Shaft-phasing gearboxes can be used for more than just registration and timing applications. In this example, the customer discovered a unique application for shaft-phasing gearboxes, using their dual input gear drive design to achieve reciprocating motion, beyond traditional registration and timing applications. Shaft-phasing gearboxes go by a variety of names - including speed correction drives and timing differentials. The differential moniker came from the original bevel gear designs, with side spider gears, that could be rotated with or against the direction of the main drive gears. This had the effect of speeding up or [...]