[kragen]

in theory abrasion with wood or the harder reeds like bamboo seems like it ought to work, but in the archaeological record drilled stone in egypt occurs at the same time as the introduction of copper tools, copper residue is found in many of the drilled holes, and experimental archaeologists who have attempted to drill stone using reeds have failed, but succeeded using copper tubes

surprisingly copper works better than bronze for this

possibly better abrasives like emery (the ancient egyptians used quartz) or something like fire-hardened wood might enable this technique to work without metals, but the ancient egyptians don't seem to have managed it

celt axes are attached to the handle in the opposite way: a slot is cut through the wood handle, and then the stone head is wedged into it, pressing against the ends of the slot (which are end grain) but not touching the sides, because that would split the handle

[WalterBright]

Or cut a pocket in a thicker handle, and just press the stone into the pocket. Add some glue (from sap) to keep it from falling out.

[kragen]

i don't think that will work because of the large moment from ax strikes that aren't perfectly dead-on, but i'm interested to see your results

[WalterBright]

If the pocket is large enough that the center of moment is within the handle, it should work fine.

[nunuvit]

Why wouldn't you finish cutting through to make a slot? The slot has the advantage that using the axe fixes the axe head more firmly into the slot by wedging itself. Even if you wedged the stone in the pocket, the pocket will loosen and the stone will eventually bottom out and won't be wedged anymore.

[WalterBright]

> Why wouldn't you finish cutting through to make a slot?

Because then using the axe would quickly force the stone through the handle, as the only restraining force will be grip from the sides. That force on the sides will also encourage the handle to split. With it in a cup, the force will be on the back.

[nunuvit]

I'm skeptical that plant glue alone would work without additional lashing. Its brittleness is used as an intentional feature in hunting weapons so that the small blades detach and stay lodged in the prey.

[kragen]

i explained upthread how the celt design solves the splitting problem, which you have correctly identified

[kragen]

i don't see why it matters whether the center of moment is within the handle or not; the problem is that the glue has to be able to resist the moment without breaking, but it's much closer to the center of moment than the blade edge

say the blade is 100 mm long and 30 mm thick with a cylindrical back edge; the moment is being applied to the blade edge 85 mm from the center of moment, while the glue is resisting the moment from only 15 mm away, giving a 6.7:1 mechanical advantage, and the force is the full force being applied to the workpiece multiplied by sin θ, where θ is the angle the central axis of the blade makes with the force applied by the workpiece on the blade; typically this will be on the order of 0.1, but in a bad strike perhaps closer to 0.3

i don't know, give it a try?