On Tuesday 17 December 2013 21:22:48 dave did opine: > On Tue, 2013-12-17 at 20:59 -0500, Gene Heskett wrote: > > 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 > > That makes sense, I've just been mentally fighting it. Tnx. > > Dave > As an ex bro-in-law once remarked: Its good enough for the girls I go with. He had a rather dry sense of humor about injustices though. He enlisted back in the day, finished growing up into a 225 lb 6'3" man but was given a medical when they found he had chorea. Can home, bought an old neighborhood bar, and had been running it quietly for about 18 months when the city building inspector came in one night and said he was out of code, no back fire exit & he was going to padlock the place. Roger protested that the bar had been there, getting along with its neighbors for something like 30 years, why the sudden, and unannounced enforcement activity the guy couldn't even produce the city code that defined it. Roger by then knew the layout in the alley back of the building and suggested, pointing at a fairly clear spot on the back wall, saying "there" might be a good place for a new door.
The guy agreed, so Roger picked him up and used him to make a new doorway in that 40 yo brick wall. Then he called the cops, whom he was on good terms with, told them to come and take out the "trash". They did, charges were never filed. Roger framed in the hole and hung a cheap steel door in it the next day so he was legal again. He was funny about abused kids, married the first 2 times just to file and take the child away from an unfit mother in the divorce a few months later. Got married to an RN then, who was supplying the money to build them a house for all 3 kids, cash & carry. Rogers sweat equity. Most bar owners have to make an "attitude adjustment" occasionally, but Roger said 4 or 5 years later after he had sold it, making a good profit, that after that, he never had to do it again, just a look under a raised eyebrow was all it took. But chorea and scoliosis was taking him down fast, by then I was 1" taller than he was. I have no idea if he still survives, would be about 63 now. I haven't checked since his older sis, my ex bitch, left in late '85. Cheaper that way. 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> Make it right before you make it faster. 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 Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
