A professional who controls guns (pressure cylinders) to expand or puff whole grain to produce breakfast cereal. Respnsibilities include:

• Presses button to admit grain and water to electric- or gas-heated cylinder.
• Clamps lid in place and starts cylinder rotating.
• Turns valves and moves controls to regulate air pressure and temperature in cylinder to obtain product having puffed kernels of specified size, color, and uniformity.
• Removes lid after specified time, causing grain to expand as it escapes from cylinder.
• Examines and feels product to determine need for adjustments in process conditions.