed and both motors run at the same time. So if you are willing to use multiple motors to can combine then so you don't need a clutch and get double the power (by using both motors) at higher speeds On the other hand if you are willing to install a clutch you can have two speeds with one motor, the clutch is used to select in or out the reduction counter shaft If you are a true "gear head" Toyota's gearbox is a masterpiece as it combines the power from one gas engine and two electric motors and lets the car drive at any speed and any gear ratio with no belts or cones and a very minimal parts count. But the complexity is just "over the top" for use on a milling machine. -- Chris Albertson Redondo Beach, California ------------------------------------------------------------------------------ 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 Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
