As for my lathe I was speaking of the back gears that control the worm that moves the carriage, I have to move belts to change chuck speed, same as on the bike rear drive the faster I spin the chuck the less TQ I have at the tool, the slower I spin the chuck the more TQ I have, the chuck represents the rear wheel so I make the drive pulley bigger in relation to the pulley on the shaft the chuck is mounted to the faster it goes but less TQ I have at the chuck.
