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 >
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