The rotation of the gear machining around its axis (movement III); movement of rock around its axis (motion I), this movement should create cutting motion with speeds 22 - 32mm / s. The motion I and III formed the movement which seemed to roll milling teeth. There is also a movement of rocks along the axis or in the direction of the teeth (if teeth are tilted) to the end of the thickness of teeth grinding pace moving from 0.3 to 3 mm / a ring gear
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