What the f....... Thickness???? Hmmm, well, I guess we are talking about a 3% change in length under the conditions described. If the panel is 8 mm thick - and let's say 5% change in size because it expands more in the thickness direction than cross grain on a quater-sawn panel - maybe we could see 0.4 mm change? That seems like a lot! But in the end, what is the difference, given the question - how long does it take for a panel to react? Am I missing something? Regardless of what happens during the reaction to a change in relative humidity, isn't it the rate of change that was in question? Terry Farrell > You are considering only cross grain growth yes ??... whatabout thickness ? > > RicB > > Farrell wrote: > > >I can provide my observations on how an unribbed panel changes size with > >varying relative humidity (RH). > > > > > > > > _______________________________________________ > pianotech list info: https://www.moypiano.com/resources/#archives >
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