Casting a Bronze Flat Axe — The First Metal Cutting Tool

The flat axe was the first metal tool to surpass its stone predecessor in every way — sharper, more durable, and resharpened by simple hammering rather than knapping a new edge. Cast from bronze (roughly 90% copper, 10% tin), these axes appeared across Europe, the Near East, and East Asia from around 3300 BCE.

This blueprint uses an open-face stone mould — the simplest casting method. Molten bronze is poured into a carved soapstone cavity and allowed to cool. The resulting casting has one flat face (from the mould floor) and one slightly convex face (from the open top where the metal surface tensions). After demoulding, the axe is cold-hammered to harden the cutting edge, ground to shape, and hafted onto a wooden handle with rawhide lashing.

A single flat axe required the combined knowledge of mining, smelting, alloying, crucible-making, mould-carving, and woodworking — making it one of the most knowledge-intensive objects of its era.