A professional who tends machine that coats external surface of rotating steel cylinder with concrete mortar to make reinforced concrete pipe. Respnsibilities include:

• Pulls lever to open chucks of machine and signals worker to position cylinder between chucks.
• Closes chucks to secure cylinder for spinning and presses button to rotate cylinder and move it along track at preset rate.
• Moves lever to regulate flow of mortar between revolving brushes or into space between two parallel moving belts which compress mortar and spray or throw mortar onto exterior of rotating cylinder moving along track.
• Stops machine, releases chucks, and signals industrial-truck operator to remove mortar coated cylinder to curing area.