Today, I used a working lathe and made screws for my club activity.

This sentence is fine grammatically, but usually I see lathe either by itself: "I used a lathe." or with the type of material it works on: "I used a metalworking lathe."

Metal processing is enjoyable because I like to see the production process that a metalof a cylindrical metal rod changesing into a bi little by little.

I'm not sure what "bi" is supposed to mean in this sentence.

The sharpened surfaces are glitter like a mirror.

The only whatthing I do not like about using a lathe is thate tiny chips of metal arethat tingle inat the end.

I am going to work again tomorrow again.

Today, I used a workingworked on lathe and made screws for my club activity.

Saying "I used to" says that you've done an activity repeatedly in the past that has now come to an end.

Metal processing is enjoyable because I like to see the production process that a metal cylindrical rod changes into a bi(?) little by little.

I kind of did not understand what the "changes into a bi little by little" phrase mean.

The sharpened surfaces are glitter like a mirror.

The only whatthing I do not like about using a lathe is that tiny chips of metal are tingle in the end.

"what I do not like" does not work with "The only ..."