Wire before drawplates. Early wire was not drawn at all. It was cut as a narrow strip from hammered sheet and rolled between two flat surfaces, or made by twisting a strip into a spiral and then rolling it smooth — the technique that leaves the faint diagonal seam you can see on much ancient wire under magnification. It worked, but the diameter wandered and the length was limited by the sheet.

Why drawn wire mattered. A drawplate gives you metres of stock at one exact gauge. That is the difference between making one ornament and making chain — and chain, mail, filigree, granulation and wound settings all need many identical elements. When a technique in the historical record suddenly starts appearing in quantity, uniform wire is often the reason.

The physics. Pulling metal through a converging die makes it flow plastically: the cross-section reduces and the length increases, conserving volume. The metal work-hardens as its crystal grains deform and tangle, which is why it gets stiffer and stronger with each pass, and why annealing — heating to let the grains recover — is what lets you keep going. Draw too far without annealing and the wire fails suddenly, usually right at the plate.

Why the plate is harder than the wire. The whole method depends on the die staying its own shape while the wire changes shape. That means the plate must be substantially harder than the material drawn through it — which is why drawplates are hardened steel, and why the holes are polished. A scored hole prints its score into every centimetre of wire that follows.

Half-hard on purpose. The choice to skip the last anneal is not laziness. Work-hardened wire resists deformation in a finished piece, so a clasp stays sprung and a coil stays coiled. Jewellers speak of dead soft, half-hard and hard wire, and pick deliberately — the same alloy behaves like a different material depending on how it was finished.

Jewelry Tools

Blueprints (2)

Pitch Bowl for Repoussé

Drawing Wire with a Drawplate