Patent ID: 7530293

Claim:
An index table assembly comprising: a rotary table having a workpiece-receiving surface on one side and a through hole at a rotational center of the rotary table, the through hole having a step portion extending toward the rotational center in the middle of the through hole; a frame which supports the rotary table such that the rotary table can revolve and which is separated from the rotary table in the direction of a rotational axis of the rotary table and including a shaft portion extending through the step portion and a bearing support detachably attached to the shaft portion, the bearing support facing a step surface of the step portion on the same side as the workpiece-receiving surface of the rotary table; and first and second bearings disposed between the rotary table and the frame, the first bearing being positioned between a surface of the rotary table on the side opposite to the workpiece-receiving surface and the frame and the second bearing being positioned between the step surface of the step portion on the same side as the workpiece-receiving surface and the bearing support.