US Patent: 4,676,030 - Apparatus and Method for Detecting a Tool Edge


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US Patent: 4,676,030

Apparatus and Method for Detecting a Tool Edge

Patentee:

Harold W. Lawson, Jr. (exact or similar names) - Shelton, Fairfield County, CT

USPTO Classifications:

451/11, 451/21, 451/22, 451/28, 451/5, 451/9

Tool Categories:

metalworking tools : machinist tools : electronic gauges

electrical devices : computer apparatus and systems

Assignees:

None

Manufacturer:

Not known to have been produced

Witnesses:

Unknown

Patent Dates:
Applied:	Sep. 02, 1986
Granted:	Jun. 30, 1987

Patent Pictures:

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Description:

Abstract:

A force transducer and circuit are used to detect the edge of a rotating grinding wheel. The force transducer produces an output signal indicative of a force applied thereto. The output signal is filtered by a high pass filter coupled to the output of the transducer. The amplitude of the filtered transducer output signal is compared to a reference value. An output pulse is produced if the amplitude reaches a predetermined level with respect to the reference value. A timer responsive to a first output pulse establishes a fixed interval during which the number of subsequent output pulses is counted. If the number of pulses counted during the fixed interval reaches a predetermined quantity, a control signal indicative of edge contact of the grinding tool with the force transducer is produced.