Servo Valve Work

Some work was in order to begin testing the servo motor ball valves properly with a specifically machined coupling to interface the the servo shaft to the ball valve stem. A .3125" hole was drilled in the center of one side for the servo shaft to a depth of roughly .600". On the opposite face, a .305" slot was milled roughly .400" deep to accept the square end of the valve stem. A 1/4-20 tapped hole for a set screw was threaded in the servo shaft hole. This will probably be changed to a larger 3/8-24 set screw so there is limited play in the coupling and it will also eliminate the small key that was designed to fit in there.