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電工在搞電氣安裝或水電安裝時,總是要用到手電鉆來鉆孔,手電鉆是電工常用的工具之一,有些手電鉆用的時間長了以后,電機上的炭刷就會磨損嚴重,當炭刷磨損嚴重時炭刷與轉子之間會嚴重打火,需要更換新的炭刷.如果一時沒有合適的炭刷,而又急需使用手電鉆時,可以用2號廢舊電池的炭刷按原炭刷尺寸磨好代用,等有合適的炭刷時再替換.
