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knapping precut slabs

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Chippintuff:
I have not chipped much novaculite, but a lot of what I have chipped was prone to step. If you're not having that. Problem on other stone, it may be a problem of needing to make tougher platforms. Also, after running long flakes across a flat surface, the bulb concavities at the start of each flake may need a little cleaning up before running the next series.

WA

Dalton Knapper:
Dh - are you sure it is heat treated? Glossy or at least some gloss? You may have to zig-zag the edge before you attempt to run flakes across. Good luck.

mullet:
After each pass grind the edge off so it is slightly rounded. Then grind some new platforms. I also use a rubber pad glued on a piece of wood with different size slots cut in it.

vinemaplebows:

--- Quote from: mullet on November 24, 2014, 12:37:37 pm ---After each pass grind the edge off so it is slightly rounded. Then grind some new platforms. I also use a rubber pad glued on a piece of wood with different size slots cut in it.

--- End quote ---

I agree with Mullet. Try to get the video "lap knapping"  by Craig Ratzit (sp) it will answer most of your questions when it comes to slabs.

mullet:
That's where I got the idea from, Brian. I watched Craig use it at the Dade City Knap-In a few years ago.

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