Electrical guide for tight tolerance machining

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