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Originally Posted by FinishingTalkdotcom
If you have calculated your milliamps per part, I assume you figured it by milliamps per square inch. Calculate your total square inches of all parts combined, then multiply by your milliamps per square inch. This will be the total miliamps you will need to process.
Depending on the type of current supply you are using, you may be able to set it at a certain voltage and allow the amps to adjust themselves. If you have calculted the milliamps for a certain part, see how many volts are required to get this milliamp reading. Then, when plating the batch of parts, adjust the current supply to that same voltage and the milliamps should adjust themselves. Hope this helps.
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I appreciate the reply..
Yes, I have calculated the surface area of each piece and the milliamps required for that one piece and, of those I have multiple pieces, the milliamps required for the entire lot..
My Power Supply is an older analog 12v25a unit (like the units Caswell is selling--in fact, this unit might be a Caswell offering from years ago).. the "Volts" are only "adjustable" by moving the positive lead to a different "lug" on the unit (the lugs are 5v-7v, 8v-10v and 10v-12v). I have fairly infinitely adjustable amps (and milliamps, I've fitted an in-line milliammeter).. In short, I can "Set the Amps and the Volts will follow".
I'm clear on plating a "batch" of twenty or so of the same size pieces, my query is more about a "mixed lot" of pieces where each would require a different amount of amps/milliamps.. If plated together, what is the "allowable" difference, between the pieces, either in surface area or amps required, to be plated together?? And, we are not talking about pieces that are "close in size", but those that are noticeably different.. i.e. a 3/16" OD washer and a 1/2" OD washer or a 3/8" tool-size nut and a 9/16" tool-size nut.
I would hate to mess-up the plating and have to repeat.. these fifty year old washers, etc. cannot stand much abrasive or acidic cleaning and the bolts with the proper Headstamps cannot be replaced..