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Fig. 2. Barrel loading capacity chart in lb for typical parts. 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 holes or recesses. A variety of substrates are suitable for mechanical plating and galvanizing and include low carbon steel, high carbon heat-treated spring steel, leaded steel, case-hardened and carbonitrided steel, malleable iron, and stainless steel. Powder metallurgy parts can be plated by this process without prior sealing of the sur- face. Because mechanical plating solutions are usually chemically consumed, lit- tle excess is available to get trapped in the pores of the substrate. In addition, the initial copper strike will seal such pores and the metal powder that follows will fill and bridge them. The process can also plate onto brass, copper, lead, and cer- tain other substrates. EQUIPMENT Mechanical plating equipment is a specially designed plating and material han- 354