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one of my thinnest preforms.

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iowabow:
So I also made this one and I want you to notice the flake on the tip. I included a close up of the platform. Notice it is  3/32 thick and I built a small platform with that steep angle. I gave it a hit and then I knew this was the ticket. The reason is because now I know more certainly than ever that I should be able to thin very thin preform using this technique. 

iowabow:
That preform broken in half because I hit that third ridge on the right just too high on the platform. But I know that you can get 3 passes from one set up. But I made sure to move the deltas in just a bit. In the past I would reduce them to a single ridge. This now seems to be a bad idea.

nclonghunter:
You are holding it at a 45 towards the ceiling or the floor?
As odd as it sounds when using a billet I tend to hold the preform at a 45 towards the ceiling, however with punch work it is lower. Hitting high and low with a billet is why I am working the indirect percussion now. The accuracy is a lot better.

Thanks for the post and pictures. Really like those wide flake scars.

iowabow:
Kind of like this and tonight when I get home I will make a couple platforms to explain that better as well. Man if the platform is not just so it won't work. The margin is narrow but not impossible for the average knapper. But be warned you a riding on the edge of stepville.

iowabow:
If you do step it you know you are close

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