[CAUT] Bushing cloth thickness

[Fred Sturm]

On 7/31/07 2:27 PM, "A440A at aol.com" <A440A at aol.com> wrote:
> 
> When bushing a Steinway front mortise, I use the cloth (.53-.055") and a caul
> that is .162" in the front rail.
> 
Interesting. Obviously a very different approach from mine. You are putting
two pieces of .053² cloth into the hole with a .162² caul, while I am
putting two pieces of .038² cloth into the same hole (well, we don¹t know
that, since the wood could be compressed or have some splinters gone, but
let¹s assume not) with a .149² caul. I don¹t compress the felt much at all.
I would say you are compressing the felt a lot, and expecting it to stay
compressed quite a bit.
> 
> I hope the felt quality of the Pianotek material is good, since I just
> rebushed 7 Yamaha pianos that were totally worn out after 6 years in the
> practise rooms.  
> 
Pianotek sells Hainesworth cloth, same felt that Steinway and Renner use to
the best of my knowledge (both did last I asked). If there is any other
quality bushing felt out there available to us techs, I¹d like to know about
it. Longevity is mostly a function of lubrication and polish, in my
experience. I apply powdered teflon liberally to one side of the cloth, and
polish and lube pins very well, replacing any iffy ones. Results seem very
good. Applying Prolube to bushings of new pianos of any brand seems to help
longevity a lot. Raw, untreated bushings don¹t last well, and they abrade
the pins.

Regards,
Fred Sturm
University of New Mexico


-------------- next part --------------
An HTML attachment was scrubbed...
URL: https://www.moypiano.com/ptg/caut.php/attachments/20070731/ca704d1e/attachment.html