| 摘要 |
a magnetic plate (10) having a concaved spherical surface (11) and mounting electromagets (12) on it; a rotating shaft (21) rotated by a drive, a rotating table (20) rotating the magnet plate (10); a grinder assembly including a driving shaft (31) having a fixed angle to the vertical center-line of the spherical surface (11), a grindstone (32) attached to a grindstone support (30). Unit objects for grinding are attached by magnetic attraction to the concaved surface of the magnetic plate in rotation while a separate grinder in rotation moves over the objects to grind their surfaces.
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