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Old December 15, 2012, 10:18 PM   #23
Senior Member
Join Date: March 11, 2010
Location: South East Pa.
Posts: 3,364
I am with Defariswheel (Somewhat). Somebody does not know what they are talking about. You can not use a "C" scale to check hardness on something cased only .015 to .020 thick. The same with spot annealing. All you need to do is slightly spot the hole with a carbide drill or small carbide endmill so you break through the cased area wide enough to make sure the tap clears it. Talk about re-inventing the wheel.
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