Quote:
Originally Posted by Serum
that would depend on the grade of steel that's used for the motorshaft. And the motorshaft would likely get off the magnet if you heat it that far.
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you can start with mild steel, all you are doing is adding carbon to the steel, I didnt see the part of it being the motor shaft, in that case I probubly wouldnt risk it, since the process of hardening could cause warping if you cool it too qiuckly, the metal gets harder the quicker you cool it