> > This is quite true, and if it can't be fixed, I will be forced to > > install a smash it switch that interrupts machine power. But I've > > some pretty high cap supplies that can keep it moving for several > > seconds after the switch has been fisted. A software e-stop OTOH can > > stop it dead in the water in a very few milliseconds. > > That sounds trivial to fix. Have the red stop button operate relays > that interrupt the circuits exactly where the software would.
Often with high power motors like this, interrupting the power causes them to gradually spin down to a stop thanks to inertia, but what the software does is provide electronic braking by changing the motor control pulses so that the motor is actively slowed down to a stop very, very quickly - which of course requires the power to be on to do that. This can stop the spindle in a fraction of the time compared to what you'd get by cutting the power. What you really need is an e-stop switch where the software is signalled immediately, but the relays or whatever is controlling the power supply are switched off only after a short delay of a few tens of milliseconds. This would give the software time to electrically brake the spindle and only if that fails does the power get cut and the spindle free-spin to a gradual stop as a last resort. Cheers, Adam. _______________________________________________ xorg@lists.x.org: X.Org support Archives: http://lists.freedesktop.org/archives/xorg Info: https://lists.x.org/mailman/listinfo/xorg Your subscription address: %(user_address)s
