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So here is the doco. Mulga wood is a bone chisel. The strength of mulga is 90-120MPa perpendicular to grain and skull-bone is 140-210MPa. 140 is bigger than 120. Anyway..
Toorale Man - YouTube

In the early days of the colony, they used wooden blades as chisels. These were brought to a fine sharp edge and were able to slice through bones. Not often seen these days, they are surprising and...

My brother owns Telstra ( Nigeria) Inc and is a barrister handling the Will of your relative having your name, who was trampled by elephants at his gold-mine. If you send the MPa number for mulga , ...

It's the mulga you use for your boomerangs. Hardness is part of the reason but density is the go for good products. The perpendicular fail MPa is different again . A good blade 40mmx10mm was...

I'm on the case. Suspect resembles West Australian jarrah , parallel 61Mpa , perpendicular 3.1.
Believed to be associate of mulga . Perp suspected to be 4 and is assisting with the inquiry.

All I can find is that mulga has parallel compression ultimate fail of 40-70 MPa.
Surprisingly , ironwood and blue gum are higher. But what is the perpendicular compression ultimate fail MPa for...

Well if mulga could absorb / reject abuse it would be as hard / tough / brittle as metal . I've pushed a sharp mulga split-end and a chisel into softwood - the mulga cut less and rounded the edge....

Ian
I'm still doing Toorale man. ".. It was originally thought to have sustained metal damage when first uncovered, but the subsequently dating caused re-evaluation. . It is now generally accepted...

yes , all true . But my thing is not about the skill , it's about the theory because there's another problem I'm interested in. So it needs overthinking . A elanjacobs says : "take the impact" ;...

thanks Ian
It's about the angle of the whole tool not the sharpness . It's an obvious skill so probably no-one thinks twice about the steepness of the chisel-handle : it really is "theory" to...

So I've read up about cutting angle , tool angle , clearance angle and compression compared to lift and cut . Got it. Would anyone know about a formula or data on energy for large cutting angle...

Yes it is but these are recent definite opinions from bone workers. Martin Smith is into ancient skeletons and weapon injuries and did tests using arrows on bone. Shaving the jaw bone on Toorale...

So a couple of people gave me consent to publish their opinions:

"Dear John,
With apologies for my slow reply - busy time of year running up to the end of the Spring term.
I have had a good...

There are mulga chisels for sale but strangely that means the handle not the pointy bit . Cambridge Uni has published an Oz article that mulga can cut like steel blades do. This bloke got a headache...

Yes, it seems that a metal blade is the way to go .
Some replies are :
"Was the skeleton a child? I don’t think even a (very sharp) hardwood blade could cut through an adult outer cortex of...

Ian ( and all others)
Thanks for your responses.
Police forensic, surgeons, bone researchers and Japanese swordfighters tell me they don't know. They have no info on wood removing bone. The best...

....!!!
On himself? Woodworkers ?

To put my inquiry another way :
If mulga is sharpened to make a blade 2mm thick at 10mm back into the blade then how strong is the wood? Is it likely to snap when hitting bone?

Janka hardness of buloke is about 1.5 times mulga hardness but some question that. Weight and sharpness of the blade is needed for this hinged avulsion ( wedge of bone attached by a shred ) but...

Hullo
A skeleton dated to about 500 years ago has 2 cuts thought to be sword cuts until the dating made that "impossible". So they say a mulga blade did it. Do you believe that sharpened mulga...

The soil is gravelly trap and the engineer said it is about the most stable base. It almost can be worked by chisel. With f72 mesh, is 75mm concrete sufficient for a car's weight, or is it likely to...