| 摘要 |
<p>A drum is provided with bearing means for rotatably mounting the drum and has an edge portion which protrudes axially beyond said bearing means and has a free end formed with blades, which constitute a fan adapted to exhaust air from said drum. An annular inserted-tooth cutter having inwardly facing cutting edges and adapted to surround a workpiece to be machined is secured to said free end of said drum and disposed axially outwardly of said fan.</p> |
