Soundboard Evaluation

[Delwin D Fandrich]

This is a multi-part message in MIME format.

---------------------- multipart/alternative attachment

  ----- Original Message -----=20
  From: Richard Brekne=20
  To: pianotech@ptg.org=20
  Sent: June 17, 2001 1:20 PM
  Subject: Re: Soundboard Evaluation


   =20
  Delwin D Fandrich wrote:=20

      Does this mean that the a compression soundboard assembly can hold =
crown as  long as RH is held at high enough levels to sustain internal =
compression ? Or do you mean to say that the assembly fail =
anyways...perhaps more slowly.?
    No. Go to R. Bruce Hoadly's 'Understanding Wood' and study the =
effect of creep and compression-set. Wood fibers that are under =
compression--regardless of the degree of compression--will continue to =
go through compression-set. This takes place faster when the compression =
levels are higher and more slowly when the compression levels are lower. =

    Well then what exactly do you mean by=20

    "This is climate dependent to the degree that during dry periods =
moisture will be drawn from the wood fibers and the panel's internal =
compression will decrease. During humid  periods the wood fibers will =
absorb moisture, try to swell, and the panel's internal compression will =
increase."=20

    ?
-------------------------------------------------------------------------=
---


Just what I said. During periods of high humidity internal compression =
will be greater than during periods of low humidity. But nothing lasts =
forever. It will fail anyway. But not necessarily slowly. When internal =
compression levels are high, compression-set is taking place faster than =
it does when compression levels are low.

Del

---------------------- multipart/alternative attachment
An HTML attachment was scrubbed...
URL: https://www.moypiano.com/ptg/pianotech.php/attachments/77/da/ed/1b/attachment.htm

---------------------- multipart/alternative attachment--