PURPOSE: To quickly and correctly repair the tooth flank of a ring type gear damaged with use by fixing part of the circumference of the ring type gear to a cutting device to give cutting work to a few gears.
CONSTITUTION: A cutting device 7 is conformed to the whole distortion of a girth gear 4 and corrects local distortion, and is made to be movable in X, Y, and Z directions and rotatable in a plain orthogonal to a tooth surface for performing working while conforming to the present condition of the girth gear 4 as a whole. Part of the circumference of the gear 4 is fixed to this cutting device 7 to cutting-work a few tooth surfaces by the cutting blade 10 of the cutting device 7. Moreover many tooth surfaces are cutting-worked by moving the fixed portion of the girth gear 4 to the cutting device 7 via a gear cover 9 by the rotation of a pinion 8.
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