Internal grinder
Number of patents in Portfolio can not be more than 2000
United States of America Patent
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-
Sep 18, 1990
Grant Date -
N/A
app pub date -
Mar 14, 1989
filing date -
Mar 18, 1988
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An internal grinding apparatus having a grinding wheel attached to a spindle rotor radially and axially supported by electromagnetic bearings. Currents applied to the electromagnetic bearings are continuously controlled by a controlling system including a central processing unit during grinding work in order to adjust the longitudinal axis of the spindle rotor. The longitudinal axis of the spindle rotor is inclined and/or shifted at predetermined locations of the grinding wheel in a bore of a workpiece, thereby eliminating tapering of the long bore, and improving the cylindricality and straightness in grinding work.
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