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Offline Young Bowyer

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Heat treating?
« on: June 01, 2011, 08:23:01 pm »
Hi, new to flintknapping,  :) so i was wondering what are the advantages of heatreated rock as opposed to nontreated rock, e.g hardness ect.
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Offline Tower

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Re: Heat treating?
« Reply #1 on: June 01, 2011, 08:54:22 pm »
Heat treating some materials weakens the molecular bond & makes the stone easier to knap. But it is not true for all stones & the temp differs from stone to stone.
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Offline Young Bowyer

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Re: Heat treating?
« Reply #2 on: June 01, 2011, 08:57:18 pm »
ah i see thanks  :)
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Offline cowboy

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Re: Heat treating?
« Reply #3 on: June 02, 2011, 12:08:13 pm »
Think of it as making glass from silica sand. Different cherts have differing amount of silica content. Heating just slicks them up. But as Tower said it doesn't work on all rocks..
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Offline JackCrafty

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Re: Heat treating?
« Reply #4 on: June 02, 2011, 01:57:56 pm »
I've been researching heat treating recently and it seems that the heat "lines up" the molecules and allows fractures to travel through the stone more easily.  I don't think it necessarily makes the stone weaker, although it seems that way because it becomes more brittle.  The stone becomes glass-like.

I'm treating ALL my stone that responds to heat.  There are drawbacks, though.  I've got to learn how to knap this "new" material and it's frustrating.  I'm braking a lot more points during the preform stage.  It is, however, easier to notch and easier to work with abo tools like antler and bone flakers.
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Patrick Blank
Midland, Texas
Youtube: JackCrafty, Allergic Hobbit, Patrick Blank

Where's Rock? Public Waterways, Road Cuts, Landscape Supply, Knap-Ins.
How to Cook It?  200° for 24hrs then 275° to 500° for 4hrs (depending on type), Cool for 12hr

JustinNC

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Re: Heat treating?
« Reply #5 on: June 02, 2011, 02:05:31 pm »
Quote from: jackcrafty on June 02, 2011, 01:57:56 pm
I've been researching heat treating recently and it seems that the heat "lines up" the molecules and allows fractures to travel through the stone more easily.  I don't think it necessarily makes the stone weaker, although it seems that way because it becomes more brittle.  The stone becomes glass-like.

I'm treating ALL my stone that responds to heat.  There are drawbacks, though.  I've got to learn how to knap this "new" material and it's frustrating.  I'm braking a lot more points during the preform stage.  It is, however, easier to notch and easier to work with abo tools like antler and bone flakers.

In your opinion, how many artifacts were from heat treated material?
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Offline JackCrafty

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Re: Heat treating?
« Reply #6 on: June 02, 2011, 02:07:23 pm »
From the collections I've seen out here in West Texas, it looks like 90% of the material was heat treated.
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Any critter tastes good with enough butter on it.

Patrick Blank
Midland, Texas
Youtube: JackCrafty, Allergic Hobbit, Patrick Blank

Where's Rock? Public Waterways, Road Cuts, Landscape Supply, Knap-Ins.
How to Cook It?  200° for 24hrs then 275° to 500° for 4hrs (depending on type), Cool for 12hr

JustinNC

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Re: Heat treating?
« Reply #7 on: June 02, 2011, 03:25:42 pm »
Quote from: jackcrafty on June 02, 2011, 02:07:23 pm
From the collections I've seen out here in West Texas, it looks like 90% of the material was heat treated.

Doesnt make me feel as bad about sticking a fire over top of some now :)
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Offline Tower

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Re: Heat treating?
« Reply #8 on: June 02, 2011, 05:52:01 pm »
I read in Europe they have found evidence of heat treating as far back as 15000-20000 ago. I have numerous points from the TX. hill country that have been treated.
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Offline Young Bowyer

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Re: Heat treating?
« Reply #9 on: June 02, 2011, 06:42:42 pm »
How would you heat treat rock? Just throw it in the coals?  :P
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Offline sailordad

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Re: Heat treating?
« Reply #10 on: June 02, 2011, 09:07:28 pm »
Quote from: Young Bowyer on June 02, 2011, 06:42:42 pm
How would you heat treat rock? Just throw it in the coals?  :P

yup go get the prettiest rock you can find,regardless of the cost and give that a try
stand there and watch it untill its finished
and let us know how that went for ya  ;D


actaully i use a electric turkey roaster filled with sand
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Offline Young Bowyer

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Re: Heat treating?
« Reply #11 on: June 02, 2011, 09:11:18 pm »
well what do you do in turkey season?  ;D anyways ill try some obsidian im gonna get from 3 rivers archery
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"A man can be destroyed, but not defeated."
The old man from Ernest Hemingway's The Old Man And The Sea

Offline sailordad

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Re: Heat treating?
« Reply #12 on: June 02, 2011, 09:13:48 pm »
we either cook our birds on the grill or the oven in the kitchen

no need to heat obsidion as mother nature has already done it for you
its volcanic glass  ;)

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i always wanted a harley,untill it became the "thing to ride"
i ride because i love to,not to be part of the crowd

Offline Young Bowyer

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Re: Heat treating?
« Reply #13 on: June 04, 2011, 12:42:18 am »
oh flint or chert, novaculite are what i hsould use?  :)
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"A man can be destroyed, but not defeated."
The old man from Ernest Hemingway's The Old Man And The Sea

JustinNC

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Re: Heat treating?
« Reply #14 on: June 04, 2011, 01:21:42 am »
Quote from: Young Bowyer on June 04, 2011, 12:42:18 am
oh flint or chert, novaculite are what i hsould use?  :)

Novaculite heats at too high a temp for a roaster.
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