How do you change gears on a metal lathe?

To change gears on a metal lathe, first, ensure the machine is powered off and the spindle has come to a complete stop. Locate the gear mechanism, which typically involves a series of levers or knobs that control the gear train. Adjust these controls according to the desired speed or thread pitch, referring to the lathe's manual for specific settings. Finally, check that all gears are properly engaged before turning the machine back on.