On Tuesday 24 January 2017 19:07:27 Dave Cole wrote: > The other thing you get into with packaged drives like Omron, > Mitsubishi, Yaskawa, Teco, etc is that they are setup > to use their motors with their drives. You typically cannot mix > between brands. Don't bother calling them asking them how to > interface brand B motors with Brand A drives... they won't help you. > > Teco is very typical of low cost Asian packaged industrial drives. > Some of the Automation Direct cables interchange with these drives. > > http://machmotion.com/cnc-products/drives-motors.html?cat=62 > I've bought and recommended Teco packaged servos for several machines > and they have always worked out well. > > If you are willing to deal directly with dealers in China and Taiwan I > am sure you can better prices, but consider the costs of returns or > defective products... > > Some OEM machine makers buy Mitsubishi, Omron, Yaskawa, etc drives at > very low prices but unless you are buying $50K worth of drives per > year, you won't get the low prices. I'm working right now with an > OEM that buys Mitsubishi servo motors and drives by the pallet load. > > Regarding Nema 24 motors.. All of the ones on Ebay are direct from > China. So how does it work when you get a bad drive or motor or > one fails? If you need to call them, they are typically 12 hours > out of sync with Eastern Standard Time in the US. I think shipping > between China and the US is pretty much a one way ticket. It can > get here dirt cheap. Getting anything to China is expensive. > > For a 3 axis machine you are into $1000 for Nema 24 motors and drives > off Ebay. I certainly would not send $1000 to China for anything > unless I knew something about the manufacturer. Its not like you can > take them back to Walmart if they are junk. > > There is nothing wrong with Steppers. Just don't expect them to go > really fast and make any power at speed. I think the max power you > can get out of a stepper motor/drive is about 200 watts. > > Dave
Thanks Dave. But I got both of these from US based dealers. The nema 24 from a guy in FL, and the nearly 2x as heavy nema 23 from some guy in Joisey. And the FL motor got here in half the time the Joisey model did. It looks as if I won't get to play tonight, sometimes I have to go check the basement to see if the washing machine is still there. It was, darn it. Clean jeans and socks in almost vanishingly short supply, and I still have at least a full load of whites yet to do. > On 1/24/2017 2:43 PM, Mark Johnsen wrote: > > Actually, there are a lot of servo's like this (w/ step and > > direction). But, cost comparison is the issue. > > > > Omron and Panasonic servo's only accept step and direction (the ones > > I looked at) and you can probably get them off ebay for a decent > > price. I had once used Omron and was actually complaining they > > didn't have a +-10Vdc interface and only took step and direction. I > > think one reason is the Omron's are designed to be used w/ a step > > and direction output from their PLC's, that historically didn't do > > analog servo control, at least from the brick versions. I always > > wondered why they just didn't add the analog to the servo drive, but > > oh well. > > > > Also, here's a brand that BeachBumPete (from the IRC) used on his > > Cincinnati mill retro that accepts step and direction: > > http://www.dmm-tech.com/ > > > > I haven't used them, no affiliation w/ any of these, but the dmm > > guys also have a lower cost servo i just saw, DYN2 AC Servo Drive > > is step and direction and analog input... > > > > Chinese servo's from Alibaba or a place like salescnc.com have step > > and direction servos: > > http://salecnc.com/catalog/Delta-Taiwan-Servo-MotorDrive-Set-400W-30 > >00RPM?osCsid=du1blviq6dlbi02nscik0akre1 > > > > While that $350 price is high for a stepper solution, it's waaaayyy > > cheap for a servo drive and servo motor combo (with cables). For > > Kollmorgen servo's you're looking at a couple hundred bucks just for > > the cables!!! > > > > I think the bottom line is that the servo pricing hasn't come down > > like the bare-bones stepper motor and $50 stepper driver pricing. > > If you are cost conscious, steppers are the easier route. In Gene's > > case, to match the cost competitiveness, he would need to shop ebay > > for the 'right' deal and those don't come by everyday. > > > > Good Luck, > > Mark > > > > On Tue, Jan 24, 2017 at 11:17 AM, Andrew <pkm...@gmail.com> wrote: > >> 2017-01-24 19:37 GMT+02:00 sam sokolik <sa...@empirescreen.com>: > >>> PWM/dir though the bob. (these amc drives instead of +/-10v take > >> > >> pwm/dir) > >> Ah, so convenient. We could save a lot on 7i77's if all servo > >> drives were like this ) > >> > >> Andrew > >> ------------------------------------------------------------ > >> ------------------ > >> 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 > > > > -------------------------------------------------------------------- > >---------- 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 > > ---------------------------------------------------------------------- >-------- 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 Cheers, Gene Heskett -- "There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order." -Ed Howdershelt (Author) Genes Web page <http://geneslinuxbox.net:6309/gene> ------------------------------------------------------------------------------ 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
