A cutting device for a mill plate including a cutting tool supported for movement in a Y-direction and cutting in a Z-direction, and a conveyor for conveying a mill plate in the X-direction. A measuring device is movable in the X-direction along one side of a mill plate supported on the conveyor to map the X-axis and Y-axis positions of the mill plate one side. Positioning guides adjacent one side of the conveyor are adjusted in the Y-direction to follow the mapped Y-axis position of the mill plate one side at the X-axis position of the mill plate one side aligned with the positioning guides as the mill plate is conveyed in the X-direction. A clamp on the side opposite the mill plate one side is adapted to push the mill plate opposite side in the Y-direction to maintain the mill plate one side in engagement with the positioning guides.