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I Forge Iron

Japanese hammer maker at work - video


JHCC

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It provides residual heat to self temper the faces. The eye provides a break so the quench doesn't cross to the other half.  The eye also provides a greater surface area to volume ratio so it quenches faster making the hammer eye harder than the face. It makes a separate tempering cycle mandatory.

It is trickier to get right but with 60 years or so it's not too tough.

Frosty The Lucky. 

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