Apparatus for compensating for the thermal expansion of two rela

Details Apparatus for compensating for the thermal expansion of two rela Apparatus for compensating for the thermal expansion of two rela

1987-08-04

1989-05-23

Martin, Jr., William D.

Geometrical instruments

Distance measuring

Error compensation

33707, G01B 1104

Patent

active

048317373

ABSTRACT:
An apparatus for compensating for the thermal expansion of two machine parts which are relatively movable in longitudinal guideways. The apparatus comprises a rule, a support rod longitudinally disposed on the movable machine part for supporting the rule, and an electric scanning head mounted on the stationary machine part. The support rod is made of a material which exhibits negligible thermal expansion in the concerned temperature range. The forward end of the support rod is rigidly secured to the forward end of the movable machine part while the rear end thereof is movably guided on that machine part. The rear end of the rule is fixed to the rear end of the support rod. The scanning head is disposed on the stationary machine part in such a way that any thermal expansion of the stationary machine part cannot affect the location of the scanning head.

REFERENCES:
patent: 2956344 (1960-10-01), Rantsch
patent: 3045510 (1962-07-01), Brainard
patent: 4549354 (1985-10-01), Affa et al.
patent: 4554741 (1985-11-01), Affa
patent: 4603480 (1986-08-01), Sakagami

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