Section R. 408.14251 - Forging pressesRule 4251.
(1) Forging press operating valves shall be located so that the operator will have a clear and unobstructed view of the press when standing in the usual operation position. If this arrangement is impossible, a mirror shall be installed in front of the operator to assist him in obtaining a full view of the press.(2) When dies are being changed or maintenance is being performed on a press, the following shall be accomplished: (a) The energy source to a mechanical press shall be locked out, and the flywheel shall be at rest before work begins.(b) The hydraulic pumps and power apparatus of the hydraulic press shall be locked out.(c) Blocking shall be provided and used to prevent the ram from dropping. The material shall equal or exceed specifications in table 1. Die design shall take into consideration the need for a flat spot for the block.
(3) Location of steam, air, or water headers and scale or splash aprons shall give the operator sufficient clearance at the front of the forging press for any upward or downward movement of the tongs without creation of a pinch point between these facilities and the tongs.(4) A hot forging press shall be equipped with a scale guard, as prescribed in R 408.14241(3).(5) A forging press shall be provided with a positive means for retaining a piston and head assembly inside the counterbalance cylinder in case of failure or breakage of the piston and rod assembly.(6) An electrical motor shall be provided with a disconnect switch, as prescribed in R 408.14247(1). A hydraulic forging press shall be equipped with a positive type lockout disconnecting switch or valve.(7) Fire resistant fluids shall be used in a hydraulic press forming hot work.(8) Die bolts shall not be worn or damaged, and shall be long enough to permit being threaded into die bolt holes a distance not less than 1 1/2 times the diameter of the bolt. Washers shall not be used in multiple to compensate for excessive lengths of bolts.(9) A mechanical foot pedal or foot switch shall be covered on both sides and top with a substantial guard to prevent accidental tripping. The guard shall have rolled, broad, or covered edges to prevent injury or discomfort. The mechanical foot pedal shall be mounted to a press leg or anchored to the floor.Mich. Admin. Code R. 408.14251