5841| 3
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135頂角自定心高鈷高速鋼鉆頭對付不銹鋼等韌性很足的材料打孔攻絲運 |
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點評
其實小鉆頭進給阻力小,所以不磨短橫刃也沒啥關系,不過話說回來,磨刀不費砍柴工,磨橫刃是科學的,現在那些微小的線路板合金鉆嘴都是磨得,做事有時就是要一勞永逸
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