Humidistat for Wood conditioning box

[Farrell]

This is a multi-part message in MIME format.

---------------------- multipart/alternative attachment
Well, I don't have a gauge nearly as cool as Ron's (and indeed, his is =
totally cool), but I have a system that works very well. I simply =
measure the soundboard width cross grain. Wood in my shop is at about 9% =
MC. I find that a three-foot-wide panel will shrink about 1.5 to 2 =
millimeters by the time it dries down to 6% MC. I put a small tack at =
one side of the panel and mark the other edge. It's pretty easy to =
measure to within 1/10 of a millimeter. It really only takes two or =
three days to dry a panel down. You can test this pretty easy also by =
simply drying the panel down to what should be 5.5% MC while monitoring =
width. After it stabilizes after a couple days, let the hot box go up to =
conditions that should produce 6% MC - and watch the panel width =
increase a couple tenths of a millimeter.

If the panel is already ribbed, I guess you could then measure changes =
in crown. With a feeler gauge, you could measure changes in crown pretty =
accurately also. And do the same thing to test it - target the box =
environment for 5.5% MC, monitoring crown - after it stabilizes, let the =
box come up to 6% MC conditions and watch the crown increase a little =
bit.

Terry Farrell
  ----- Original Message -----=20
  From: David Love=20
  To: 'Pianotech List'=20
  Sent: Monday, January 23, 2006 8:44 PM
  Subject: RE: Humidistat for Wood conditioning box


  How long do you usually give for a ribbed soundboard panel to equalize =
(assuming you haven't built one of Ron N's cool gauges)?



  David Love
  davidlovepianos@comcast.net=20

  -----Original Message-----
  From: pianotech-bounces@ptg.org [mailto:pianotech-bounces@ptg.org] On =
Behalf Of Farrell
  Sent: Monday, January 23, 2006 4:50 PM
  To: Pianotech List
  Subject: Re: Humidistat for Wood conditioning box



  Yes, I monitor temperature and RH and use a chart to determine EMC. I =
use a good hygrometer that has an accuracy within 2% RH - mine actually =
tested out within 1/2% RH. =
http://www.pacer-ind.com/hygrometers/dh50.html



  Terry Farrell

    ----- Original Message -----=20



    Not sure I understand how a thermostat would give you a sense of RH. =
 You can have 80 degrees with 90% humidity or 80 degrees with 15% =
humidity.  If you are talking about using a thermostat combined with a =
hygrometer and checking a chart with the equivalent EMC, you are still =
dependent on the accuracy of your hygrometer which are only accurate to =
+/- 5% anyway, no?



    David Love
    davidlovepianos@comcast.net=20

    -----Original Message-----

    I find a thermostat to work just as well and easy as a fancy =
humidistat. I use a thermostat designed for a reptile terrarium. Just =
use a temp/RH chart along with it and it's a cinch. Cost is about $30.



    Terry Farrell

      ----- Original Message -----=20



      I found this humidistat that I would use for a wood conditioning =
box that seems to be fairly good but expensive ($290).  Anyone have any =
experience with it or can you suggest one that works as well for less =
$$$.  It's the RHC that I'm looking at-scroll down to the second unit. =20



      http://www.greenair.com/humidistat.htm





      David Love

      davidlovepianos@comcast.net=20



---------------------- multipart/alternative attachment
An HTML attachment was scrubbed...
URL: https://www.moypiano.com/ptg/pianotech.php/attachments/b7/fb/52/9a/attachment.htm

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