Abstract: Apparatus is provided for enlarging metal rings using a hydraulic press having a piston and anvil including a pair of generally parallel arms adapted to fit between the piston and anvil and be acted on intermediate their ends. The arms are maintained in a parallel relationship by a linkage arrangement. A pair of opposed work surfaces at one end of said parallel arms outside the press are adapted to receive a ring to be enlarged. A compensating hydraulic cylinder between the other ends of said parallel arms act between said ends to maintain said arms in parallel relationship with minimum pressure on said parallel linkage.

Abstract: A forging press is provided having two U-shaped vertical frame components on opposite sides of the forging axis and at an angle thereto connected to a top and a bottom transom by at least four tie rods extending from the top to the bottom transom and within the U-shaped vertical members so as to be shielded from radiant heat of the work. Strain gauges are provided on the tie rods to measure and control tension.