I think I'd rather just fix the washer stack/clamping issue. Repeatable, easy tool changes is so worth the effort.
Todd Zuercher P. Graham Dunn Inc. 630 Henry Street Dalton, Ohio 44618 Phone: (330)828-2105ext. 2031 -----Original Message----- From: Dave Engvall <dengv...@charter.net> Sent: Tuesday, March 19, 2024 11:18 AM To: Enhanced Machine Controller (EMC) <emc-users@lists.sourceforge.net> Subject: Re: [Emc-users] Not so slight problem with spindle/tools [EXTERNAL EMAIL] Be sure links are safe. Indeed, using drive dog threaded holes. Initially I did think about a flat disc but cannot see that gives me any better holding strength than the dogs with a slight tee on top so one gets both drive and cat40 retention. The other problem is keeping the spindle from rotating while I torque down the tool. Tool holder is a Cat40 SK16 which gives me better rigidity than a ER collet. The concept is to use AlCrN coated tools with coolant in hopes of getting decent tool life. A local shop is getting about 5000 feet of path length/cutter but also using coolant! Even with light cuts that is moving a lot of material in my case 8620 or 20 carbon steel, not too challenging. > On Mar 18, 2024, at 5:26 PM, andy pugh <bodge...@gmail.com> wrote: > > On Mon, 18 Mar 2024 at 21:13, Dave Engvall <dengv...@charter.net> wrote: > >> So I’ve built Tee-nuts that will retain the cat40 assuming the >> M6 shcs hold. Planned use is to use small tools at max spindle speed. >> (4K). I need ideas to clamp the cat40 so I can torque down tool while >> in the spindle. >> > > I am not 100% sure what you are describing. > > Are you saying that you are using some tapped holes in the spindle > face to hold Tee nuts to retain the tooling? Or are you maybe using > the drive dog threaded holes? > > Whilst a proper repair to the drawbar seems like the correct fix, I > think that a machined ring to retain an ER collet holder might be > better than what I think you are describing. > > (Then you can just swap tools and collets) > > -- > 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://list/ > s.sourceforge.net%2Flists%2Flistinfo%2Femc-users&data=05%7C02%7Ctoddz% > 40pgrahamdunn.com%7C1d89087e4afa4f525de208dc4827e52d%7C5758544c573f47c > ebee96c3e0806fb43%7C0%7C0%7C638464583399170359%7CUnknown%7CTWFpbGZsb3d > 8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C > 0%7C%7C%7C&sdata=qu%2FmUEH7qsgy%2BQuI05lJwjYTsJ7jycTBFHv51Gf33qI%3D&re > served=0 _______________________________________________ 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
