Hi John, You don’t need pull studs on the R-8 collets, just thread the draw bar into the collet. Either until it stops or loctite the draw bar at the right depth. Then use a Belleville washer and air cylinder setup like Andy’s.
Matt > On Nov 22, 2021, at 1:32 PM, John Dammeyer <jo...@autoartisans.com> wrote: > > It's the lowering of the wrench that I don't have a lot of control on. It's > pushed down hard enough to keep the draw bar on top of the spindle so as it > turns it pushes the sometimes a bit stiff R8 all the way down and out. If > it's allow to move upwards (or I haven't locked the quill) then the drawbar > may unthread but I then have to push on the draw bar. > > A sensor on the Z down may be what has to happen. Then repeated tries with > blipping the air wrench until it goes down all the way is an option. > > Making a draw bar from oil hardening steel and hardening the head a bit so it > doesn't get carved away and ends up more slippery might also be a requirement. > > John > > >> -----Original Message----- >> From: andy pugh [mailto:bodge...@gmail.com] >> Sent: November-22-21 5:41 AM >> To: Enhanced Machine Controller (EMC) >> Subject: Re: [Emc-users] Spindle positioning. >> >>> On Mon, 22 Nov 2021 at 08:03, John Dammeyer <jo...@autoartisans.com> wrote: >>> >>> One still has to line up the socket to the hex head of the drawbar. And >>> since it can be at any position relative to the spindle the >> sensing has to happen against the hex head. Rotate spindle until hex head >> is at a known position. >> >> How about: >> >> Lower the wrench, but don't turn it on. >> Rotate the spindle until the wrench drops down to the "engaged" height >> (sensor on the slide) >> Then operate the wrench. >> >> -- >> 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://lists.sourceforge.net/lists/listinfo/emc-users > > > > _______________________________________________ > 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
