A professional who tends warping machine that gathers and winds strands of yarn in rope form into ball form preparatory to mercerizing, dyeing, or bleaching. Responsibilities include:

• Pieces up ends from supply package to leader to thread machine.
• Sets yardage counter to record amount of yarn wound and starts machine.
• Inserts and ties lease strings at prescribed intervals.
• Observes operation to detect yarn breaks.
• Locates and ties broken ends.
• Doffs ball warps. May tend machine with singeing attachment to remove lint from yarn.