A professional who tends machine that presses notched ends of boards together to form lock-corner box frame. Responsibilities include:

• Turns handwheels to adjust side and end pressure bars according to frame dimension.
• Positions boards on table and starts machine.
• Presses pedal to activate pressure bars that force notched ends of boards together, forming lock-corner joints.
• May dip ends of boards in glue before joining.
• May melt glue in glue pot.