Abstract: A rare earth magnet block is cutoff machined into pieces by rotating cutoff abrasive blades. Improvements are made by setting the blades on one side of the magnet block, rotating the blades, starting machining operation to form cutting grooves in the magnet block from one side, interrupting the machining operation, moving the blades to the other side of the magnet block, and restarting the machining operation to form cutting grooves in the magnet block from the other side, until the cutting grooves formed from the one and other sides merge with each other.

Abstract: A fastening jig for securing a magnet block (M) when the magnet block is cutoff machined into pieces is provided, the jig comprising a lower clamp (31) on which the magnet block is rested, an upper clamp (32) disposed on the magnet block, and a press unit (33) for pressing the clamps to apply a pressing force to the magnet block. A portion of the lower clamp (31) which is disposed adjacent to the magnet block is provided with a generally horizontal channel (311) to define a resilient cantilever (312), whereby the magnet block is held between the clamps by the repulsion force of the cantilever (312).

Abstract: A fastening jig for securing a magnet block (M) when the magnet block is cutoff machined into pieces is provided, the jig comprising a lower clamp (31) on which the magnet block is rested, an upper clamp (32) disposed on the magnet block, and a press unit (33) for pressing the clamps to apply a pressing force to the magnet block. A portion of the lower clamp (31) which is disposed adjacent to the magnet block is provided with a generally horizontal channel (311) to define a resilient cantilever (312), whereby the magnet block is held between the clamps by the repulsion force of the cantilever (312).

Abstract: A rare earth magnet block is cutoff machined into pieces by rotating cutoff abrasive blades. Improvements are made by setting the blades on one side of the magnet block, rotating the blades, starting machining operation to form cutting grooves in the magnet block from one side, interrupting the machining operation, moving the blades to the other side of the magnet block, and restarting the machining operation to form cutting grooves in the magnet block from the other side, until the cutting grooves formed from the one and other sides merge with each other.