Apparatus for compensating for the thermal expansion of two relatively movable machine parts
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United States of America Patent
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-
May 23, 1989
Grant Date -
N/A
app pub date -
Aug 4, 1987
filing date -
Aug 13, 1986
priority date (Note) -
Expired
status (Latency Note)
Importance
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.
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