The biggest downside I see is loading you're putting on the spindle bearings. On one machine we have, when we change to a different system where we went from changing tools by wrenching on the spindle a couple of times a week to no tool collet changes (insert tooling), spindle life more than tripled. Spindles used to last 2-3 years and I haven't had to change one since.
Todd Zuercher P. Graham Dunn Inc. 630 Henry Street Dalton, Ohio 44618 Phone: (330)828-2105ext. 2031 -----Original Message----- From: andy pugh [mailto:bodge...@gmail.com] Sent: Tuesday, July 17, 2018 10:01 AM To: Enhanced Machine Controller (EMC) <emc-users@lists.sourceforge.net> Subject: Re: [Emc-users] frank hermann xatc extremely simple automatic tool changer On 17 July 2018 at 14:25, Gene Heskett <ghesk...@shentel.net> wrote: > 'twouldn't work on my machine. Incapable of loosening any collet/nut > combo I own in 1/4 turn. 2 turns maybe, and in any event could only > tighten a collet to about 5% of the torque it needs to adequately hold > a tool. That depends purely on the diameter of the disc and the axis force. It uses the axis move to crack the collet free, then spins the spindle to loosen further. And there is no reason that the rotary move couldn't be more than a quarter turn. ER20 wants 80 Nm. If the disc is 100mm radius then it needs an axis force of 800N, or 80kg. If the ballscrew on the axis is 5mm pitch then that implies a motor torque of 0.6Nm. So even a relatively small stepper can do it. -- 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, 1916 ------------------------------------------------------------------------------ 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
