Soundboard recrowning and rib re-arching.

[gordon stelter]

--- Farrell <mfarrel2 at tampabay.rr.com> wrote:

> I'm not sure I would be comfortable doing all that,
> but that might not 
> matter!

Well, D.L. has claimed to have done it to many, many
pianos with measurable success.  The only part that
worries me is the 10% humidity, which I fear could
crack joints. I'd better double check on that. The
bolts impinging on the ribs have cauls under them , of
course, to keep from ripping through the rib.
> 
>> > ribs might be scraped clean of finish. Then, ina
> > "flexed out" state, painted with super-thin CA
> glue,
> > whicj should impregnate the wood, making ita  lot
> > stiffer.
> 
> Did the ribs loose some stiffness somewhere? How
> much did/do they need?

Well, I'm guessing that he cwassuggesting that for the
board to go flat, the ribs must suffer some
longitudinal compression, as well. If they were
"stretched" into a bow again, then impregnated with
some C.A. I would think that thios oud aid the crown,
greatly. I have an old Knabe upright I think I'll try
this on. I'll get it toa  stable, low RH< measure the
crown, bow out ribs and impregnate, and measure again,
all de-strung, and get back to y'all. But it may bea
while, so if anine wishes to "beat me to it", i invite
them to try.
   thanks!
     G
> 
> >    If any of y'all want to try this before I get a
> > shot at it, and report back, please do!
> 
> I would, but I gotta sharpen my chisels and plane
> blades.  ;-)
> 
> Terry Farrell
> 
> >     Thanks,
> >     Thump
> 
> 
> 


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