Electrical guide for tight tolerance machining

Details Electrical guide for tight tolerance machining Electrical guide for tight tolerance machining

1988-08-31

1991-06-18

Schmidt, Frederick R.

Metal working

Method of mechanical manufacture

Electrical device making

29705, 29707, 51165R, 51281R, G11B 5127, B23Q 1700, B23Q 1500

Patent

active

050239910

ABSTRACT:
Method and apparatus for determining present machining height during machining of a workpiece includes an analog resistive sensor, a discrete resistive sensor and a resistive integrity sensor. Analog sensor preferably has a plurality of resistive elements. Discrete sensor includes contact break points on resistive legs, each leg having a different resistive value to create a step-wise incremental change in resistance of discrete sensor as contacts are lapped away. Integrity sensor has resistive value in fixed relation to resistive value of discrete sensor such that ratio is indicative of integrity before machining. Invention enables use of electronic lapping guide with electrically conductive lap without shorting out. Discrete sensor value used to determine location of rear plane of analog sensor and analog sensor value used to confirm identity of break point as part of method for determining current lapping height. Formulae disclosed enable computation of lapping height from measured resistances based on a known height of the analog sensor prior to lapping.

REFERENCES:
patent: 3821815 (1974-06-01), Abbott et al.
patent: 4014141 (1977-03-01), Riddle et al.
patent: 4477968 (1984-10-01), Kracke et al.
patent: 4559743 (1985-12-01), Kracke et al.
patent: 4675986 (1987-06-01), Yen
patent: 4689877 (1987-09-01), Church

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