On Monday 29 April 2013 20:12:27 Gregg Eshelman did opine: > --- On Mon, 4/29/13, andy pugh <bodge...@gmail.com> wrote: > > The Ward-Leonard arrangement is fairly elaborate in itself, > > but running it from a rotary phase converter is just excessive. > > I'd take off the vintage Rube Goldberg (or Heath Robinson for thos on > the other side of the globe) original setup and replace it with a > single phase PWM driver and DC motor. > > kbelectronics.net has some with basic controls, just an on/off switch > and a speed control knob with safety that requires the knob to be > turned to zero before it'll start the motor after power has been off. > An e-stop setup is up to the installer. > > The KBWT-26 list price is $168.00 (For 1HP motor) > The KBWT-210 list price is $228.00 (For 2HP motor) > > Those are bare units, enclosure is up to the installer. They do have > ones with enclosures and displays and more controls, also available in > rack mount - all extra frippery not needed on a lathe. > That is not a bad idea, but everyone is ignoring the 800lb gorilla, which is the cost of those larger PM field DC motors. The day of picking up a defunct treadmill, or a surplus motor from one, seem to now be in the distant past, with one that I saw on fleabay, clearly well abused, 6 months ago that still had 3 days to go and was above 200USD then. I'd love to do some sort of a bigger motor on my 7x12, but a 5 or 6 amp version of what I have now is north of $300, well north.
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) My web page: <http://coyoteden.dyndns-free.com:85/gene> is up! My views <http://www.armchairpatriot.com/What%20Has%20America%20Become.shtml> Coming together is a beginning; keeping together is progress; working together is success. A pen in the hand of this president is far more dangerous than 200 million guns in the hands of law-abiding citizens. ------------------------------------------------------------------------------ Try New Relic Now & We'll Send You this Cool Shirt New Relic is the only SaaS-based application performance monitoring service that delivers powerful full stack analytics. Optimize and monitor your browser, app, & servers with just a few lines of code. Try New Relic and get this awesome Nerd Life shirt! http://p.sf.net/sfu/newrelic_d2d_apr _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
