System for compensatively correcting for displacements due to he

Details System for compensatively correcting for displacements due to he System for compensatively correcting for displacements due to he

1987-03-09

1990-05-22

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

356400, 901 47, G01N 2186

Patent

active

049280198

ABSTRACT:
Relative displacement of parts of a machine tool caused by thermal deformation is compensatively corrected for by a correction system comprising a diffused light source mounted near the main spindle of the machine tool for holding a machining tool, a lens mounted apart from the light source on the table which is moveable relative to the main spindle and functions to hold a workpiece, a light spot displacement detector for detecting variation of position of a light source image formed by the lens and generating a corresponding detection signal, and a control means operating to compute, from this signal, any relative displacement of the table and the light source and, on the basis of this relative displacement, to correct the relative position of the table and the main spindle.

REFERENCES:
patent: 4453085 (1984-06-01), Pryor
patent: 4602163 (1986-07-01), Pryor
patent: 4698491 (1987-10-01), Lysen

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