| 摘要 |
PROBLEM TO BE SOLVED: To improve the machining accuracy of a grinding device by suppressing the influence of load variation in grinding. SOLUTION: The contact length Li of a grindstone 12 is calculated to a work piece Wa in every unit rotation angle of a spindle based on the cutting amountΔH of the grindstone 12. The distance ri is also calculated between the rotational center O of the piece Wa and a grinding point Qi of the grindstone 12 set against the piece Wa based on every unit rotation angle of the spindle. The revolution of a spindle motor is controlled every unit rotation angle of the spindle, so that the rotational speed of the spindle varies in response to the product value of the calculated length Li and distance ri.
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