meaning of headstock
1. A part (usually separate from the bed or frame) for supporting some of the principal working parts of a machine
2. 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.
3. The part of a planing machine that supports the cutter, etc.
4. 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