Author Topic: pressure flaking patterns?  (Read 11314 times)

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Offline iowabow

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Re: pressure flaking patterns?
« Reply #45 on: April 16, 2012, 10:05:58 pm »
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Offline Tower

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Re: pressure flaking patterns?
« Reply #46 on: April 16, 2012, 10:08:20 pm »
That's a nice one. Perfect for hog huntin.
He who sacrifices freedom for a security deserves neither one.  Benjamin Franklin!

Offline gstoneberg

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Re: pressure flaking patterns?
« Reply #47 on: April 16, 2012, 10:10:07 pm »
Yea, that's lovely.  Be awhile before I get to that point.  Lookin good John!

George
St Paul, TX

Offline Bevan R.

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Re: pressure flaking patterns?
« Reply #48 on: April 16, 2012, 10:51:59 pm »
Looks like a beauty to me. Is it obsidian or dactite?
Bowmakers are a little bent, but knappers are just plain flaky.

Offline iowabow

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Re: pressure flaking patterns?
« Reply #49 on: April 16, 2012, 11:13:11 pm »

Looks like a beauty to me. Is it obsidian or dactite?
Thanks all for following all these posts. 

Bevan it is obsidian and I reached to pick up a blade to abrade with and it cut right into me without any pressure.   It is just evil stuff.   
(:::.) The ABO path is a new frontier to the past!

Offline Bevan R.

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Re: pressure flaking patterns?
« Reply #50 on: April 16, 2012, 11:16:18 pm »
I know what you mean.
I have a piece of it from the point I did today under my thumbnail. Not sure how to get it out without involving several changes of pants :o
Bowmakers are a little bent, but knappers are just plain flaky.

Stringman

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Re: pressure flaking patterns?
« Reply #51 on: April 17, 2012, 01:34:32 pm »
John, that last looks good. Nice work on a pretty piece of obsid!

Bevan- it will feel better when it quits hurtin...   ::)  >:D

Offline maddog314

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Re: pressure flaking patterns?
« Reply #52 on: April 17, 2012, 04:11:02 pm »
OHOHOH I WANT ONE MOMMY!!!!!!!!!!! That is SWEET! I love the way obs scars.. Great job.
Micah

Offline iowabow

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Re: pressure flaking patterns?
« Reply #53 on: April 20, 2012, 03:23:46 am »

I think I found some amazing rock and so I am up late baby sitting the kiln.  Crazy right guys but I really would like to make some knife size poinst.  Anyway I was passing the time working on the thinning thing with a stone I was bifacing out.   I was thinking about what I have been working on and a passage from John Whittaker's book on flint knapping (all beginning knappers should have a copy) and in the part about patterns he talked about tip placement.  His book entered my thinking on the 2nd pass on side A (side A is always the first side) and I started spacing the flakes closer together.   This accomplished two things it all but eliminated the deltas and lowered the platform.  This also decreased the bulb on the flake and left the surface convex.  When I removed flakes on side B I placed the pressure flaker on the ridge (which I had abraded) and was able to get a nice pattern started.  The edge was exactly what I had envisioned starting off with this post.  OK I would have liked it to be more skilled but that is coming now with all my practice.   I finilly did it and it feels real good.  So look closely at the edge it is real sharp and the flake scars do not have the deltas pushed back on the edge.  It is mostly clean all the way to the edge for the most part. 






« Last Edit: April 20, 2012, 03:38:55 am by iowabow »
(:::.) The ABO path is a new frontier to the past!

Offline gstoneberg

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Re: pressure flaking patterns?
« Reply #54 on: April 20, 2012, 09:32:26 am »
Wow, that looks perfect to me.

George
St Paul, TX

Offline iowabow

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Re: pressure flaking patterns?
« Reply #55 on: April 20, 2012, 10:18:58 am »
Wow, that looks perfect to me.

George
Yes the process is solid now! It took a lot of practice but it all came together.   It is hard to believe that only a couple of mm make all the difference in the world. 
So I will practice this and the next post should be a real nice point. 
If anyone wants to try this remember the following;

Prefect preform~no steps no shallow spots and must be always lens shaped before you start flake pattern.
Decide on a flake pattern that is close and leaves no deltas and is convex. 
The final pass is not for fixing problems at all. 

TAKE YOUR TIME you cant be in a hurry because it take about 2 hours to come close to doing it right. 

On a scale of 1to10 with 10 being the most skilled I believe right now I am about a 2
Here are the following reasons
1. Platforms have low spots that make the pattern thin in areas
2. High spots in the center of the preform causes you to place the ishi high on platform so many flakes had to be thick to over shoot the center.  This causes deeper flake scars and make side B platform to low. 
3.  I have not worked out how the up and down placement effects flake detachment.  My guess is that the pattern will be somewhat nicer because less force equals more control.  Also the flake can bend with the contour of the stone. 



« Last Edit: April 20, 2012, 10:28:42 am by iowabow »
(:::.) The ABO path is a new frontier to the past!