Thank you Ken! I don't have a Tormach but I do use the Tormach Tooling System on my 2 HP milling machine. I typically use it for machining plastic or aluminum but I've taken serious cuts in steel numerous times and never had any problem with tool pull out. The tool stays in the TTS ER20 collet holder (Tormach brand or the Chinese knock offs) and the TTS tool holder stays in the modified 3/4" R8 collet. When I install a new TTS tool holder, I snug the drawbar with a 3/8" ratchet with a one foot long handle. I don't use the long handle for torque. I use it to clear the head of the milling machine. Similarly, I don't need much torque to loosen the modified R8 collet to remove a TTS tool holder, but I generally do need to tap the top of the draw bar after loosening the drawbar to release the TTS tool holder.
I don't need to use an impact wrench to tighten and loosen the drawbar to prevent TTS tooling from pulling out. Something isn't right there, Gene. Maybe some of the grease you're using on the drawbar threads made its way into the 3/4" interior of the modified R8 collet? On 4/21/19 2:03 PM, Ken Strauss wrote: > I'm very surprised by your comments. > I have a Tormach 770 and the only time that I've had a TTS slip is when I > allowed the power drawbar to become mis-adjusted. Are you ensuring the the > TTS shank is clean and free of grease? What is the size of your spindle > motor? I only have a 1HP spindle motor but it will stall before the TTS > slips. > >> -----Original Message----- >> From: Gene Heskett [mailto:[email protected]] >> Sent: Saturday, April 20, 2019 4:31 PM >> To: [email protected] >> Subject: Re: [Emc-users] ER ATC tool idea >> >> On Saturday 20 April 2019 12:20:53 Jon Elson wrote: >> >>> On 04/19/2019 09:55 PM, Gene Heskett wrote: >>>> I'm doing that now, for big ER's in that sheldon, but I >>>> had the G0704 spindle in mind, I've developed an abiding >>>> hate for R8's and their tool slippage. >>> Hmmm, I've never had tool slippage with R8 end mill >>> holders. I HAVE had slippage on a few occasions using >>> collets in the R8. So, except in unusual circumstances, I >>> ALWAYS put end mills in an R8 holder, instead of a collet. >>> When it did slip, I'm pretty sure I didn't tighten the >>> collet enough, or maybe there was a little chip in there >>> that crushed out, loosening the collet. >>> >>> Jon >>> >> The only way I can be assured that a 3/4" shank of a TTS tool holder will >> not slip, rotating in the R8, is if I put an 8 point 5/16" socket in a >> 20 volt rattle wrench, and let it rattle for most of a second, >> tightening the drawbar bolt about half a turn more that the 10mm end >> wrench supplied can. No way can that 10mm end wrench can ever loosen >> it, and that socket will be cracked in 50 shots of that. I order those >> in 3 packs from grainger. I keep chassis grease on the drawbolts threads >> and under its shoulder. But a TTS shank spins in it so easy you'd swear >> it was teflon coated. I made those tap hats that are keyed to the r8 >> because a 1/4" tap takes enough torque to slip it rotationally either at >> the TTS/R8 interface or the collet to tap. The hats are eyed to a notch >> I cut in th R8's mouth. No slip. >> >> >>> _______________________________________________ >>> Emc-users mailing list >>> [email protected] >>> https://lists.sourceforge.net/lists/listinfo/emc-users >> >> 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) >> Genes Web page <http://geneslinuxbox.net:6309/gene> >> >> >> >> _______________________________________________ >> Emc-users mailing list >> [email protected] >> https://lists.sourceforge.net/lists/listinfo/emc-users > > > > _______________________________________________ > Emc-users mailing list > [email protected] > https://lists.sourceforge.net/lists/listinfo/emc-users > > _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
