The device null which is used for the production of the valve for the liquid pressure power steering gear

摘要

An apparatus for measuring and recording the angular position of the edges of axially extending grooves (18) disposed on an inside cylindrical bore surface or outside cylindrical surface of a workpiece (10) characterized in that the apparatus includes a shoe (82), pressed into intimate contact with the surface over a zone (85) of the shoe, the zone (85) incorporating an orifice (84), extending away from the zone (85) of intimate contact to a plenum chamber (88, 97), to which fluid is supplied, relative rotation between the workpiece (10) and the shoe (82) being produced, a measuring device (not shown) to measure the degree of restriction to flow of fluid from the orifice (84) as the edges traverse the orifice (84) during relative rotation, an angular positional measurement device (not shown) to measure relative rotation, such that relative angular positions of the workpiece are recorded at each relative rotational position corresponding to a predetermined degree of restriction of the orifice (84) as successive edges of the grooves traverse the orifice (84).