Re: [IAWA Forum] Wood cores

From: "Graeme Berlyn (FO)" <graeme.berlyn@yale.edu>
Subject: Re: [IAWA Forum] Wood cores
Date: Wed, 23 Oct 2002 20:05:27 -0400 (EDT)

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You might consult with Patrick Baker in Hawaii. He is working on Koa and
has had a lot of experience coring tropcial trees in Thailand and Sri
Lanka. His e-mail is patrickbaker@fs.fed.us

Graeme Berlyn

On Wed, 23 Oct 2002 felling@hawaii.edu wrote:

> Aloha everyone,
>
> 	I am investigating the variation in the wood anatomy of
> populations of native Acacias here in Hawaii.  Some of the wood I
> am collecting is very hard and I am having difficulty collecting wood
> cores.  I am using a Haglof increment borer (10" long steel bit, 3-
> thread, 0.2" width, made of case-hardened steel).  I lubricate the bit
> and extractor with surf wax (my Hawaiian adaptation) before boring
> the tree.  Some of the wood is so hard that I have problems getting
> the wood cores.  For example: one tree did not want to let loose of
> the borer.  I tried all sorts of tactics to extract it (ice, WD-40
> lubricant, muscle power) but could not remove it from the tree so I
> broke the borer close to the trunk and kissed that sample goodbye.
> I can only surmise that heat produced during the coring (which was
> not easy!) caused the borer to expand and it got stuck in the tree.
> 	My other common problem is that once I have extracted
> my borer (I now take it out of the tree once it becomes difficult to
> continue to turn the borer), I cannot get the core out of the borer!
> My extractor bends, I have to pound the extractor into the borer,
> and then I have difficulty pulling it out.  Also, some of the wood
> core pops out of the end of the borer and gets stuck there.
> 	Does any one have any suggestions?  This wood is a far
> cry from pine!
> 	Thank you!    Candace Lutzow-Felling
> ****************************
> Candace Lutzow-Felling
> Botany Department and Ecology, Evolution, & Conservation
> Biology Program
> 3190 Maile Way, Room 101
> University of Hawaii, Honolulu 96822
> (808)956-3925
> felling@hawaii.edu
>
>
> ------- End of forwarded message -------
> ****************************
> Candace Felling
> Botany Department
> University of Hawaii
>
>
> ======== Welcome All Anatomists! ==========
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> The International Association of Wood Anatomists
>

Graeme Pierce Berlyn, Ph.D.
Professor of Anatomy and Physiology of Trees
Editor, Journal of Sustainable Forestry
------------------------------------------
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