Ultrasonic-acoustic grinding wheel setting station for automatic numerically-controlled machines
A precisely machined metal ball is supported at a reference position on a numerically controlled grinding machine. The ball is displaceably carried by a metal holder having a conical shaped seat machined to support the ball. The holder is mounted at the reference position on the machine by means of a phenolic support to attenuate extraneous ultrasonic vibrations induced in the machine base. A piezoelectric crystal is acoustically coupled to the ball holder to sense ultrasonic vibrations induced in the ball and transmitted through the holder when the grinding wheel touches the reference ball. The ultrasonic frequency electrical signal output of the crystal is sensed by an ultrasonic detection circuit which produces a dc output signal having an amplitude proportional to the ultrasonic signal amplitude. The dc signal may be used to signal the numerical controller to stop the grinding wheel positioning mechanism when a predetermined level dc signal is sensed to indicate that the grinding wheel is positioned at the reference point along the axis. (auth)
- Assignee:
- U.S. Energy Research and Development Administration
- Patent Number(s):
- US 3897659
- OSTI ID:
- 7361138
- Resource Relation:
- Patent File Date: Filed date 30 Aug 1974; Other Information: PAT-APPL-501,899
- Country of Publication:
- United States
- Language:
- English
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