What about a custom draw bar with an Andy Pugh style air cylinder release? Seems simpler to engineer the mechanism than do all this control. Just have a drawbar that’s normally retracted with a flange. Engage the flange with a mechanism on an air cylinder to release.
https://m.youtube.com/watch?v=mZWQvq-X7DQ I think you could probably adapt the idea without the need to make your own air cylinder, but the idea is sound. No need to invent pull studs or pull stud fingers either. Just thread the other end of the draw bar into the collet. Preferably with some Loctite or a similar solution. Matt > > On Nov 22, 2021, at 7:06 AM, Roland Jollivet <roland.jolli...@gmail.com> > wrote: > > You probably don't need more than 1 bar on the lifting air cylinder, up or > down. No need to force it down. > So let it down, then if you can give the spindle a 1RPM burst to let the > nut slip over. > And have a switch on driver Z to know if it's down over the nut. > > You could also stop the spindle and descend the driver as the spindle > reaches it's last 5RPM? before stopping. > > Roland > _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
