METHOD AND APPARATUS FOR INDICATING AN APPARENT ERROR IN THE OPERATION OF A FLUID-POWERED THREAD-FORMING ATTACHMENT
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United States of America Patent
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Issued Date -
Sep 29, 2005
app pub date -
Mar 23, 2004
filing date -
Mar 23, 2004
priority date (Note) -
Abandoned
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Abstract
The invention provides an improved method and apparatus for indicating an apparent error in the operation of a fluid-powered thread-forming attachment (A) mounted on a machine tool for controlled movement toward and away from a workpiece (W) upon which a thread is to be formed during a thread-forming cycle. The improved apparatus (60) broadly includes a fluid-powered actuator (64) for selectively moving the thread-forming attachment (A) relative to workpiece (W) during the cycle; a sensor (73) operatively arranged to monitor the pressure within the actuator during at least a portion of the cycle, and arranged to provide an output signal; and a programmable logic unit (75) provided with the sensor output signal, arranged to store minimum and maximum permissible fluid pressure values expected during the cycle, and operatively arranged to indicate an apparent error in the formation of a thread on the workpiece if the pressure determined by the sensor is not between the stored minimum and maximum values.
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