Profile: Motion Systems Corporation manufactures electromechanical linear actuators. High efficiency epicyclic ball screws provide integral freewheeling at stroke ends. Our applications include dental chairs, medical, handicap and material handling equipment, valve operators and ergonomic systems. The motion 85615/85616 ball drive actuator provides a miniature package, in which 85615 uses a translating tube for mounting while 85616 is an open screw type unit where attachment is made directly to the ball nut