moisture in wool or wood. was Re: When to do it

[Farrell]

Hi Jim. If you are really interested in the felt question (I am) perhaps the
best experiment would be to get a Yamaha or Kawai action center where the
parts that have the felt (flange) are the ABS (or whatever) plastic. Then
one could isolate the felt from the wood, yet keep the felt in its
environment of interest. Dry it for a few days and measure friction.
Increase humidity to very humid conditions while measuring friction in the
action center. One could also try different sources of bushing cloth.

I don't have a Kawai or Yamaha or spare parts, otherwise, of course I would
do this!  ;-)

Terry Farrell
Piano Tuning & Service
Tampa, Florida
mfarrel2@tampabay.rr.com

----- Original Message -----
From: <JIMRPT@AOL.COM>
To: <pianotech@ptg.org>
Sent: Thursday, December 28, 2000 11:15 PM
Subject: Re: moisture in wool or wood. was Re: When to do it


> Wim wrote:
> <<"Is it the wood around the bushings that swell to tighten the center,
> or is it the wool that expands that causes the problem?">>
>
> Wim;
>  In my opinion it is the swelling of the wood which causes the 'tight'
center
> and not any swelling of the felt.
>   In response to my own question I have laid out on a grid..actually the
Ola
> Rotary cutter board :-)... several different thicknesses and widths and
types
> of felt. I measured, cut,  and placed them on exact lines. I have soaked
them
> so that they are moist but not wringing wet. I am going to leave them
there
> overnight to allow any "swelling" to happen and measure them again in the
> morning.....I'll letcha know.
> Jim Bryant (FL)
>