Re: [IAWA Forum] Wood cores

From: Osamu Kobayashi <osamuk@agr.ehime-u.ac.jp>
Subject: Re: [IAWA Forum] Wood cores
Date: Thu, 24 Oct 2002 15:49:37 +0900

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Dear Candace

For stuck borers have a look on this article.

Yamaguchi, D.K. 1991 Mechanical devices for extracting stuck increment
borers., Canadian Journal of Forest Research 21: 712-714

Also, consider using 2-thread borer for hard trees. My memories tell me that
Haglof handles 2-thread borers. Usually borers with less threads are easier
to extract from a tree. This might prevent you from being bored from a borer
that is stuck in a tree.

Cheers
Osamu

On 02.10.23 9:22 PM, "felling@hawaii.edu" <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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> http://www.cof.orst.edu/org/IAWA
> About the IAWA and/or the IAWA Journal:
> http://courses.ncsu.edu/classes/wps202001/IAWA/iawa.htm
> The International Association of Wood Anatomists
> 
> 

-- 
KOBAYASHI, Osamu PhD. (osamuk@agr.ehime-u.ac.jp)
http://village.infoweb.ne.jp/~fwga0159/osa-la-e.htm
http://web.agr.ehime-u.ac.jp/~expfor/index.htm
The University Forest
Faculty of Agriculture, Ehime University
Tarumi 3-5-7, Matsuyama-shi, Ehime 790-8566, JAPAN
Tel & Fax:  +81-89-946-9913

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