Method and apparatus for error compensation

Details Method and apparatus for error compensation Method and apparatus for error compensation

1987-09-23

1989-02-28

McQuade, John

Gear cutting, milling, or planing

Milling

Machine frame

408 13, B23B 3908

Patent

active

048080489

ABSTRACT:
A method and apparatus for compensating displacements of a machine point due to temperature changes, such as the temperature-related displacement of a work spindle axis of a milling machine relative to a machine reference point. The measurement values of the intended positioning of the work spindle axis are determined by means of a position measuring device which includes at least one first sensing device for sensing a measuring scale. A second sensing device connected to a housing of the work spindle through a push rod of a material having a small coefficient of expansion is used to directly determine the temperature-related displacement with respect to direction and magnitude. The determined value is computed into the measurement value of the intended position by means of an analyzing unit. The result is a compensation of the temperature-related displacement of the work spindle axis.

REFERENCES:
patent: 3045510 (1962-07-01), Brainard
patent: 3602090 (1971-08-01), Whetham
patent: 3735157 (1973-05-01), Whetham
patent: 4100837 (1978-07-01), Kohler
patent: 4354404 (1982-10-01), Ramusino
patent: 4440530 (1984-04-01), Yamakage
patent: 4581808 (1986-04-01), Lawson et al.
patent: 4728232 (1988-03-01), Babel

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