Method of and apparatus for determining relative position of a t

Details Method of and apparatus for determining relative position of a t Method of and apparatus for determining relative position of a t

1981-04-14

1982-12-28

Paschall, M. H.

Electric heating

Metal heating

Cutting or disintegrating

219 69W, B23P 108

Patent

active

043663605

ABSTRACT:
A technique for accurately determining the size of a machining gap and a specific resistivity thereof in a machine tool, especially an electroerosion machine tool (e.g. EDM machine), measures the electrical resistance between a tool member and a workpiece in a given relative position to give a first measurement value. The tool member and the workpiece are then relatively displaced by a known distance from the given relative position to establish a shifted relative position and the electrical resistance therebetween is measured to give a second measurement value. The calculation from the first and second measurement values yields one of the given and shifted relative position and the specific resistivity of the gap.

REFERENCES:
patent: 3973104 (1976-08-01), Ullmann et al.
patent: 4236057 (1980-11-01), Inoue

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