Method and apparatus for measuring machine cutting tool position

Gear cutting – milling – or planing – Milling – With limit means to aid in positioning of cutter bit or work

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33557, 33560, B01G 703

Patent

active

046995510

ABSTRACT:
An apparatus and method are provided for on-line measurement of a lathe cing tool position using a measuring head with a rotatable square plate engaged with three cylindrical plungers and a positioning mechanism for pivoting the measuring head. The positioning mechanism includes a movable member mounted on a base on the lathe headstock and a rotating unit for rotating the movable member about an axis. A stop member is provided to stop the movable member at a locating position. The measuring head includes a square plate supported inside a housing and rotatable about a y-axis therein. The plungers extend into the housing to contact the plate near its corners. In response to a force applied by a cutting tool mounted in a turret, the plungers move respectively in +x, -x, -z directions relative to the housing to cause the square plate to rotate correspondingly. A transducer detects the rotation of the square plate and provides an output signal which is calibrated to yield an indication of the absolute displacement of the plunger and hence the position of the cutting tool relative to a machine datum position.

REFERENCES:
patent: 3990153 (1976-11-01), Calame
patent: 4136458 (1979-01-01), Bell et al.
patent: 4208157 (1980-06-01), Guarino et al.
patent: 4443946 (1984-04-01), McMurtry

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