Hi Mathew, I want to be able to swap easily and quickly between R8 and TTS. Here's a selection of some of the tooling.
http://www.autoartisans.com/mill/ToolSelection.jpg There's a full set of R8 collets of course. The spring loaded Tap Holder has a 3/4" shank so it really just needs a TTS collar to make it full TTS. The two gear cutter arbours for the different sized cutters. Face mill. Changing from a 1/4" drill bit means I have to swap out the TTS to install the R8 based expensive 16mm JT3 ball bearing chuck. To change completely over to TTS is expensive. To change to a mill with a NMBT or CAT cone type is really expensive. The lowest cost power toolbar system was the butterfly wrench and air cylinder. Cost escalated as the ordered electric pneumatic valves just never showed up from China so I went local. Not really expensive but it adds up as do all the fittings. At this point I could see spending as much as $150 Cdn. for the planetary gear and stepper combination. Still way less expensive than fully switching over to TTS which I probably will over time but not all in one shot. And I'm not sure the TTS wouldn't slip with the 5/8" chuck holding a 1" reduced shank drill bit. First step now is to wait for the 12 point deep socket. John > -----Original Message----- > From: Matthew Herd [mailto:herd.m...@gmail.com] > Sent: November-22-21 10:49 AM > To: Enhanced Machine Controller (EMC) > Subject: Re: [Emc-users] Spindle positioning. > > 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 _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
