How a sword is made

A bar heated to bright red goes under the hammer. The smith draws the length first, then sets the taper — the blade has to be wider at the guard and narrower at the point, and that difference should come from moving material rather than grinding the excess away.

The fuller is forged with a dedicated tool or milled later. Either way the purpose is the same: take material out of the middle of the section, where it adds little stiffness.

Forging stretches and refines the grain unevenly and leaves stress in the material. A few cycles of heating to the transformation temperature and cooling in air even the structure out.

It is the easiest step to skip and the hardest to recover from. A blade that was not normalised can warp during the quench — when it is already too late.

The blade, heated above its transformation point, goes into the oil. The cooling has to beat the critical rate for that steel, or the structure never becomes martensite.

The result is steel as hard as glass and just as brittle. At this moment a blade can crack from a tap. In selective hardening the spine is coated with clay so it cools more slowly — which gives a hard edge, a springy spine and a visible hardening line.

Controlled reheating releases the stress locked into freshly quenched steel. You lose a few points of hardness and gain resistance to cracking — and only now does the blade start behaving like a sword.

Tempering temperature is the single most important design decision in the process. Lower: a harder edge and more risk of breaking. Higher: a blade that forgives more but dulls sooner.

Edge profiling, flattening the faces, polishing to a chosen grit. Then the hilt: the guard driven tight onto the tang, a grip of wooden core covered in leather, the pommel peened hot or cold.

Finally the scabbard: two thin boards hollowed exactly to the blade's section, glued, covered in leather, finished with a chape. A good one holds the sword by friction at the throat — no catches, no straps.