The final step is to heat treat. I take the camshaft and wrap it up in wire as shown below, I then make a slurry of isopropyl alcohol and boric acid. I heat the camshaft and dip it in the slurry, reheating and dipping a few times until I have a nice coating of boric acid on the part. Then I heat it to bright red hot and quench in oil.
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Below is the part after quench, it is free of scale. I boil up some water and rinse off the boric acid.
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Finally I do a file scratch test. The file glides off the new part without making a mark, but when I do the same test on the old one, the file cuts easily. This notch is indicated by the red circle below on the old part.
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Well that's it. I'll call 'er done.
As Joe Pie says, "I'm out."