A professional who tends flame-hardening machine, according to set procedures, to case-harden metal objects. Respnsibilities include:

• Positions and fastens part in fixture, on arbor, or between centers of machine.
• Presses buttons on control panel to light burners that direct flame against part and start automatic feeding or spinning mechanism.
• Observes machine operation and removes finished part.
• May anneal metal cartridge or shell cases and be designated Flame-Annealing-Machine Operator (heat treating).