On Tuesday 20 July 2021 12:37:52 Les Newell wrote: > My Hurco uses an air impact to run the draw bar. It has a small > pneumatic ram to push the driver down to engage the drawbar. > > Les > > On 19/07/2021 22:07, John Dammeyer wrote: > > Here's the basic rendering. Now I can redesign it to better fit the > > mill. It's possible I could add a flip down latch that only allows > > one turn in the CCW direction. Before lowering onto the bolt head > > spin it CW against the other side of the stop. Then push down the > > socket over the draw bar bolt head. Spin CCW until it hits the stop > > which should be close to one turn and should release the TT Holder. > > Or set a latch so it does one rev and then the stop flips down to > > stop it on the second turn.\ > > > > All those years of repairing IBM Selectric Typewriters might just > > come in handy for coming up with a novel solution. > > > > Or just use a stepper motor and 100:1 planetary gear module. > > John
My tool changeer on the G0704 (r8 spindle) is still 2 armed, with the right one running a Porter-Cable impact screwdriver/drill with an 8 point socket on the drawbar bolt. If If were to let it rattle long enough, it would stretch or strip the drawbar. I can't begin to put that much pull on it with the supplied hand wrench. And my TTS tools, including a 5/8 chuck with a 1" bit in it, don't slip. 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 [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
