| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a file providing an excellent grinding force which is suitable for grinding a cut surface of a gypsum board for a building or chamfering. <P>SOLUTION: The file includes a body 1, and a plurality of grinding parts 2 and 3 that are attached to the body 1 with backlash, with the grinding parts 2 and 3 being detachable from the body 1. Using the file having this configuration, biting of the grinding parts 2 and 3 into a grinding object surface of a work piece is improved in a grinding step, and the cutting powder stuck to the grinding parts 2 and 3 are easy to fall, resulting in hardly clogging. Further, the worn or damaged grinding parts 2 and 3 can be replaced at a will, for maintaining an excellent grinding force. Further, only worn or damaged grinding parts 2 and 3 can be replaced, or, the one in which progression of wear is relatively fast and the one whose progression of wear is relatively slow can be changed in terms of position at a will, resulting in a lower running cost. <P>COPYRIGHT: (C)2013,JPO&INPIT |
