On Wednesday 02 September 2020 10:37:14 Sam Sokolik wrote: > yah.. It has a lot of possibilities.. (on the mill) I was using it > to find a rough center of a hole by turning the spindle and letting > the the tool tip describe a circle. Also - inside turning operations > on a mill... (slow of course..) > Just for S&G, I ordered 2 of those 2NM 3 phase stepper-servo's yesterday. That should get my lathes X above 100 ipm nicely.
Now, as I see it, the next hurdle is a MOD function that can follow the spindle encoder, its 240 edges per rev. At a 1khz servo loop rate, that would be practically limited to about 30 rpm, given a good quadrature ratio, or 1/2 rps. Doable. 10 rpm would be relatively possible. But from the new manual, it appears there's only 1 sentence in 900 pages on the MOD function. Its not stated if int or fp but from the wording, I'd guess its fp. Is there any other doc that goes into more detail? It would be nice to do on my mill, but its spindle scale is either about 7xxx.xxx in high gear, or 14xxx.xxx in low, its a 1000 ppr on the back of the motor so changes with the gear shift knobs tally switches. Hal changes so the tach is still accurate in spindle rpms. There I go, thinking out loud again. ;-) > On Tue, Sep 1, 2020 at 4:36 PM Gene Heskett <ghesk...@shentel.net> wrote: > > On Tuesday 01 September 2020 11:37:47 Ralph Stirling wrote: > > > I've been quite mesmerized by Sam Sokolik's videos > > > of his synchronized spindle/X axis lathe work. It just > > > occurred to me that this might be handy for doing > > > four-jaw turning. You could just stick your work in the > > > chuck approximately centered, touch off two 90 degree > > > offset points, and have the "virtual" centerline offset > > > appropriately from the actual center of rotation. > > > > > > That would eliminate the tedious task of centering > > > the stock in the four-jaw chuck. Some more hal > > > coding or trajectory calculation required, of course. > > > > > > -- Ralph > > > > Luv the idea Ralph, but that would really warm up my vfd, running > > that slow. I have it set to shut down at about 9.5HZ but even then > > 30 minutes doesn't overheat the motor because I also have a current > > limit programmed to match the nameplate FLA. And I think that would > > prompt me to replace the nema 24 motor on my x with one of the 3 > > phase step driven nema 23 servo's of 2NM. I have a 3NM one of those > > replacing the 1600oz/in that was on the z, and its moving 2x faster > > now. But the 3NM is about 10mm too long to fit in the x location and > > the encoder would not fit on the back of the motor without plowing a > > huge groove in the Sheldons bed. Not gonna happen. > > > > Thanks Raplh. > > > > > ________________________________________ > > > From: Sam Sokolik [samco...@gmail.com] > > > Sent: Monday, August 31, 2020 11:07 AM > > > To: Enhanced Machine Controller (EMC) > > > Subject: Re: [Emc-users] Because the hardware store was 4 miles > > > away... > > > > > > CAUTION: This email originated from outside the Walla Walla > > > University email system. > > > > > > > > > I am adding poor man's trajectory planning.. (not really planning) > > > > > > adding the ability to add a tangent-tangent radius to the > > > polygon.. This is so there isn't an abrupt change in direction. > > > > > > The one pic shows a 0 radius vs .020 radius... The over shoot for > > > the given spindle rpm is all but zero. > > > > > > On Thu, Jul 16, 2020 at 11:22 PM Sam Sokolik <samco...@gmail.com> > > > > wrote: > > > > some close up-ish with slow mo... > > > > > > > > https://nam05.safelinks.protection.outlook.com/?url=https%3A%2F% > > > >2Fyo > > > > utu.be%2F_S_bGAuTN0s&data=02%7C01%7Cralph.stirling%40wallawa > > > >lla.e > > > > du%7C0265e9685d1045bffa2d08d84dd8d507%7Cd958f048e43142779c8debfb > > > >75e7a > > > > a64%7C0%7C0%7C637344940967684006&sdata=KQJ%2FlpumQz5iWRCzjlF > > > >JAiHU uZxu3%2B70Ino%2BDmeSS%2Fw%3D&reserved=0 > > > > > > > > On Tue, Jul 14, 2020 at 3:13 AM andy pugh <bodge...@gmail.com> wrote: > > > >> (Off topic, but interesting) > > > >> > > > >> On Tue, 14 Jul 2020 at 02:11, Gregg Eshelman via Emc-users > > > >> > > > >> <emc-users@lists.sourceforge.net> wrote: > > > >> > Used to be mechanical drive attachments for some lathes to > > > >> > move the > > > >> > > > >> cross slide in and out for cutting threads for taps. > > > >> > > > >> Yes, Holbrook used to offer a sub-speed head (clamped to the > > > >> bed, connected to the spindle, output a speed lower by a factor > > > >> of 6 on a coaxial secondary spindle nose) and a set of > > > >> relieving equipment (special top slide , back power shaft, sets > > > >> of cams) > > > >> > > > >> A mesmerising device for other lathes was developed by the > > > >> model engineering community, the Eureka attachment. > > > >> https://nam05.safelinks.protection.outlook.com/?url=https%3A%2F > > > >>%2Fw > > > >> ww.youtube.com%2Fwatch%3Fv%3DU_kqi3dqr50&data=02%7C01%7Cral > > > >>ph.st > > > >> irling%40wallawalla.edu%7C0265e9685d1045bffa2d08d84dd8d507%7Cd9 > > > >>58f04 > > > >> 8e43142779c8debfb75e7aa64%7C0%7C0%7C637344940967684006&sdat > > > >>a=YyK > > > >> O%2F3Z2GDN3fsitUe%2B8pJgdoib%2Fs4Paz7wWTVXXVAo%3D&reserved= > > > >>0 > > > >> > > > >> It almost seems like a shame to do it with CNC now. > > > >> > > > >> -- > > > >> atp > > > >> "A motorcycle is a bicycle with a pandemonium attachment and is > > > >> designed for the especial use of mechanical geniuses, > > > >> daredevils and lunatics." > > > >> — George Fitch, Atlanta Constitution Newspaper, 1912 > > > >> > > > >> > > > >> _______________________________________________ > > > >> Emc-users mailing list > > > >> Emc-users@lists.sourceforge.net > > > >> https://nam05.safelinks.protection.outlook.com/?url=https%3A%2F > > > >>%2Fl > > > >> ists.sourceforge.net%2Flists%2Flistinfo%2Femc-users&data=02 > > > >>%7C01 > > > >> %7Cralph.stirling%40wallawalla.edu%7C0265e9685d1045bffa2d08d84d > > > >>d8d50 > > > >> 7%7Cd958f048e43142779c8debfb75e7aa64%7C0%7C0%7C6373449409676939 > > > >>98&am > > > >> p;sdata=T%2BZi6NNszQWzOak8rHXMnlDT%2FRUu8QQCP0mZYkAqsdk%3D& > > > >>reser ved=0 > > > > > > _______________________________________________ > > > Emc-users mailing list > > > Emc-users@lists.sourceforge.net > > > https://nam05.safelinks.protection.outlook.com/?url=https%3A%2F%2F > > >list > > > s.sourceforge.net%2Flists%2Flistinfo%2Femc-users&data=02%7C01% > > >7Cral > > > ph.stirling%40wallawalla.edu%7C0265e9685d1045bffa2d08d84dd8d507%7C > > >d958f > > > 048e43142779c8debfb75e7aa64%7C0%7C0%7C637344940967693998&sdata > > >=T%2B Zi6NNszQWzOak8rHXMnlDT%2FRUu8QQCP0mZYkAqsdk%3D&reserved=0 > > > > > > > > > _______________________________________________ > > > 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) > > If we desire respect for the law, we must first make the law > > respectable. - Louis D. Brandeis > > Genes Web page <http://geneslinuxbox.net:6309/gene> > > > > > > _______________________________________________ > > Emc-users mailing list > > Emc-users@lists.sourceforge.net > > https://lists.sourceforge.net/lists/listinfo/emc-users > > _______________________________________________ > 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) If we desire respect for the law, we must first make the law respectable. - Louis D. Brandeis Genes Web page <http://geneslinuxbox.net:6309/gene> _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
