[問題] 鑄件上的孔
之前發文字數有點少以至於被刪文 所以在從發ㄧ篇
我想請教的是在工具機鑄件表面上有大大小小的孔(不是螺栓孔)還有內部肋上的孔
那些孔有沒有他的專有名詞?
在網路上找不太到有關那些孔的相關資料
以前聽說過那些孔是為了減輕重量而挖的
不過到底是以甚麼為根據來決定挖孔的地方與大小
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