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The Polishing Process In the polishing department, coarse grit grinding on bumpers is brought to a satin smooth finish by polishing with 180, 240 and 360 grit abrasive wheels and belts long, flat areas on bumpers are polished using semi-automatic reciprocating machines while the ends are polished by hand-held working of the bumper against abrasive wheel or belt. Small openings and contoured areas on bumpers are worked on with hand-held polishing tools resulting in a bumper that has been prepared on all visible external surfaces. Repeated inspection during polishing insures that the metal is smooth and free of pits, lines, grinder marks or other imperfections before the bumper is passed in to the plating department. |