The Sigma purlin addon is an additional set of tooling that can be ordered with a Hayes purlin line. Fabricated with the same welded steel design and D2 through hardened tooling rolls as all Hayes machines the Sigma tooling section is positioned at the exit end of the machine. The entire tooling section is mounted on a sliding raft assembly that can be moved out of position in exchange for a conveyor section to allow other profiles to bypass the sigma section when required. The raft positioning is controlled via an electric gearmotor, and screw drive controlled by the operator, the forming stations are driven by a dedicated electric gearmotor.