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組合機(jī)床鉆床,用的麻花鉆,有導(dǎo)向。 |
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點(diǎn)評(píng)
圖片上清清楚楚畫(huà)出用梯階麻花鉆在工件上制作臺(tái)階孔,前端鉆頭直徑8.5,后面擴(kuò)孔12,你說(shuō)導(dǎo)向部分應(yīng)該是多少?
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