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Slab Knapping

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Ryan Jacob:
So I have 3 spare glass windows to break. They are all about 1/4 inch thick. Is it possible to knap these with only pressure? If not, I can use indirect percussion.

bjrogg:
Yes Ryan it certainly is possible to knap them with pressure only. I usually still use percussion, indirect and pressure but there are methods for pressure only.
Bjrogg

Ryan Jacob:
Bjrogg
What methods are these? He only techniques I know are alternating or zig zag and platform angling. Direct percussion is always a challenge for me using only hammerstones.

Outbackbob48:
Ryan, check out the Blue Hardin thread I used pressure flaking on this window glass. This pc of glass was done with hand pressure flaker and Ishi pressure flaker and a little edge work with horseshoe nail tool. 1/4" glass is to thin for me to percussion.  :-K Bob

Ryan Jacob:
Oubackbob48
Yeah, kinda similar situation now that I think about it. How do you use an ishi stick to build more pressure? Also, is it corrected for me to establish an edge first before considering long flake travel?

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