of carry over relay cr3 thereby keeping trip relay winding cr4 energized when the press crankshaft reaches about 20 u00b0 after bottom dead center the detent in cam 285 causes the circuit through switch 279a to open depriving a c power from relay windings cr3w and cr4w thus de energizing air clutch solenoid 243w accordingly the press begins braking to a stop at its stopped position ready for a further stamping cycle the detent in cam 285 once again permits switch 279b to close the circuit between leads 104 and 103a in order to reset the system for another stamping cycle the press operators must remove both hands from actuators 93l and 93r this removes a c power from lead 105 de energizing relay cr2 this permits a c power from lead 102 to be supplied to lead 103 thereby re energizing relay cr1 accordingly the press is ready for another cycle when run jog switch 91 is in the 34 jog 34 position and off run switch 89 is in the 34 off 34 position a c power is supplied to lead 111 and through plug and receptacle means 101 to lead 111 39 extending to normally open contacts of a power jog pushbutton switch pjs and to one side of relay winding cr5w and also by means of a lead 113 to one blade of a two pole double throw jog mode selector switch jms shown in the center off position this switch permits selection of either power jog operation or manual jog operation for power jog operation.