Rab:
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my part is not that big, is it ?
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It is too big for the original small kit. Your part size will be limited by either available power, or anode size.
Your math is correct. Now, how big are the anodes?
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If I am correct then I now do have a power supply problem as my bench top supply only puts out 3.12A max.
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That's enough for about 45 sq-in MAXIMUM using the old formula. You will be on the ragged edge of unacceptable plate though.
It's enough for 22-25 sq-in using the new formula.
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I tried the piece this evening at my max 3.12A and saw a little fizzing for the first time, it turned out with shiney nice plate on a few areas but still dark on others
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Now you are getting somewhere. Fizzing is good. A 60" part should produce quite a bit of fizzing. The patchy plate you describe does sound like your anodes are too small for the part.
I suggest you try a small part, well within the limits of your power supply and/or anode size, then you'll know what a good plate looks like.
Have you determined yet if you have the original or new formula? Did your kit come with a small AC power adapter? If it did, it's most likely the early formula. The new kit does not include a power adapter.
However, since you are getting kit in the UK, I don't know what the differences might be.
Sean