Originally Posted by
BC17A
Sorry for the late reply, I missed this one.
When I size pennies I don't anneal them at all until they're at the finished thickness. Though I only thin down about .002" at a time. I suppose to speed up the process you could squeeze them more per roll but that would probably require a few annealing steps in between to keep them from cracking. I tested a few newer pennies with high zinc and things got ugly before I had any success. Old pennies are still abundant. I have a SiL that has probably more than ten thousand she'd collected over the decades. She said next time I visit she'd be glad so swap some out for bills.