ABSTRACT
There are two basic principles that tool designers must consider, tool functionality and operator interface. Equipment is designed to perform certain functions that increase the systems’ efficiency. If the equipment does not perform, then it provides little use. Operator interface is a path that has not been as well traveled as the functionality path. In this case study, we will look at the manner in which a powered hand tool was designed to reduce worker fatigue. In order to minimize some risk factors associated with a manual straight knife, a powered rotary knife was designed. By powering the blade of the knife the force required to cut product was significantly reduced. The handle was designed with a lobe shape to significantly minimize forces on the 4th and 5th digits along with utilizing a rubber material, Santoprene®, to reduce soft-tissue compression and damp vibration.
