translating device a force feedback mechanism is disposed between the actuator mechanism and the proportional valve arrangement and provides a more precise and repeatable displacement control application_number US 30155902 A description referring to fig1 and 2 a diagrammatic free body representation of a fluid translating device 10 is illustrated the fluid translating device 10 hereinafter referred to as u2018 the pump u2019 includes a barrel 12 rotatable about a pump axis 14 the barrel has a plurality of equally spaced circumferentially arranged piston bores 16 provided therein each one of a plurality of pistons 18 is reciprocatably disposed in the respective piston bores 16 a swash plate 20 is conventionally mounted adjacent one end of the barrel 12 for tilting movement about a swash plate axis 22 to adjust the stroke of the respective pistons the swash plate 20 is continuously biased towards the maximum displacement position by a spring 24 a stationary head 26 is disposed at the other end of the barrel 12 and has an intake passage 28 and a discharge passage 30 a ball and socket joint 31 connects the base of each piston 18 to a slipper 32 that is maintained in sliding contact with the swash plate 20 in a known manner the centers of the ball and socket joints 31 are coincident with the swash plate axis 22 as best illustrated in fig2 a flat timing port plate 34 is disposed between the barrel 12 and the stationary head 26.