For what you are doing, that looks really good! Nice work!
What resolution encoder do you have on the motor? Dave On 3/24/2014 7:51 PM, Leonardo Marsaglia wrote: > Taking back to life this topic. > > I just uploaded a crappy video (sorry for the quality it was filmed with a > cheap phone) that shows how the positioning system is working. > > Here's the link: https://www.youtube.com/watch?v=Rv2Y9xEkwpI > > I think in the not so far future I'm going to replace the 2:1 spurs that > drive the screw with a heavy timing pulley to reduce the torque ripple > during the acceleration. I also thought about upgrade to a permanent magnet > AC motor but for now I'm satisfied. > > It's important to say that the chariot weights more than 60 kg and it's > working vertically so the results are great. The following error here was > set high but as you this is for induction heating so there's no need of > high accuracy. > > Hope you enjoy it, I'm going to upload a better quality video soon with > more detail about the motor and the machine! > > > Thanks as always! > > Leonardo. > > > > 2013-12-13 11:32 GMT-03:00 Gene Heskett <ghesk...@wdtv.com>: > >> On Friday 13 December 2013 09:07:06 Gregg Eshelman did opine: >> >>> On 12/12/2013 3:26 PM, Leonardo Marsaglia wrote: >>>> 2013/12/11 Dave Cole <linuxcncro...@gmail.com> >>>> >>>>> It sounds like you are greatly simplifying the machine. An MG set >>>>> (motor generator set) is a very old technology to create DC power. >>>>> That was probably obsolete when it was installed. >>>>> >>>>> Yes indeed, I really don't understand why a 70's machine would use an >>>> motor generator to feed a DC motor. >>> For the early variable speed DC motor drives, Monarch and some other >>> lathe manufacturers used a 3 phase AC motor driving a DC generator to >>> power the DC motor. >>> >>> There have been more than a few people hook those up to rotary phase >>> converters. >>> >>> Single phase AC motor driving a three phase AC generator, powering the >>> three phase AC motor, driving a DC generator, powering the DC motor. >> Such complexity in big iron is crazy, and crazy expensive too, if your hp >> requirements are reasonable. Empire electric, someplace in WI, can sell >> you a 0-10 volt analog input control for a dc motor, runs on the 127 volt >> powerline, and can deliver 25 amps if your circuit breakers can, all for >> about $150. Needs about 2.5" of height above a nominally 6x6" open frame >> plate, which is grounded. Hide it anyplace handy. >> >> That will power a honking big 4 or 5 hp treadmill motor (see ebay) cleanly, >> cool & absolutely silently. All in ultrsonically switched hexfets, so >> essentially zero heat. These motors aren't "dressed for the party" but >> appear to have only one failure mechanism, worn out brushes. They are >> quite good sized, so that will take quite a while. >> >> Laying on the table turning 10k or more revs, you can't hear anything but >> the fan pulling cooling air. >> >> I have one running a 1.5hp treadmill motor with a 9 amp circuit breaker >> that has only been tripped a couple times, I had miss wired one of my ice >> cube relays. >> >> Cheers, Gene >> -- >> "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> >> >> Help! I'm trapped in a Chinese computer factory! >> A pen in the hand of this president is far more >> dangerous than 200 million guns in the hands of >> law-abiding citizens. >> >> >> ------------------------------------------------------------------------------ >> Rapidly troubleshoot problems before they affect your business. Most IT >> organizations don't have a clear picture of how application performance >> affects their revenue. With AppDynamics, you get 100% visibility into your >> Java,.NET, & PHP application. Start your 15-day FREE TRIAL of AppDynamics >> Pro! >> http://pubads.g.doubleclick.net/gampad/clk?id=84349831&iu=/4140/ostg.clktrk >> _______________________________________________ >> Emc-users mailing list >> Emc-users@lists.sourceforge.net >> https://lists.sourceforge.net/lists/listinfo/emc-users >> > > ------------------------------------------------------------------------------ Learn Graph Databases - Download FREE O'Reilly Book "Graph Databases" is the definitive new guide to graph databases and their applications. Written by three acclaimed leaders in the field, this first edition is now available. Download your free book today! http://p.sf.net/sfu/13534_NeoTech _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
