The modern electroplater; a complete book considering fully the elementary principles of electro deposition of metals, their practical application and industrial use . the surface ofan article. Many pleasing effects may be securedon dipped or plated articles if they are lightlytouched against a rotating scratch brush. As hasbeen previously stated, the final metal deposit is muchimproved if the work is removed from the tank,scratch brushed to lay down the grain of the metal,and returned to the solution for the final platingoperation. Surfaces thus treated are exceptionallydurable. Illustration
The modern electroplater; a complete book considering fully the elementary principles of electro deposition of metals, their practical application and industrial use . the surface ofan article. Many pleasing effects may be securedon dipped or plated articles if they are lightlytouched against a rotating scratch brush. As hasbeen previously stated, the final metal deposit is muchimproved if the work is removed from the tank,scratch brushed to lay down the grain of the metal,and returned to the solution for the final platingoperation. Surfaces thus treated are exceptionallydurable. Illustration of a scratch brush is shown inFig. 104. BURNISHING BARREL A power-driven ball-burnishing barrel provides arapid and quite effective method of burnishing smallarticles, either before or after plating. Because smallsteel balls are utilized as burnishing agents, this proc-ess is similar to hand work with the exception that Burnishing 223 several thousand operations are performed at eachrevolution of the barrel. A tumbling barrel cannot be converted for use insteel-ball burnishing. Since this work requires greattool pressure on the part being burnished, the barrel. Fig. 138.—Ball Burnishing Machine(The Baird Machine Co.) must be designed to concentrate the mass of piecesand balls to gain such weight as will produce the nec-essary pressure on the bottom layers. As a protectionagainst excessive bruising, a lining of maple, or otherhard wood, is provided. The burnishing process is quite simple. The pieces 224 The Modern Electroplater to be burnished are placed in the barrel with severalhundred pounds of small steel balls. There is littledanger of using too large a quantity of steel balls;rather the risk lies in the other direction. A goodplan is to allow approximately twice the quantity ofballs as of work, so the articles will not strike against
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectelectro, bookyear1920
