Abstract: Apparatus for converting rotary motion into reciprocating linear motion utilizing a plurality of magnetic segments secured to a rotary member; a pair of magnets affixed to a reciprocating member to be acted upon as the rotary member moves and a pair of fixed magnetic members, disposed outside of the magnets attached to the reciprocating member to control the length of stroke and return speed of the reciprocating member. The plurality of magnetic segments are supported from the rotatable member for rotation therewith. The elongated member has the linear movable magnets secured thereto. As the rotatable member revolves, the magnetic segments either repel or attract the magnets attached to the linear movable member causing reciprocating linear motion. Aligned with, but mounted outside of the linear movable magnets, are a pair of magnetic stop members. These stop or push block magnets limit linear movement of the elongated member and provide a return force on the linear movable magnets.