Abstract: A grinding apparatus comprising: the frame (1) being composed of a pair of supports (3) standing in opposing relation to each other and a support frame (4) which is stretched between and secured to the respective upper end portions of the supports (3); first moving structure (16) provided on the support frame (4) in such a manner that the first moving structure (16) is reciprocatable in one horizontal direction; second moving structure (21) provided on the first moving structure (16) in such a manner that the second moving structure (21) is reciprocatable in a horizontal direction which intersects the direction of movement of the first moving structure (16) at right angles; third moving structure (37) provided on the second moving structure (21) in such a manner that the third moving structure (37) is reciprocatively movable in the vertical direction; and a wheel head (48) provided on the third moving structure (37).

Abstract: The present invention relates to an apparatus for detecting and indicating the balance of a rotating body such as a grinding wheel, a spindle or the like in a machine tool such as a grinding machine. The apparatus comprises an original-point detecting means for detecting an original point on the rotating body, a vibration detecting means for detecting vibration caused by an unbalanced condition of the rotating body, an arithmetic means for computing, from the detected vibration, a deviation of said rotating body in each of a plurality of index positions on the rotating body which are angularly spaced from said original point as a reference, a deviation display means for displaying the maximum value of the deviations, and an unbalanced position indicating means for indicating one of the index positions based on the computed deviations.