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Here the brake rotor is mounted to the brake lathe and the lathe turns the rotor and shaves a thin layer of metal from the rotor. The result is a smooth and even surface on the rotor like this one. 

Click picture to enlarge.brake lathe











My finger is pointing to the lathe bits that shave the metal from the rotor. You can see metal shavings all around the machine.

Click picture to enlarge. brake work












The metal shavings are collected in a tray located underneath the lathe. 

Click picture to enlarge.