Shaft phasing gearboxes can be used for more than just registration and timing applications. In this example, this customer found a unique solution by incorporating this dual input gear drive design to reciprocating motion. 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 slowing down the gearbox output speed relative [...]