Centrifugal adjusting bore grinder

The utility model relates to a centrifugal adjustable hole grinding machine. The end of an output rotating shaft of a motor is fixed with a shaft sleeve; the side wall of the shaft sleeve is provided with a plurality of through grooves; a mandrel which is concentric with the shaft sleeve is fixed in the shaft sleeve; a plurality of grinding and positioning pieces are matched with and installed on the cone faces of both ends of the mandrel; the position of each of the grinding and positioning piece respectively corresponds to the through groove; at least an abrasive wheel sheet and a positioning piece are respectively fixed on the grinding and positioning pieces; a pushing-tight device is arranged on each of the grinding and positioning piece. The utility model makes the grinding and positioning pieces automatically be centrifugal to be correctly positioned; grinding is uniform; the machining quality of grinding holes are ensured; the technical requirements, such as the physical dimension of an inner hole, the smoothness of the inner hole, etc. are respectively superior to manual and mechanic reamings; the phenomena of slotting and napping can not occur; the utility model is mainly applied to the repairs of inner holes with various positions and more than two work pieces cooperated with pin holes; materials, such as metals, ceram, glass, etc. which have various high hardness and are difficult to process can also be carried out for grinding.