| 摘要 |
PROBLEM TO BE SOLVED: To precisely correct a balance of a rotary shaft by improving correcting workability, and shortening correcting time. SOLUTION: A rotary shaft 1 is rested, and resting time bearing rigidity ksl under supply pressure P1 to a radial static pressure bearing 12 and resting time bearing rigidity ks2 under supply pressure P2 are measured, and then, the rotary shaft 1 is rotated, and a swing ed1 of the rotary shaft 1 under the supply pressure P1 and a swing ed2 of the rotary shaft 1 under the supply pressure P2 are measured. Next, centrifugal force F is calculated by using the resting time bearing rigidity ks1 and ks2, the swing ed1 and the swing ed2 on the basis of F=[ed1×ed2×(ks2-ks1)/(ed1 ed2)], and mass (m) of a screw (w) installed in a screw hole 20a arranged on the circumference of a radius (r) of the rotary shaft 1 is determined from a radius (r), angular velocitytyω, centrifugal force F and F=mrω<2> , and, and an intermediate position of (+θ) and (-θ) of respective eccentric angles respectively measured by normally rotating and reversely rotating the rotary shaft 1, is judged as the eccentric direction.
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