Method for determining the angular position of a workpiece and positioning the same
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United States of America Patent
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Apr 14, 1987
Grant Date -
N/A
app pub date -
Sep 12, 1984
filing date -
Sep 12, 1984
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A method and apparatus for determining the angular position of a workpiece and for positioning the same relative to at least one tool. The workpiece has at least one set of teeth. In a first measuring operation, a measuring wheel having a tooth construction is made to mesh with a set of teeth of a reference workpiece. Pulses are derived from the rotating measuring wheel and from a reference shaft which has a known gear ratio with the measuring wheel, and consequently also turns. A first phase measurement is undertaken between the pulses, the result of which is stored as the reference value. The reference workpiece is replaced with a workpiece which is to be machined and which is provided with teeth. A second phase measurement between the pulses of the reference shaft and of the measuring wheel are undertaken in a second measuring operation. The reference value of the first phase measurement is compared with the result of the second phase measurement. The workpiece is turned relative to the reference shaft in conformity with the difference between the two measured values.
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