Don't servos need a lot of reduction to get the torque up? Gearboxes always bring backlash into the system. Low backlash boxes are lots of $$$.
Danny ---- dragon <[email protected]> wrote: > I hate to say it but I'm with Ed on this one. I just paid $32 each for > e661 servos WITH encoders to put on my 10x24 lathe and Jet 626 mill. > Grab a free thrown out PC and get rid of the noise problems from that > SPI bus on the rPi. Analog input drives can be had on ebay for $35, > especially if you run under 80vDC. With my 96v supply I hope to be up > around 150ipm. > > While 3 phase steppers are MUCH better than two phase for all of the > reasons that Danny listed, you can spend the same amount or less for a > servo setup if you don't mind some used components. > > After having worked with both, I knew that I wouldn't be happy with a > stepper system even for my little home machines. > > Just my opinion... > > On 01/24/2017 08:49 AM, Ed wrote: > > On 01/23/2017 11:45 PM, Gene Heskett wrote: > >> Greetings all; > >> > >> I see some "Nema 24" motors at quite reasonable prices showing up on > >> fleabay, > > > > SNIP > >> Now, I don't believe this is going to help with the resonance stalls I am > >> getting at about 30 ipm, so I'm thinking of building a viscous damper to > >> fit on the rear of this puppy. But unlike the ones on my hf micromill, > >> which are long steel spools carrying a 2+ inch stack of heavy fender > >> washers with elastomer sheets between the washers, which are true shock > >> absorbers as the resonance is killed by the frictional losses as the > >> washers walk on the talcum covered elastomer, but I don't have room for > >> a 2+" stack of fender washers in this spot. 5/8" axially at best. > > > > SNIP > >> Cheers, Gene Heskett > > > > > > RANT MODE ON > > > > Why in this day of cheap encoders, small ebay servo motors, and good > > inexpensive servo drives does any one even use stepper motors? > > > > Dampers, resonance issues, lost steps, stalls, only 30 IPM? Why? > > > > Gene, don't stay on the dark side! Go to servo's and don't look back, > > you will never regret it. > > > > RANT MODE OFF > > > > ----deflates----- > > > > Ed. > > > > > > ------------------------------------------------------------------------------ > > 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
