On Friday 12 December 2014 14:42:26 skullwo...@yahoo.com did opine And Gene did reply: > Gene; > > Have you tried the motor without the damper?
Not since putting a D525MW based machine in that position. This setup is still a software driven pulser. > Seems the whole damper kludge was to make up for primitive half & full > step drives being fed a pulse stream of questionable consistency. I expect there is that too. I am running 2M542's for drivers, set at x8 stepper divisors. And I do expect to get another 5i25 & put it in that machine as I am very impressed with how it works on the lathe. Between that, and I just rx'd a stack of 48 volt, 3,3 amp supplies that I'll turn down to 45 volts if they'll go that low. Whatever all 5 of them will turn down to, parallel them with .5 ohm isolation R's, into a big Sangamo cap, and run all motors from the capacitor. That should give the 2M542's a place to throw the switching current back flows without causing the supplies to trip off, a major problem in an older setup I had lashed together at one time about a decade back. I've no idea what sort of shutdown or over current fold back these units might do, so it remains TBD as to whether or not they can start and charge a 73,000 uf cap. OTOH, I also have some 6300 uf'ers at 35 volts, 2 of those in series with resistive voltage balancing would be a lot less inrush at power up, and still ought to gobble up whatever the dancing motors can throw at them. > On the flip side - the rattle dampers using cylinder shaped weights > needs to be loose and dry to work. Tests done with oil added proved > this causing the damper to become effectively a fly wheel and making > performance even worse then running nothing on the motor rear shaft. I'd assume you mean by the attainable accels? Or by the attainable speeds before stalls? However, progress on this will be slow till warmer weather comes round again. I need to round up the 5i25, and another motor as I caught the power cable for the Y over the end of a board last week and ripped the wires out of the 225oz nema 23 on it, and had to put my last & only spare 425 on it. My back after this past weekend is giving me hell & I need to arrange for some more cortisone shots before I can do a hell of a lot more. This past weekend was a bit of a whirlwind. My oldest son took a bottle and a kia and killed himself last Thursday, so I was up at 3:30ish Friday morning to catch a plane to Omaha putting me in driving range of the weekends events, so I was in Yates Center KS Saturday & saw another son get married, to a girl he brought with him to visit last fall, and I told him then she was a keeper. So they did it on a date that will never come around again for 1k years, 12/13/14. Then a motel for the night, getting up the next morning & heading for Central City NE, & arriving after visitation got started, no casket because he was cremated, saw that thru and had a couple meetings with his widow Lesa, and since all the rest of my boys (now 4) were there, we had a meeting and I came away with a partial list of who gets what when my time is up. But then the conversation got side tracked and we now have tentative plans to go on a Texas pig hunt sometime next fall. Apparently as guest of the boys. Thats the plan anyway. ;-) Then back to my youngun's place in Nebraska City & let my back rest Monday morning, went to work with him in the afternoon, he works at a service facility that specializes in repair and re-certification of stuff used in the Nuclear industry, and wound up actually doing some work, teaching school as it were. Patrick intro'd me around to the rest of the crew as hands down the smartest person in the building. I may have been, but IMO that also tends to make the rest of the frogs a bit wary. But I am also pleased as punch that he thinks so. :) FWIW, there are people on this list that fit in that category too, and you know who you are. And, because you do know who you are, you know why I write the above. Patrick is learning a lot working there, and for a boy who got a bit of a slow start as he was born deaf, and lived on a pre-digested formula for the first 2 years, but his ears at about 5 yo started to work and now in his mid 30's, hears at least as well as I do at 80. I have a study course on passing the C.E.T. exam that I will pack up and send him as it may help advance his knowledge. A refresher course for ancient C.E.T.'s like me since my certificate dates from 1972. Retracing my steps to fall out of a Saab 340B in Bridgeport just minutes shy of midnight last night, its been a very busy weekend with a few tears thrown in that I'll remember for a while. As the old saw goes, a man is not supposed to outlive his git, but I have now outlived the mother of those 3 children and all 3 of them. That was the last of the children Annie gave me back in the late 50's & early 60's. And that is truly sad. I saw this coming I must admit, you can't help it from observing alcoholics for the last 80 years, but its still hard to swallow without tearing up when its your own child. And thats the news from the WV version of Lake Woebegon. Back to you regularly scheduled programming now. Whoever skullworks is, thanks for the observation, it will be a valid concern to be tested when I get a 5i25 doing the driving. 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) Genes Web page <http://geneslinuxbox.net:6309/gene> US V Castleman, SCOTUS, Mar 2014 is grounds for Impeaching SCOTUS ------------------------------------------------------------------------------ Download BIRT iHub F-Type - The Free Enterprise-Grade BIRT Server from Actuate! Instantly Supercharge Your Business Reports and Dashboards with Interactivity, Sharing, Native Excel Exports, App Integration & more Get technology previously reserved for billion-dollar corporations, FREE http://pubads.g.doubleclick.net/gampad/clk?id=164703151&iu=/4140/ostg.clktrk _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
