[CAUT] Pinning - was; rehearsal room climate swings

[Don]

Hi Jim,

DC systems with bottom covers for grands that have protective covers over
the piano (i.e. performance instruments) do control the moisture levels in
the action cavity. This is quite evident to the point of "destroying" the
hammer line in a well regulated instrument. I have no data yet about
Edward's string covers--but I don't see why they would not cause a similar
effect to a "storage cover".

At 11:05 AM 5/18/2006 -0600, you wrote:
>Hi John, Ron,
>
>How does that (RH swings) affect your center pinning?? When could you
>effectively repin? Pinning during low RH may cause the pins to seize up
>during high RH, and loose pinning might occur with the opposite
>scenario.
>
>I recently repinned an M during 45%RH and when it went down to 20% my
>5-7 grams went to 2-4 grams! (For you "swingers" it went from about 3-5
>swings to 7-10 swings) Not only did this cause rep spring problems but
>the sound of loose hammer pinning is different than good pinning. (Chris
>Robinson/Rick Baldassin did some spectrum studies which verified this.)
>
>This is a concern I've had which I don't remember ever being addressed.
>I've just tried to "get by", but there must be some pinning wisdom out
>there that I'm missing.
>
>Regards,
>Jim Busby 

Regards,
Don Rose, B.Mus., A.M.U.S., A.MUS., R.P.T.
Non calor sed umor est qui nobis incommodat

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