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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.
高级
2-3 hours (casting and finishing, assumes prepared mould and molten bronze)
说明
1
1
Prepare the mould
Prepare the mould
Take a stone mould with a flat axe cavity already carved (see the Stone Mould blueprint). Coat the cavity with a thin layer of soot by holding it face-down over a smoky fire, or rub with tallow. Pre-heat the mould near the fire for 30 minutes until hot to the touch. A cold mould causes premature solidification and incomplete filling.
此步骤所需材料：
Animal Fat (Tallow)30 克2
2
Charge the crucible with bronze
Charge the crucible with bronze
Place copper and tin into a clay crucible at a ratio of approximately 9 parts copper to 1 part tin by weight. For a flat axe weighing about 300 g, use 270 g copper and 30 g tin, plus 50 g extra to account for spillage and the pour channel. Place the charged crucible into the charcoal fire and work the bellows to raise the temperature above 1,050 °C.
此步骤所需材料：
Copper Sheet (0.5-1mm)270 克3
3
Melt and alloy the bronze
Melt and alloy the bronze
The copper melts first at around 1,084 °C. Once liquid, add the tin — it dissolves rapidly into the copper, lowering the melting point to around 950 °C. Stir with a dry stick to distribute the tin evenly. The melt is ready when it glows a uniform bright orange-yellow and flows freely when the crucible is tilted. Skim off any floating slag with a flat stone chip.
此步骤所需材料：
Charcoal3 公斤4
4
Pour the bronze into the mould
Pour the bronze into the mould
Using long-handled tongs, lift the crucible from the fire and pour the molten bronze into the mould in one smooth, continuous motion. Fill from the pour channel and continue until metal rises slightly above the cavity rim. Do not pause mid-pour — interruptions create cold shuts (visible seam lines where two flows met and failed to fuse). Work quickly; bronze begins solidifying within seconds of leaving the fire.
所需工具：
Crucible Tongs (long-handled)5
5
Cool and demould
Cool and demould
Allow the casting to cool in the mould for 10-15 minutes. The bronze solidifies from the outside in — the surface loses its red glow first while the core remains liquid longer. Do not quench in water at this stage. Once cooled to a dull grey, turn the mould over and tap the back firmly — the casting should release. If stuck, wedge a flat piece of bone or antler between the casting edge and the mould wall.
6
6
Remove the pour channel and flash
Remove the pour channel and flash
The casting emerges with a sprue (the solidified metal in the pour channel) attached to one end. Score the sprue at the junction with the axe body using a sharp flint flake, then snap it off by bending. File or grind away any flash — thin fins of metal that seeped into cracks between mould halves or along the cavity edges.
所需工具：
Hammerstone7
7
Cold-hammer the cutting edge
Cold-hammer the cutting edge
Place the axe blade-edge-down on a flat stone anvil. Strike the edge with a smooth hammerstone using controlled, overlapping blows. This cold-works the bronze — compressing the crystal structure and increasing hardness from about 80 HV (as-cast) to 200+ HV. Work both faces evenly. Hammer from the body toward the edge, never the reverse, to avoid rolling the edge over. The edge should fan out to about 1 mm thickness.
所需工具：
Flat Stone Slab8
8
Grind and sharpen
Grind and sharpen
Grind the axe faces on a sandstone slab with water to remove surface irregularities and casting marks. Finish the cutting edge on a fine-grained whetstone, maintaining a consistent bevel angle of about 25-30 degrees. The final edge should shave wood cleanly.
此步骤所需材料：
Sandstone (Abrasive)1 个
Whetstone1 个9
9
Shape the haft
Shape the haft
Select a straight-grained hardwood branch about 40 cm long and 4 cm in diameter — ash or oak are ideal. Carve a flat shelf at one end by splitting the wood partway and removing one side, creating an L-shaped seat where the axe head rests. The flat back of the axe sits flush against this shelf. Some flat axes were also set into a carved slot in a knee-shaped handle cut from a branch junction.
10
10
Bind the axe head to the haft
Bind the axe head to the haft
Lay the axe on the shelf with the cutting edge projecting beyond the handle. Wrap wet rawhide strips tightly around the handle and over the axe in a figure-eight pattern, pulling as tight as possible. As the rawhide dries it shrinks by about 10%, clamping the axe immovably. For extra security, drill a small hole through the axe butt and pass a rawhide thong through it and around the handle.
此步骤所需材料：
Rawhide Strips2 m材料
6- 占位符
- 占位符
- 占位符
- 占位符
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