Abstract: A rotational control apparatus (A) having a rotatable input (26 or 180) and output (26 or 180) with respective interface discs (106, 180). Three sets of two diametrically opposed pistons (64 and 66, 68 and 70, 72 and 74) are controllable to rotatably relate the interface discs (106, 180). The piston sets (64 and 66, 68 and 70, 72 and 74) include piston heads (76) with dissimilar diameters such that each of the sets of pistons (64 and 66, 68 and 70, 72 and 74) may apply a dissimilar torque for a given amount of air pressure. Each of the piston sets (64 and 66, 68 and 70, 72 and 74) may be actuated independently or in combination with each of the other sets of pistons (64 and 66, 68 and 70, 72 and 74) such that the interface discs (106, 180) may be rotatably related to each other with varying degrees of torque.

Abstract: A punch holder and stripper assembly is shown in which a punch holding body is provided with a reduced outer diameter boss section projecting therefrom terminating in an end face which has a bore opening thereinto which receives the punch, the punch projecting from the reduced diameter section of the holder and terminating in a punching face. An elastomeric stripper, preferably of a type of urethane rubber, is attached to and carried by the punch holder. The stripper has an inner diameter received around the reduced diameter portion of the holder and extending beyond the holder in radially spaced relationship with the projecting portion of the punch. The stripper either terminates adjacent the punching face or is equipped with an end cap terminating adjacent the punching face.