On Friday 19 November 2021 09:33:20 Alan Condit wrote: > 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 NP Alan, but did you get it fixed?
> 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 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
