Main Discussion Area > Flintknapping
How do you handle big bumps and triangular shapes?
magick.crow:
Thanks for the video hints! I have watched some of Paleomanjim's stuff but not that one. I think it was his bopper video that lead to mine. (BTW the copper head is coming off, is this common?).
So I just made a new rock porn video so that Ghost Knapper can keep helping me. I was shocked that that first big flack worked perfectly. Honestly, I did not even see that point as a platform!
https://youtu.be/AcZiABWWeb4
Ghost Knapper:
Can you post a picture of your tool/tools?
Ghost Knapper:
So here is what I would do again with a smallish bopper.
Trim the edge to remove the red area to set up a platform.
Grind the platform.
Remove the flake outlined in blue.
If the strike angle is correct it should remove enough material to remove the "turtleback" shape and look like the "after" below.
magick.crow:
--- Quote from: Ghost Knapper on August 16, 2015, 09:30:04 pm ---So here is what I would do again with a smallish bopper.
Trim the edge to remove the red area to set up a platform.
Grind the platform.
Remove the flake outlined in blue.
--- End quote ---
How big is smallish?
--- Quote from: Ghost Knapper on August 16, 2015, 09:30:04 pm ---If the strike angle is correct it should remove enough material to remove the "turtleback" shape and look like the "after" below.
--- End quote ---
What is the correct angle and why?
Thanks!
Douglas E Knapp
Ghost Knapper:
Smallish is about this big (holds out fingers). ;)
The one I would probably use based on how the material looks has a head on it that is a 7/8 copper cap. I like to swing alittle faster with a lighter billet vs using a heavier billet. Now if the material is stubborn I would use a heavier billet.
The proper strike angle is a little more vague. If you have books or watch videos there are great illustrations on how the angle effects the outcome. If you strike to straight in it may hinge out or step fracture. Too vertical to the platform and the flake will fall short or may travel a nice distance but it wont remove much material. It will basically skim the surface of the piece.
Can you post a video or picture with your tools, I noticed in a previous post about the head coming off.
Also there is more than one way to skin a cat, so using antler billets, hammer stones, billiard balls, 30-06 etc. will also work but platform prep, strike angle and other factors may/will be different.
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