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%40wallawalla.e > >du%7C0265e9685d1045bffa2d08d84dd8d507%7Cd958f048e43142779c8debfb75e7a > >a64%7C0%7C0%7C637344940967684006&sdata=KQJ%2FlpumQz5iWRCzjlFJAiHU > >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%7Cralph.st > >>irling%40wallawalla.edu%7C0265e9685d1045bffa2d08d84dd8d507%7Cd958f04 > >>8e43142779c8debfb75e7aa64%7C0%7C0%7C637344940967684006&sdata=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%7C0265e9685d1045bffa2d08d84dd8d50 > >>7%7Cd958f048e43142779c8debfb75e7aa64%7C0%7C0%7C637344940967693998&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%2Flist >s.sourceforge.net%2Flists%2Flistinfo%2Femc-users&data=02%7C01%7Cral >ph.stirling%40wallawalla.edu%7C0265e9685d1045bffa2d08d84dd8d507%7Cd958f >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
