Numerically controlled machine tool

Details Numerically controlled machine tool Numerically controlled machine tool

1982-06-01

1985-04-30

Vlachos, Leonidas

Turning

Process of turning

82 2B, 318 39, 318571, B23B 100, B23B 2506

Patent

active

045136467

ABSTRACT:
A numerically controlled machine tool comprises a tool movable into engagement with a workpiece, means for generating a first signal being a measure of the distance between the tool and a datum surface provided on a relatively fixed part of the machine, a first closed loop system adapted to move the tool toward the workpiece and having the first signal as feedback, means for generating a second signal being a measure of the distance between the tool and the workpiece, a second closed loop system (33) having the second signal as feedback, and means responsive to the second-mentioned distance attaining a threshold value, while being moved under the control of the first system, for changing control of the tool movement from the first to the second system.

REFERENCES:
patent: 3641849 (1972-02-01), Kinney
patent: 3727493 (1973-04-01), Lahm
patent: 3975667 (1976-08-01), Bory et al.
patent: 4000448 (1976-12-01), Shum et al.

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