> Oh, and a practical question about your being in the CC > capital of the universe. When the RH% gets into the low teens, > say 15%, the MC of the soundboards will be 3.5%, at or before > which point a CC board will be flat or have reverse crowned. > Do you have a recognized annual killer octave season or > festival there? > Ron N > Hmmm, well I like festivals, Maestro, but will there be floats... 3.5 to 4% is the emc of choice for my CC friends. I've measured a few of these boards so far and surprisingly they have plenty of crown, probably coming from a combination of the forced crowning from the gobar deck and from the inner rim. Whereas I'm at 5%, rib supported. I have a wood conditioning room that senses RH and opens a relay that I can designate for humidification or dehumidification depending on the season, but in all honesty I let her ride down to 4% this time of year rather than put my board in a "wet box." I also machine a tongue and groove joint in my planks. Del Fandrich referred me to the government's Wood Handbook, which I read in parts. The text states that while this joint is stronger in theory because of the additional glue surface, the effect is often negated by poor machining. I make sure I'm getting a great joint on all five sides and these panels feel stiffer than side grain edge glued panels. Also the tongue and groove allows me to align the planks in such a way that you end up with a thicker panel overall, which I don't think can be refuted. Jude Reveley, RPT Absolute Piano Restoration, LLC Lowell, Massachusetts (978) 323-4545 -------------- next part -------------- An HTML attachment was scrubbed... URL: https://www.moypiano.com/ptg/pianotech.php/attachments/20080123/8f6d1a25/attachment.html
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