Method and apparatus 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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Feb 20, 1990
Issued Date -
N/A
app pub date -
Nov 28, 1986
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. Pulses are derived from a rotating reference workpiece and from a reference shaft which has a known gear ratio with the reference workpiece, 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 refernece shaft and of the reference workpiece are undertaken in a second measuring operation. The reference value of the first phase meaasurement 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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