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headstock n. 主轴承 主轴承 headstock n 1: the stationary support in a machine or power tool that supports and drives a revolving part (as a chuck or the spindle on a lathe) Headstock \Head"stock`\ (-st[o^]k`), n. (Mach.)
A part (usually separate from the bed or frame) for supporting some of the principal working parts of a machine; as: (a) The part of a lathe that holds the revolving spindle and its attachments; -- also called {poppet head}, the opposite corresponding part being called a tailstock. (b) The part of a planing machine that supports the cutter, etc. [1913 Webster]
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