Metal Finishing Guide Book

2011-2012 Surface Finishing Guidebook

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Page 587 of 707

Jessup barrel Cu. Ft. Barrel fill @ 33%, cubic feet Anode-to- work spacing inches* Table 1. Jessup barrel vs. hex barrel design. * Constant 5.5 Average 6.25 Difference In. Difference % .75 12% 4.0 Hex barrel Cu. Ft. 3.32 Difference Cu. Ft. .68 Difference % 17% Except in cases where simple fixed process cycles run, or where machine man- agement and data recording is unnecessary, PC/HMI operation of finishing systems is standard for all new machines. Retrofits are easily accomplished. They often include machine position sensors, rinse water control systems, and pro- grammable chemical feed pumps. Machine monitoring, management, load-by- load data recording and paperless quality management features offer quick return of customer investment. 2) Programmable, recipe-based individual cell rectification enables precise, repeatable plating thickness for every load regardless of part count for rack plating, or weight for barrel plating operations (Figure 2). This PC-driven feature derives and calculates surface area data from a customer-supplied lookup table on a discreet part number basis. Operator entered load data assures precise amp square foot (ASF) delivery for rack plating systems. Barrel weight is verified directly by load cells by either addition or subtraction methods. This assures correct ASF delivery for barrel plating systems. Installation of individual rectifiers integrated with a PC/HMI recipe-driven controls make over- and under-plating a distant memory. 3) Programmable chemistry replenishment reduces operator workload and improves quality by reducing fluctuations in process baths. This recipe-driven feature assures precise additions based on PC-tracked production information. The goal is to dampen the bath concentration saw-tooth effect common with manual addition practices. Precision control is available only by an integrated PC/HMI. The control screen allows external adjustment of replenishment volumes at any time during machine operation (Figure 3). Installation of PC/HMI-driven chemistry management controls will improve quality and reduce operator addition errors. 4) Programmable load-by-load rinse water replenishment allows optimization of water consumption on an individual part number basis. This feature enables experimentation with the minimum rinse water volume necessary to assure quality processing. The goal is to 586 average of the nearest to the farthest spacing. The hex barrel anode-to-work spacing distance is the

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