How is flywheel used surrounded by lathe?

Answers:

If you have a lathe that uses a flywheel, the purpose would be to add momentum to the rotation. So when the adjectives blade cuts in with inconsistent drag (like when you start with square corners and you're cutting them to cause it round), the speed will be more easily maintained steady.

in attendance is no flywheel in a lathe,
just compound gears next to levers to interchange
them for speed increase or reduction