Measuring and recording apparatus using fluid as the measuring media for use in the manufacture of hydraulic power steering valves
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United States of America Patent
Stats
-
Aug 15, 1995
Grant Date -
N/A
app pub date -
Jul 28, 1993
filing date -
Oct 28, 1991
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
An apparatus for measuring and recording the angular position of the edges of axially extending grooves disposed on an inside cylindrical bore surface or outside cylindrical surface of a workpiece is characterized in that the apparatus includes a shoe, pressed into intimate contact with the surface over a zone of the shoe. The zone incorporates an orifice, extending away from the zone of intimate contact to a plenum chamber, to which fluid is supplied. Relative rotation between the workpiece and the shoe is produced. A measuring device measures the degree of restriction to flow of fluid from the orifice as the edges traverse the orifice during relative rotation. An angular positional measurement device measures 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 as successive edges of the grooves traverse the orifice.
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