On Sunday 05 May 2013 21:06:50 andy pugh did opine: > On 5 May 2013 02:25, Gene Heskett <[email protected]> wrote: > >> It seems to me that moving the brushes would be a better solution. > > > > I'll look again tomorrow, but first, it seems the brush holder should > > sit in the center of the pole pieces? > > For a completely reversible motor, yes. I think you probably want the > motor to run in the opposite direction, rather than reversibly. > > I can run my lathe in both directions, but I never have. I think the > chuck would unscrew if I tried.
I had a chance to play some more today as I pulled the OEM motor out to get a few measurements, I took a break, snapped the brush covers off and removed the end bell, finding that it was keyed into the stator, so I cut the key off so I could turn it at least until the through bolts were hitting the poles, put it back together with the bolts just loose enough I could take a hammer on a screwdriver and turn it about 2 degrees a tap. Putting a meter on the controller output, and with 3.000 volts out of the slider, I measured the voltage to make the motor turn at the rate it was, tapped it a few degrees & took another reading, but anything more than the width of the former key off, and the voltage went up, so I tapped it back and forth to find the minimum voltage and tightened the bolts. Maximum was around 8.31, minimum was around 8.21 and I could go both sides of the minimum. Nowhere near the size of difference I half expected. The only thing of note is that it seems to be about 10db quieter now, unless my ears got used to it. The most important thing I find in my measurements is that I will have to shorten the base and bring the bearing carrier risers up a little closer together than I'd like in order to have room on the right end (from the rear) for the OEM drive pulley. I have 6 & 7/8" for the length of the countershaft, which means the taperlock hub that holds the 3" 6 groove pulley will have its bolts on the inside face. I will, once I have a mockup made, have to pester somebody who knows how to calculate the length of the 6 groove belt I'll need. 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> Ad astra per aspera. [To the stars by aspiration.] A pen in the hand of this president is far more dangerous than 200 million guns in the hands of law-abiding citizens. ------------------------------------------------------------------------------ Introducing AppDynamics Lite, a free troubleshooting tool for Java/.NET Get 100% visibility into your production application - at no cost. Code-level diagnostics for performance bottlenecks with <2% overhead Download for free and get started troubleshooting in minutes. http://p.sf.net/sfu/appdyn_d2d_ap1 _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
