Abstract: The present invention is an EDM (Electrical discharge machining) process and apparatus for machining an electrode workpiece by means of an electrode tool wherein the electrodes are displaced relative to each other along a principal feed axis while, simultaneously, the electrodes are displaced relative to each other along an orbital path in a plane perpendicular to the principal feed axis, such as to produce between the electrodes a three-dimensional translation motion, and for providing between the electrodes an average machining gap wider than the gap width sustaining electrical discharges. The invention provides a control of the amplitude of the relative translation motion of the electrodes while displacing the direction of said motion as soon as a predetermined orbiting path limit is reached such as to allow a rapid increase of the gap between the electrodes when the electrode tool is retracted.

Abstract: A pair of cooperating elongated cutting members is mounted on the frame of a harvester for reciprocation along a common plane located intermediate the cutting members by means of arms pivotally connected to the frame and to the cutting members. A lever is pivoted to each of the cutting members and to the frame and has the same effective length as the associated arm, the pivot points of the associated arm and lever being located in the corners of an imaginary parallelogram. A crank drive moves a pair of connecting rods which are articulated to the respective levers intermediate the pivot points thereof. The cutting members have a plurality of recesses which are laterally bounded by cutting edges extending transversely of the elongation of the respective cutting members so that the objects which enter into the recesses are cut by the cutting edges in the common plane. The axis of rotation of the crank may be vertical, while the levers and arms may reciprocate in parallel horizontal planes.

Abstract: In order to join two coils of wire to form a single continuous longer coil, the two coils are placed on side flaps of a table, the ends of the coils welded together and the flaps raised to push the coils together to interengage their turns to form a single continuous unitary longer coil.