Drying pianos prior to CAing block. ( How dry I am ??????? )

[Farrell]

Ric, the short answer is yes, they get tighter and/or looser with humidity
changes. Susan Grahm gives a very good explanation in the Technical Forum of
the October 1988 PTG Journal.

Terry Farrell

> >
> >That was my post about winter/summer. Typical Wisconsin indoor humidities
> >are 70% in summer (or 50% with AC), and 30% in winter.  There's no need
to
> >get it dryer than what you expect it to experience in the future, and if
> >you're concerned about possible damage from drying, then don't even go
that
> >far.  How long?  I don't know.  Do you dry the soundboard on a summer
> >project before repairing cracks and separated ribs?  Do this at the same
> >time.  Maybe you could monitor tuning pin tightness as you go - when
> >they're loose and not getting any looser, you're dry enough.
> >
> >Mike
> >
> >
> >
> Grin... not to beat a drum with a busted thumb... but did we ever decide
> for certain whether pins get tighter or looser in pinblocks when things
> get dry ??  Dont I remember something about an analogy that had a
> balloon with a bunch of circles drawn on it....?... when it expands...
> so do the holes (circles) ....
>
> Cheers
> RicB