Title: Quick response circuit for control of a machine tool apparatus

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Abstract: A circuit for controlling the application of an error compensation circuit in a feedback control system which in turn automatically controls the feedrate of a machine tool apparatus such as a milling machine. Sensors positioned adjacent the spindle of the apparatus measure the amount of force on the spindle under load conditions, and provide an electrical signal output. The electrical signal includes an error component, substantially caused by the revolving mechanial components of the apparatus, such as the spindle, being out of true. If the electrical signal provided by the sensors does not exceed a pre-established threshold voltage, a low-pass compensation filter is applied in the feedback control system, removing the error component but introducing a time constant into the electrical signal and hence a delay in feedback control. If the pre-established threshold voltage is exceeded, however, certain portions of the low-pass filter are bypassed, eliminating the time constant delay and providing a quick feedback control response to large and potentially harmful magnitudes of spindle load.


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