Answer :
Final answer:
The headstock is the correct answer. It houses the lathe spindle and contains the mechanism for speed control.
Explanation:
The unit of a lathe which houses the lathe spindle and control levers for speed selection is called the headstock. The headstock is an essential part of the lathe machine, it is usually located at the left end of the bed, and it serves as a housing for the drive gears and the main spindle. In contrast, the tailstock is situated at the opposite end and serves to support the other end of the work being processed. The feed box is part of the mechanism that controls the movement of the carriage along the ways, and the carriage itself moves to carry out the cutting operations, holding the cutting tool and providing it with the correct feed and depth of cut.
