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Chest Crutch info

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nclonghunter:
Keith, I am glad you posted that on here. Sharing and analyzing the information is exactly what we need. The mention of "Impulse Pressure" is what I would consider to be the dropping or lunging of ones weight onto the the crutch flaker. Also the splitting of a water worn pebble that is placed into the ground and then held by the foot sounds like the cobble of rock being broken by bi-polar methods and the put into the ground to be pressure crutch flaked.
The picture of the knapper who appears to only wear a loincloth ( must be correct when we knap) looks to me like he sitting on the ground like being in a chair. His feet are holding the rock which is likely set into the ground or vise.
I have made a wood block with grooves and notches that I have attempted to flake 2 small bifaces of rhyolite and one of burlington. Rhyolite is hard rock and I have broken them cross ways both times by the applied pressure. No hard blows just pressure. There is a tremendous amount of energy being generated on the small quarter inch antler tine to break that rhyolite that easy. I have also had a couple really nice flakes occur before breaking them. It is the angle and likely the lack of good isolated platforms that has caused the breaks....still learning but I like it.
I also realize I could carry an antler tine and small hammerstone and can generate tremendous pressure by attaching that small tine to a crutch flaker.

Hunts with stone:
Great post Keith. I have watched Jim Winn? Using this on cores. The picture show here looks like there manufacturing blades to. Interesting on the pressure percussion angle of thinking. Don't really understand why using a  stone anvil and not wood there would be less chance of breakage.

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