Abstract: The present invention provides an apparatus for treating the surface of a radome, comprising: a rotary driving unit; a vacuum suction unit; a vertical driving unit; and a surface treatment unit. The rotary driving unit comprises: a rotary shaft; and a driving motor, installed at a predetermined portion spaced apart from the rotary shaft. The vacuum suction unit comprises: a plurality of first hydraulic cylinders positioned on the rotary shaft in the circumferential direction; and a suction plate equipped at an end of a piston rod of each of the first hydraulic cylinders. The vertical driving unit comprises: a mounting plate having a hole formed in the central portion thereof. The surface treatment unit comprises: a support column vertically installed on a predetermined portion spaced apart from the mounting plate; and a support arm.

Abstract: A machine for grinding the metering edge contours on edges of axially extending grooves of a power steering valve input-shaft by means of a cylindrical grinding wheel, the machine being constructed to hold and rotate the input-shaft and to increase and decrease cyclically the distance between the axis of the input-shaft and the grinding wheel several times during the revolution of the input-shaft to grind metering edge contours to produce symmetrical sets of clockwise and anticlockwise metering edge contours. The input-shaft is centrelessly supported by means of surfaces tangentially contacting the outside diameter of the input-shaft. Two such surfaces are axially displaced on either side of the ends of the grooves in the input-shaft and are arranged one on each side of the grinding wheel on that side of the input shaft adjacent the grinding wheel.