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Before drilling with a twist drill on the machining center, we use the drill bit shown in Figure 1 ...
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The reporter learned from the Zhenjiang Science and Technology Bureau on the 18th that the world& ...
1.1.2 Turning cast iron parts When processing hard cast iron, as long as the hardness reaches the ...
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First, control the precision of the finishing dimensions on the ordinary lathe. In the machining, i ...
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