Abstract: A program controlled metal cutting torch includes a torch height control system that utilizes a vibration sensor, such as an accelerometer, to provide a signal indicating torch tip contact with the metal workpiece to facilitate an initial height sensing routine or inadvertent torch contact with an obstruction as the torch moves horizontally during its programmed cutting process. In either instance, the vibration signal representative of torch contact is processed to stop the torch drive device and to raise the torch to the proper predetermined height.

Abstract: A soft start, self-powered coupling for connecting a motor to a load, the coupling including a magnetic particle clutch, a generator having a rotor carried by the clutch and a stator, and an electronic control circuit assembly carried by the generator rotor, the magnetic particle clutch being connector to the motor and to the load, the generator powering the electronic control circuit assembly and the clutch to provide linear timed acceleration of the load.