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A centering device and method includes a sensor for sensing the center of a bore preformed in a workpiece, and a remote output unit for outputting the positional signal generated by the sensor. The sensor in held within a spindle of a machine tool and includes a stylus which contacts the inner surfa

A centering device and method includes a sensor for sensing the center of a bore preformed in a workpiece, and a remote output unit for outputting the positional signal generated by the sensor. The sensor in held within a spindle of a machine tool and includes a stylus which contacts the inner surface of the bore, a local oscillator and modulator and an RF oscillator and antenna. The stylus oscillates a linear proximity sensor. The proximity sensor outputs a proportional DC voltage which is input to a voltage controlled oscillator (VCO) which outputs a square-wave with a frequency which is a function of the stylus position. The RF oscillator and antenna includes a radio transmitter and antenna and receives the square-wave output of the VCO, converts the square-wave to a modulated RF signal and transmits the modulated RF signal to the remote output unit. The remote output unit includes an RF receiver and demodulator, and a signal processor and output and display. The RF receiver and demodulator includes an antenna for receiving the modulated RF signal and a radio receiver and demodulator which outputs a demodulated square-wave. The signal processor and output display includes a two-stage amplifier which amplifies the demodulated square-wave, a tachometer circuit which converts the frequency of the demodulated square-wave to a voltage for display on an analog meter, and an audio output circuit which outputs an audio signal with a frequency proportional to the frequency of the demodulated square-wave.

대표청구항 ▼

[ I claim:] [1.] A centering device for determining the concentricity of a workpiece relative to a machine tool, said centering device comprising:sensing means mounted to the machine tool adjacent the workpiece for sensing the position of the centering device relative to the workpiece;a stylus pivot

[ I claim:] [1.] A centering device for determining the concentricity of a workpiece relative to a machine tool, said centering device comprising:sensing means mounted to the machine tool adjacent the workpiece for sensing the position of the centering device relative to the workpiece;a stylus pivotally mounted on the sensing means and having a first end which is biased outwardly away from a center axis of the workpiece, said first end of the stylus being adapted to maintain continuous contact with the workpiece while the sensing means is sensing the position of the centering device relative to the workpiece;modulated signal generating means for generating a modulated signal proportionate to the position of the sensing means;oscillating means for converting the modulated signal to an oscillating signal;converting means for converting the oscillated signal to a transmittable signal;transmission means for transmitting the transmittable signals; andreceiver means for receiving the transmittable signal which receiver means is positioned at a discrete location relative to the sensing means and for outputting a signal to convey the position of the workpiece relative to the machine tool.