Job Description:

• 1) Operates hydraulic-pressure-auto-frettage machine to improve physical characteristics and to detect physical weakness of machined artillery barrels, following specifications: Plugs muzzle end of barrel, sets barrel in vertical container of frettage machine, and tightens clamps to lock barrel in place.

• 2) Connects water pressure pipes to machine, starts water pumps, and moves controls to apply hydraulic pressure to barrel bore to expand bore to specified diameter.

• 3) Observes pressure indicators and records pressure and time at specified intervals.