Rab:
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I just plated a part of 60 square inches
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WHOA! You hadn't mentioned how big the parts were before.
How many square inches of anode are you using? You need total anode surface area
at least double the size of the parts.
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it recomends .002 amps per square inch, so 1.2 amps for my 60" part, using the calculations that you have stated ( and I dont doubt your wisdom in the slightest ) I should have been using up to 8.4 amps for this part , if I have the new kit mabey this is why I am having no fizzing !
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Yes, that's nowhere near enough current, and would account for no fizzing.
With the original formula, 60" will need at
least 4 amps, but will plate best between 4.5-6 amps.
With the new formula, it will need 8.4 amps.
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Why the huge difference in power recommendations.
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In a nutshell, the original recommendation of .025 amp/sq-in was not based on electrical measurements, but simple math.
The original power-brick supplied in the kit was RATED at 300 ma., and sufficient for 12 sq-in. Doing the math, you get 25 mA/sq-in.
However, IN ACTUAL USE, while plating 12 sq-in, that power brick truly produced 800 ma! 800 ÷ 12 = 67 ma/sq-in. Not coincidentally, 67 ma/sq-in is the
minimum current recommended for the electrolyte.
Sean