He means crack..I believe as in pull apart. Tension cracks. If you dont dry out a panel enough for the relevant climate is will crack during dry transients. 6 % is pushing it for much of the world. 7 % would pretty much guarantee it me thinks. But then thats not such a concern in a RC&S board outside of visuals. Cheers RicB Hello Ron: What do you mean by the term "checking"? David Love davidlovepianos at comcast.net www.davidlovepianos.com Original message: ...This is not however, a criticism of the practice of drying solid RC&S panels down to 6 - 7%, since it would be quite dangerous to build any solid paneled board without some pre-drying, to avoid the likelihood of checking during dry transients. But when a laminated panel is used, the problem of checking is/will be totally avoided, and the maker is free to bring the panel and ribs together for gluing under normal room conditions... Ron O.
This PTG archive page provided courtesy of Moy Piano Service, LLC