A professional who tends one or more machines that form fiberglass filaments from molten glass and combine filaments into sliver. Respnsibilities include:

• Pulls fiberglass filaments extruded through bushing over sleeve where binding solution is applied and into groove of graphite shoe that binds filaments into single strand of sliver.
• Passes sliver strand through opening in floor to floor winder on floor below who winds sliver onto tubes.
• Patrols and observes bushings to detect defects, such as clogged bushings, beads, bead straps, and defective binder applicators.
• Stops machine and removes beads or bead straps from bushing with wire pick to unclog bushing.
• Notifies yardage-control operator, forming or forming-machine adjuster of defective product or machine operation.
• Turns petcocks to adjust flow of binding fluid to sleeves.
• May turn rheostat to obtain specified temperature in electric furnace where glass is melted.
• May fill furnace hopper with glass marbles and adjust feed mechanisms so that marbles enter furnace at specified rate.
• May be designated according to length and fineness of fibers produced as staple-fiber-machine tender.