Wish I'd have known about those 5 years ago, likely would have worked better than the motors I did settle on.
----- Original Message ----- From: "dragon" <tfishw...@gmail.com> To: "Enhanced Machine Controller (EMC)" <emc-users@lists.sourceforge.net> Sent: Monday, February 6, 2017 11:57:39 AM Subject: Re: [Emc-users] need a tutorial on 3 phase, 1.2 degree a step, motors Very true Todd. I relied on advice from others who have been there, done that. I also worked with a CHNC that had some E661 servos so knew about what their capabilities were. But google helps a bunch too in this particular case... Reliance Electric E661 (661-028-0156) Spec's: Peak Torque : 450 oz-in Continuous Torque : 105 oz-in Max Terminal Voltage : 90v Continuous Current : 4.4 amp Peak Current : 18.7 amp Inductance : 6.6 mH Motor Kt : 26.71 oz-in / Amp Motor Ke : 21 Volts/Krpm Continuous Speed : 4,500 rpm (No Load) Hardinge used these servos on the CHNC and they are plenty adequate for both my 6x26 mill and 10x24 lathe as well as Gene's Sheldon. I'm just trying to say that there are possibilities for using servos in a situation like mine or Gene's that won't break the bank. This is not necessarily a solution for everyone. If it was a production machine, I would use new parts and have a high expectation of their performance and life span. This is a home/hobby machine and I will likely never put the hours on it to wear out the used parts. Buying from ebay is a bit of a gamble, but that is where Gene was talking about getting things from anyway. That is also why I only ordered a couple at first to see if they were in usable condition and then went back to the same outfit to get more. On 02/06/2017 10:38 AM, Todd Zuercher wrote: > The problem with trying to buy used motor like that is how do you know what > the motor specs are. There is nothing posted on the add, the Electrocraft > part numbers are old and obsolete, or are a custom part number so you can't > just look them up (at least not easily). What are the motor dimensions, > V/rpm constant, max amps, encoder counts... all the important stuff you need > to know about a servo before you buy it? > > ----- Original Message ----- > From: "dragon" <tfishw...@gmail.com> > To: "Enhanced Machine Controller (EMC)" <emc-users@lists.sourceforge.net> > Sent: Monday, February 6, 2017 10:15:36 AM > Subject: Re: [Emc-users] need a tutorial on 3 phase, 1.2 degree a step, > motors > > There are several 'sellers' from NES Sales in New York state. I bought a > total of 6 from two of them doing a make an offer and they both accepted > my offers which ended up at just under $40 each by the time I added > shipping. All 6 appear to be in working order, the brushes have little > wear, and all of the encoders work, but one is missing the encoder > cover. Here is the listing I last purchased from... > > http://www.ebay.com/itm/122072353227?_trksid=p2057872.m2749.l2649&ssPageName=STRK%3AMEBIDX%3AIT > > As for drives, it just depends on what you need for current and voltage > requirements. If you are running under 80v DC then the AMC B25A8 or > B30A8 can be found for as low as $35 + shipping on ebay. There are > Copley equivalents as well. I plan to run my DC supply at around 93v > after rectification so I will end up spending a bit more as I will need > higher voltage amplifiers. I don't mind the extra cost for the increased > performance. > > > > > On 02/06/2017 08:48 AM, John Thornton wrote: >> Do you have a link to the $40 servo and $50 drive? All I can find on >> fleabay is $52 and up for the servo + $26 to $32 for shipping. >> >> JT >> >> >> On 2/6/2017 7:27 AM, dragon wrote: >>> On another note... you can get E661 servos with encoders off of ebay for >>> $40 to your door and they are a great match for your Sheldon. Grab some >>> used servo drives for about $50 each depending on your power supply >>> situation. >> >> >> ------------------------------------------------------------------------------ >> 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 > ------------------------------------------------------------------------------ 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
