A professional who controls equipment to assemble wooden barrels, performing any combination of following duties. Responsibilities include:

• Positions ends of designated staves in truss hoop to form barrel shell and places shell on conveyor that conveys shell through steam box to make staves pliable.
• Places shell in hoop driver that forces truss hoop onto end of shell opposite bilge to secure staves in shell.
• Positions steamed shell over gas burner to form permanent shape of staves.
• Aligns staves and forces truss rings onto barrel shell, using barrel-assembly machine or vibrator platform, cooper's hammer, and hoop driver.
• Pulls levers to hold shell in croze cutter and to rotate shell against cutterheads that cut croze and trim ends of barrel shell staves.
• Removes end truss hoops to facilitate installation of barrelheads, using truss-pulling machine.
• Positions barrelhead in croze of shell and moves lever to lower cinch ring of machine that forces head into croze; or positions shell and heads in heading machine, hammers heads into place, moves lever to squeeze staves around heads, and place steel hoop into position to secure heads.
• Starts sander and moves levers to push rotating barrel against sanding belt to smooth exteriors of barrel, or sands exterior of barrel, using hand held belt or disk sander.
• Installs permanent hoops, using hoop driver.
• Drills hole in barrel for filling and emptying purposes, using drill press.
• Inspects barrels for defects, such as loose staves, cracks, and defective assembly.
• May be designated according to machine operated as croze cutter; head-up operator; heater operator; hoop-driving-machine operator; leveler ii; sander.
• May be designated: tap-out operator; truss driver; truss puller.