1) Tends machine that vulcanizes synthetic composition outsoles to leather or fabric uppers: Positions upper on heated metal last.
2) Seats precut outsole in cavity of mold and pulls lever to invert last.
3) Starts machine that lowers lasted upper into die cavity and vulcanizes outsole to upper.
4) Vulcanizes breaks and holes in casings and treads of motor vehicle tires: Cuts and trims broken sections of tire with knife.
5) Scrapes and cleans area, using electrically or air-rotated wire brush.
6) Coats break on inside of tire with rubber cement.
7) Cuts raw and corded rubber patches and rolls them into rupture, using hand roller, to ensure adhesion.
8) Covers rupture on outside of tire with tread rubber and works rubber into hole with hand roller.
9) Trims patch, using knife.
10) Places tire in tire mold of vulcanizing machine which has been heated to specified temperature.
11) Adjusts air or steam bag inside tire, inflating it to exert pressure on tire in mold.
12) Clamps tire in mold and allows it to remain until rubber is vulcanized and patch fused with surrounding rubber.
13) May inspect and rebuff tire.
NVTI,SHS,JHS,AND OTHER PROFESSIONAL CERTIFICATE