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where to hit next....?

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1442:
this would be a good strategy to get some mass off and get the margins closer to center and both sides closer together.
The red arrows are glancing type strikes to set up pretty steep platform angles.
The light blue is an isolation flake to help set up the large thinning flakes drawn  in dark blue.
Grind the platforms real heavy, then take off running, jump up in the air as high as you can and come down swinging as hard as you can while supporting the rock on your thigh with some good back edge support which should cause the flake to go all the way across, feather out clean and leave a nice biconvex surface, ready for further thinning.

bjrogg:
So that how it's done. I'll have to give the running jump as high as I can in the air a try.  Very nice knapping lesson 1442
Bjrogg

paulc:
That actually sounds about right 1442!  Swinging for the fences once I switched to copper....I just didn't want to admit that in front of y'all.  Here is what I have ended up with...which I still can't get thinned down....

Paul

1442:
perfect!
Take some bevel flakes (red lines) across the base and make a good bevel about 45 degree angle.
flip it, then take some flakes ( light blue) to isolate a platform in the middle.
grind the tip and grind the platform heavy.
Next step is to support the tip by pressing firmly against an anvil of wood or stone heavy enough to resist movement and cause the channel flake to travel towards that point of contact with the tip.
Then support the base end with one finger and one thumb by squeezing in on the sides near the base.
Get your swing arm and bopper in line with the axis of the point then hit the platform with a good follow through swing like driving a nail.
repeat sequence on other side of point and WAH! LAH! Now you have a fluted point and a new addiction to fluting stuff that can not be cured.
If you have access to or could build a Solberger jig to flute with, that would make the process much easier to control all the variables associated with lining everything up and getting massive pressure applied to the platform and driving the flake down the center of the preform.
Raw Texas rock flutes really well too.

bjrogg:
 (-P another good lesson.
Bjrogg

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