Profile: Starley Mfg., Inc. manufactures precision rotary welding positioners, which are designed to increase weld productivity and improve weld quality. Our Roto-Star welding positioner is used for grinding, assembly work, painting, brazing and production work. We design Roto-Star I with jaw self-centering chuck, which feature jaw chuck with reversible jaws, spindle opening, swing in horizontal position and spindle speed.