Brake rotor machining - GIF

Brake rotor machining.

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Previously:

Brake rotor lathe - GIF
Casting and machining brake rotors - GIF
Indexing plate from brake disc rotor - video
Removing a stuck brake rotor - GIF

Is that a magnet to catch all the cast iron dust? I've turned down a bunch of rotors on my lathe and I hate it. Might as well dump out the crud from the bottom of my vacuum cleaner right onto my lathe. Cast iron is the worst.