To provide an automatic grinder independent of a level of skill of an operator for a height of comb-shaped lip of a labyrinth packing, the grinder being capable of executing corrective machining regardless of a curvature, a size, and/or a condition of the labyrinth packing.SOLUTION: A grinder comprises a stage 14 movable in x- and y-axis directions, a gripping mechanism 24 to hold a labyrinth packing 60 on the stage 14, grinding means 34 to grind comb-shaped lips 62 of the labyrinth packing 60, a z axis actuator 26 to move the grinding means 34 in a z-axis direction, measuring means 38 to measure three points of Z axis coordinates along the x-axis of the labyrinth packing 60, and control means 42 to acquire a curvature radius of the labyrinth packing 60 on the basis of the measurements by the measuring means 38, generate machining data for grinding the upper end of the lip 62 by the grinding means 34 on the basis of the acquired curvature radius, and output control signals to the stage 14 and the z axis actuator 26.SELECTED DRAWING: Figure 1
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