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Steve, I'm not testing using stainless. First batch I used mild steel, 2nd batch I'm using high carbon. I just can't see where it would make that much difference between hi or low carbon, or stainless or not. We need one of those metal heads to come and tell us if adhesive properties are different between the steels. Now if it was Ti, copper, or other totally different metal, I'd have to wonder about the test.
Are those pieces that failed at the very end of the piece of metal? Could the vibrations be a lot more violent at end of the rod than just a few inches in?
The more I think about this, the more I think the metal surface preparation is causing the bulk of the failures. The majority of failures leaves the metal slick and clean and the residue stuck to the wood. I believe this is all going to come down to how well the metal is prepped for the adhesive. I'm entitled to be wrong. It's probably too early to be guessing like this, at least in my tests.
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