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棒材上打一個(gè)貫穿孔,請(qǐng)教 |
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點(diǎn)評(píng)
不是搞鉆頭的,不清楚,但7000mm的鉆頭剛度如何保證?不跑偏?如果鉆頭材料是超合金的話也許有這可能·
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點(diǎn)評(píng)
大蝦能否說(shuō)細(xì)點(diǎn) 什么是三輥鉆孔?
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