Gene, Sorry, this message got sent in error. I was working on my wife’s iPad and some how a draft of an old message got sent rather than deleted.
Alan From: Gene Heskett <ghesk...@shentel.net> > To: emc-users@lists.sourceforge.net > Cc: > Bcc: > Date: Thu, 18 Nov 2021 18:40:59 -0500 > Subject: Re: [Emc-users] Spindle setup for 5i25/7i76 > On Thursday 18 November 2021 17:57:19 Alan Condit wrote: > > > I built a new controller for my 9x20 lathe using a 5i25/7i76 combo. I > > thought I had everything working but I still can’t get the spindle > > working correctly. I have a 1.5hp PMDC treadmill motor that I am > > controlling with a Cycletrol-150 DC controller. The am using the > > analog out from the 7i76 to replace the potentiometer to control the > > spindle speed. I have a 100 count encoder with index (homemade) on the > > spindle. The spindle starts under LCNC control but I am not getting an > > “at speed indication” at above 60rpm. > > > I might add that most of those treadmill controllers are far from linear > controllers even with a large buildout resistor between the 7i76 card > and their actual speed. The Pico Systems PWM-SERVO amp is the answer but > be sure and tell Jon your are running a spindle motor with it which is a > CCS load, it normally comes with an ICAS tuning for servo's which stop > when they get there, spindles don't. The Pico will need a suitable > analog DC power supply, whereas the Cycletrol probably runs from raw AC. > I have used the treadmill controllers, a couple times, but never got good > control so it was only till I built a better way. > > Now I use large amounts of P-Gain and the only indication of excess load > is when Jons driver throttles the motor at about 18 amps, making the > iron in the motor chirp quietly. Thats right close to 2 hp from a 1hp > rated motor but neither has even needed fresh brushes in years. > > > Sent from my iPad > > > > _______________________________________________ > > 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, 1940) > If we desire respect for the law, we must first make the law respectable. > - Louis D. Brandeis > Genes Web page <http://geneslinuxbox.net:6309/gene> > > > _______________________________________________ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users > _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
