On Wed, 3 Oct 2018 at 11:32, andy pugh <bodge...@gmail.com> wrote: > On Wed, 3 Oct 2018 at 06:49, Roland Jollivet <roland.jolli...@gmail.com> > wrote: > > > If only the speed was a lot higher, it would be an awesome spindle motor > > for rigid tapping. > > How much did you pay for it? > What do you imagine would happen if you ran it faster? > > You could always gear it up. Maybe have a 1:1 ratio for tapping and a > speed-up for normal milling. > Either one toothed belt and two sets of (carefully chosen) pulleys or > two permanently-engaged toothed belts with a peg to engage the > high-speed ratio and an over-running clutch on the low-speed one: > This one can do 85Nm: > > https://simplybearings.co.uk/shop/p152524/CSK25PP-25mm-Sprag-Clutch-One-Way-Bearing-with-Internal-&-External-Keyways-25x52x15mm/product_info.html > -- > atp >
I probably paid about $10 for it, as scrap metal, from a CAT scan machine. I remember the scrap yard guys rolling their eyes as I carried it out of there. Junk collector.... I don't know if it could run faster with the correct drive. Maybe back EMF would be a problem? I would like 7000 RPM, but I don't think a 10:1 setup is practical. And surely it's rated 700RPM for a reason. I doubt the magnets are going to fly apart, so what would that reason be? The irony is that I've just got myself a scrapped CNC mill with a missing spindle drive motor, that's why my attention was back on that motor. This is a LinuxCNC candidate so I will document/blog the re-build. The over-drive arrangement would work, but maybe better suited to my lathe. Direct drive for threading, then step-up to ~ 2000RPM max for turning. <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
