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
