Lignum Vitae IS Ironwood.  Beech is very soft if you are thinking pressure and 
wear resistance.

I really don't know what other woods to try.  Oak was popular, and willow, and 
elm, for other projects.  But for bearings?  I don't know what was used on 
windmills, grainmills, or water wheels.  Might be good to find out (though I 
wouldn't be surprised it was and oversized oak bearing packed with oil-soaked 
tow.  Fine for larger things, not so good for an instrument like ours.

Chris

*********** REPLY SEPARATOR  ***********

On 2/8/2008 at 5:00 PM Leonard Williams wrote:

>How about ironwood or beech?  The latter I'm sure was available in
>medieval Europe.
>
>Regards,
>Leonard Williams
>           _
>         [: :]
>        / |  | \
>       |  |  |  |
>       (_==_)
>           !~¿
>
>
>
>On 2/8/08 8:03 AM, "Chris Nogy" <[EMAIL PROTECTED]> wrote:
>
>> That is the wood.
>> 
>> Hard, dense, grows moderately slowly.  Pretty blue flowers on the tree,
>that
>> turn into a drop shaped orange seedpods.
>> 
>> Takes a while to cure.  It is a hard wood to work, doesn't turn well
>except
>> with the sharpest of tools.  Can be mechanically polished to a high gloss
>> (only scraping and rubbing, no chemicals or wax).  Doesn't absorb
>anything
>> very well.  A block in almost any shape will sink immediately if placed
>in
>> water.
>> 
>> Has a hardness of more than 4000 on the Janka scale (oak is about 1800).
>> 
>> It is not the friendliest wood in the world to hand tools.  But it has
>> tremendous stability and resistance to deformind under pressure.  That
>is why
>> it made a good hammer head.  That and it is almost as heavy as the steel
>in a
>> regular head.
>> 
>> Chris



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