It's not what you asked, but what about a centrifugal clutch/limiter? Above say 200RPM it could swing outwards and lock, only releasing again once the torque is removed.
On Sun, 21 Nov 2021 at 09:45, John Dammeyer <jo...@autoartisans.com> wrote: > Has anyone ever tried any sort of closed loop control of an air motor > similar the one on this butterfly impact wrench. > https://www.penntoolco.com/52-424-9/ > In order to not have both the TTS and R8 collet drop out of the spindle > I'd like to be able to limit the number of turns to 2. > > What I've found however, is that 10mS pulses to the valve supplying air > for CCW rotation barely move it until it's unloaded and then it immediately > spins up very fast and does at least 4 to 8 turns. That's way too many. > > I've only got a one pulse per rev hall sensor detecting a magnet on the > socket. But I suspect between reaction time of the valve, the > compressibility of air and the rotary inertia of the motor that unless > there is some sort of constant load that control is pretty well impossible. > > With servos, if the motor is loaded and then suddenly totally unloaded, it > too might turn a number of revolutions before the control system could > bring it back down to the original speed. > > Short of adding some sort of mechanical brake am I trying to do the > impossible? Oh and to avoid another 1000 words to explain I've added a > picture. > John > > _______________________________________________ > 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
