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://lists.sourceforge.net/lists/listinfo/emc-users _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
