[CAUT] Bushing cloth thickness

[Fred Sturm]

Hi Ed,
	Do you use cauls different from  Spurlock's standard sizes? I find  
they require considerably thinner cloth than .053. About humidity  
effects, It seems like the felt is a bigger factor, as high humidity  
yields sluggishness. The idea being that felt will swell, closing the  
gap, while the gap becomes wider due to expansion of the entire key  
(or button). I guess if there is crushed wood, though, that would  
tend to swell in high humidity, also closing the gap (kind of like  
what I imagine happens with pinblocks and loose pins).
Regards,
Fred Sturm
University of New Mexico
fssturm at unm.edu



On Jul 30, 2007, at 4:22 PM, A440A at aol.com wrote:

>
> << Has anybody come up with a "best" thickness for key bushing  
> cloth?  Here's
> the story.  I'm working on a 1920s S&S B that doesn't have the  
> advantage of a
> home with air conditioning.   >>
>
> I haven't found anything more durable or stable than the factory  
> supplied
> cloth for key bushing.  It is .053" thick at approx 50% RH.  I did  
> have some
> Fletcher Newman "box cloth" years ago which was firmer, but I don't  
> know about the
> stability.
>    I also wonder if the wood changes more than the cloth. If so,  
> reducing the
> cloth thickness will make the problem worse...
>
>
>
> Ed Foote RPT
> http://www.uk-piano.org/edfoote/index.html
> www.uk-piano.org/edfoote/well_tempered_piano.html
>  <BR><BR><BR>**************************************<BR> Get a sneak  
> peek of
> the all-new AOL at http://discover.aol.com/memed/aolcom30tour</HTML>

-------------- next part --------------
An HTML attachment was scrubbed...
URL: https://www.moypiano.com/ptg/caut.php/attachments/20070731/09aeccb8/attachment.html