On Tuesday 24 October 2017 09:54:23 jrmitchellj . wrote: > I would thin a 1HP drive should be able to plow through and thread a > 3.8" hole without much grief, especially in low gear. > I have the servo amp current limit set at around 15 amps, and I can hear it squeaking as it regulates under a heavy load, and a 3/8"x18 tap is that, set for 1/2 turn per peck, it bogs down and the squeak is quite audible. The problem is the backgear ratio, its only 2/1. For tapping it really ought to be 10/1 if its being asked to turn a 3/8 or a 10mm tap.
> I have not set up my system for low range yet. Allot to think about > on that. Still working on the basic system & bugs. I just use enough Pgain so it turns the motor up and makes about 90% of the requested speed when its in backgear. That also means the near for at-speed has a wide window. Probably too wide but its working. :) What mill are you working on?, this is a grizzly g0704. Dirt cheap, basically a 400 lb table topper on a stand. I needed something to carve green and green style box joints in a full 12" (11.4 actually) mahogany board for a furniture project x 3 more as I'm making one for each of my 4 boys. For that it worked very well, but the mahogany I bought was kiln fried, poorly stickered and warped so bad it was impossible to use it for the boxes lids. I took a lid back and let it rock on the counter where I bought it, and they took about a year to locate some that wasn't warped in the kiln. Once heated, the lignite is set forever so its not possible to unwarp it. A nominally 2' x 4' lid rocked about 4" on diagonal corners. Obviously at the price of mahogany, I was not a happy camper. Just that lid was around $90 worth of wood at nearly 8 sq ft. > I was just thrilled to get the speed indicator and "at speed" signals > working correctly! Yes, that does widen the grin. :-) > Ray I have some other stuff in an xml file for the right hand window, stuff like a soft start tally for the spindle motor psu, otherwise it clears a 20 amp breaker at power up, two more for spindle direction, and a bunch of stuff to run an endoscope camera mounted on the spindle lock ring. I'm finding I have to rewrite most of those commands, and I was working on that when a short to the data cable blew my 5i25's. So there is work yet to be done. The xml for that gui is pretty much done, and I can send it along if it would give you some ideas. Just ask. > --J. Ray Mitchell Jr. > jrmitche...@gmail.com > (818)324-7573 > > > The dogmas of the quiet past, are inadequate to the stormy present. > The occasion is piled high with difficulty, and we must rise with the > occasion. As our case is new, so we must think anew and act anew. We > must disenthrall ourselves, and then we shall save our > country.*Abraham Lincoln > <http://www.quotationspage.com/quotes/Abraham_Lincoln/>*, *Annual > message to Congress, December 1, 1862* > *16th president of US (1809 - 1865)* > > On Tue, Oct 24, 2017 at 5:47 AM, John Kasunich > <jmkasun...@fastmail.fm> > > wrote: > > On Tue, Oct 24, 2017, at 08:14 AM, andy pugh wrote: > > > On 24 October 2017 at 12:10, Gene Heskett <ghesk...@shentel.net> wrote: > > > > Correct, except encoder.nn.velocity is fed thru a last 4 edges > > > > averager to remove some of the noise in the encoders output. > > > > That unforch also affects the spindle to Z phaseing in the G33.1 > > > > backout. > > > > > > You might want to filter the velociity, but I see no point in > > > filtering the position, which is what G33.1 uses > > > > > > You could also try using the DPLL timer to take jitter out of your > > > encoder sampling. That's a pretty simple setting with the right > > > firmware (one that ends in "D" for DPLL) > > > > I'm pretty sure Gene's "4 edge average" is dealing with mechanical > > errors in his homebrew spindle encoder rather then sampling jitter. > > The 4 edges mean that it averages over a full quadrature cycle and > > thus deviations from proper 90 degree quadrature phasing are > > masked. > > > > John Kasunich > > jmkasun...@fastmail.fm > > > > ------------------------------------------------------------ > > ------------------ > > Check out the vibrant tech community on one of the world's most > > engaging tech sites, Slashdot.org! http://sdm.link/slashdot > > _______________________________________________ > > Emc-users mailing list > > Emc-users@lists.sourceforge.net > > https://lists.sourceforge.net/lists/listinfo/emc-users > > ---------------------------------------------------------------------- >-------- Check out the vibrant tech community on one of the world's > most engaging tech sites, Slashdot.org! http://sdm.link/slashdot > _______________________________________________ > 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) Genes Web page <http://geneslinuxbox.net:6309/gene> ------------------------------------------------------------------------------ Check out the vibrant tech community on one of the world's most engaging tech sites, Slashdot.org! http://sdm.link/slashdot _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
