Metal Finishing Guide Book


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Page 456 of 903

Fig. 2. Barrel loading capacity chart in lb for typical parts. APPLICABLE PARTS Various part types for which coating opportunities were limited to electroplating, hot-dip galvanizing, painting, or organic finishing are now successfully being mechanically plated or galvanized. Parts now universally accepted for consideration include regular and self-tapping screws, bolts (including A 325), nuts, washers, and stampings; nails; chain and wire forms of all types; pole line and tower hardware for telecommunications; electrical connectors; and automotive, aircraft, and marine fasteners. The suitability of parts considered for mechanical plating or galvanizing is determined by its size, shape, and base metal. Part types that would not withstand the tumbling action of the process are usually not suitable. Parts heavier than 1 to 2 kg (2.2-4.4 lb) or longer than about 300 mm (12 in.) are not normally coated in this manner. Parts that have deep recesses or blind holes may make the part unsuitable, because to obtain a satisfactory deposit, solution and glass beads must flow freely and have sufficient impact energy in all areas of the part surface. This must happen without glass beads permanently lodging in 449

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