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 ________________________________________ 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%2Fyoutu.be%2F_S_bGAuTN0s&data=02%7C01%7Cralph.stirling%40wallawalla.edu%7C0265e9685d1045bffa2d08d84dd8d507%7Cd958f048e43142779c8debfb75e7aa64%7C0%7C0%7C637344940967684006&sdata=KQJ%2FlpumQz5iWRCzjlFJAiHUuZxu3%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%2Fwww.youtube.com%2Fwatch%3Fv%3DU_kqi3dqr50&data=02%7C01%7Cralph.stirling%40wallawalla.edu%7C0265e9685d1045bffa2d08d84dd8d507%7Cd958f048e43142779c8debfb75e7aa64%7C0%7C0%7C637344940967684006&sdata=YyKO%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%2Flists.sourceforge.net%2Flists%2Flistinfo%2Femc-users&data=02%7C01%7Cralph.stirling%40wallawalla.edu%7C0265e9685d1045bffa2d08d84dd8d507%7Cd958f048e43142779c8debfb75e7aa64%7C0%7C0%7C637344940967693998&sdata=T%2BZi6NNszQWzOak8rHXMnlDT%2FRUu8QQCP0mZYkAqsdk%3D&reserved=0 >> > _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://nam05.safelinks.protection.outlook.com/?url=https%3A%2F%2Flists.sourceforge.net%2Flists%2Flistinfo%2Femc-users&data=02%7C01%7Cralph.stirling%40wallawalla.edu%7C0265e9685d1045bffa2d08d84dd8d507%7Cd958f048e43142779c8debfb75e7aa64%7C0%7C0%7C637344940967693998&sdata=T%2BZi6NNszQWzOak8rHXMnlDT%2FRUu8QQCP0mZYkAqsdk%3D&reserved=0 _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
