I am working on a Jet JTM-2 (Bridgeport clone from Taiwan). Re-fitted with a 3hp 3ph spindle motor, and axis kits for motorizing X, Y, & Z from Elrod Machine Works in Arizona. Originally was going to build them myself, but thought about the hours required, and felt the Elrod kits were well engineered, and worth the price!
I do have a few widgets in a pyvcp, but 2/3rds of the space is still open, so I would be interested in what you have done. Ray --J. Ray Mitchell Jr. [email protected] 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 9:52 AM, Gene Heskett <[email protected]> wrote: > On Tuesday 24 October 2017 10:23:13 Peter C. Wallace wrote: > > > On Tue, 24 Oct 2017, John Kasunich wrote: > > > Date: Tue, 24 Oct 2017 08:47:02 -0400 > > > From: John Kasunich <[email protected]> > > > Reply-To: "Enhanced Machine Controller (EMC)" > > > <[email protected]> > > > To: [email protected] > > > Subject: Re: [Emc-users] One final Q re using a dc spindle motor > > > > > > On Tue, Oct 24, 2017, at 08:14 AM, andy pugh wrote: > > >> On 24 October 2017 at 12:10, Gene Heskett <[email protected]> > 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 > > > [email protected] > > > > I have considered capturing a timestamp per quadrature state change (4 > > timestamp registers) then the drivers velocity estimation code could > > have the option of chosing time deltas from the same quadrature edge > > as the previous servo thread reading, but usually find I have other > > things to do... > > Chuckle, that old saw about the road to hell comes to mind, Peter. If > anything like me, you first have to find a round tuit, and I am still > looking for the artwork to do that which is not bound up an half a dozen > copyright claims. > > Thanks. When I get these blanket chests finished and stuffed in vehicles > going west, I'll get back to that project and make you one if I don't > miss roll call some morning first. > > 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 > [email protected] > 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 [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
