Rockwell hardness test
Scale for measuring material hardness
Episodes
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#5101: Drill Bits and Concrete: What Actually WorkedA 12V drill, a $20 bit set, and a reinforced safe room wall — what actually happened, and why the first bit failed. -
#5050: Engraving Hardened Steel: Carbide Grades & Hardness TestsHow to measure material hardness without destroying your workpiece, and pick the right carbide grade for stainless steel engraving.