A professional who changes knives used in chipper machines that reduce pulpwood to chips. Respnsibilities include:

• Dismantles machine, using hooks and chain hoist.
• Inspects blades, and removes defective blades with handtools.
• Removes chips collected between blade and disk wheel, using airhose.
• Bolts new blades in machine, using fixed gauge to obtain accurate setting.
• Files knife blades.