Apparatus for compensating for the thermal displacement of the m

Details Apparatus for compensating for the thermal displacement of the m Apparatus for compensating for the thermal displacement of the m

1989-05-16

1990-04-24

Briggs, William

Gear cutting, milling, or planing

Milling

Cutter spindle or spindle support

318634, 36447435, 408 11, 408 13, B23C 106, B23B 3908, G05B 1918

Patent

active

049195751

ABSTRACT:
A thermal displacement compensating apparatus capable of compensating for the thermal displacement of the main spindle of a machine tool is disclosed. A feed back scale and a measuring head are provided in order to detect the actual position of the front end portion of the spindle head. Furthermore, a distance sensor is provided for detecting the thermal extension of the main spindle with respect to the spindle head. The output signal from the distance sensor is used for modifying the present position detected by the measuring head or modifying a commanded target position. With this arrangement, a tool attached to the front end portion of the main spindle is moved to the commanded position regardless of the thermal displacement of the spindle head and the main spindle. Another type of compensation apparatus is also disclosed, wherein the measuring head is mounted on a mounting rod, and the mounting rod is automatically moved so as to maintain the distance between the measuring head and the front end surface of the main spindle at a constant distance. With this arrangement, actual position of the front end surface of the main spindle can directly be detected regardless of the thermal displacement of the spindle head and the main spindle.

REFERENCES:
patent: 3045510 (1962-07-01), Brainard
patent: 3221605 (1965-12-01), Hemmerle et al.
patent: 4382215 (1983-05-01), Barlow et al.
patent: 4471443 (1984-09-01), Kinoshita et al.
patent: 4553858 (1985-08-01), Tlaker
patent: 4808048 (1989-02-01), Miller

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