On Tuesday 17 December 2013 20:51:20 dave did opine: > On Tue, 2013-12-17 at 18:32 -0500, John Alexander Stewart wrote: > > Hello all; > > > > 2014 sees me finishing up my lathe conversion to CNC. (Emco > > Compact-8). > > > > I'm a bit "confused" about spindle sensors, and I do see a few > > different designs. > > > > Question - if you had to do it again, what would YOU do for a modern > > spindle encoder? > > > > (trying to learn from those who have gone before me, wish me luck!) > > > > PS - I'm tempted to just go for the CNC4PC Index Pulse Card, but maybe > > there are better alternatives out there. > > > > Thanks; > > John A. Stewart. > > Hi John, > Indeed I hope 2014 does see an operating cnc lathe in my shop. I ripped > out all the mechanical stuff and started on a cnc implementation of a > Jet 12 x 40. > For the spindle I did something dumb which I will need to fix. Used a > 360 cpr Koyo encoder but geared it (in a moment of dullness) 2:1 so > index pulses are not unique in angular index. Duh! I geared this with a > couple of timing pulley and a timing belt. I just need to make room for > 1:1 so I can use the index without hassle. Yes, I know I could divide by > 2 but the KISS principle is overpowering. > > If anyone has a really neat idea for getting the Z ballscrew aligned > with the Z axis I'm all ears.
I bolted up, loosely, the right end bearing, ran it up against the left bearing and adjusted the nut on the face of the carriage apron to hold the far end loosely in the correct position. Then ran the carriage to the right and tightened up the right end bearing where it fell. Then went back to the left, re-centered the nut in the apron, went back to the right and let that carrier move ever so slightly. My guess is that it is within a thou right now. No detectable bind. > I hope everyone has time with family over the holidays but also has time > to work on THEIR pet projects. Good Grief! Winter solstice is Sat. As > the frog said, "time fun when you are having flies." > > Dave > > > ---------------------------------------------------------------------- > > -------- 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 > > [email protected] > > https://lists.sourceforge.net/lists/listinfo/emc-users > > ------------------------------------------------------------------------ > ------ 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.cl > ktrk _______________________________________________ > Emc-users mailing list > [email protected] > https://lists.sourceforge.net/lists/listinfo/emc-users 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> "Every morning, I get up and look through the 'Forbes' list of the richest people in America. If I'm not there, I go to work" -- Robert Orben 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 [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
