Wow, that's a scary thought. As a former Steinway piano owner (as in non-technical new piano purchaser - i.e., consumer) I feel very free to criticize Steinway in any way I feel justified. I must say though that I would find it hard to imagine that they would rib a panel that had a moisture content greater than 9% or so. That would be utterly amazing. But hey, I wasn't there that day....... Terry Farrell On Dec 7, 2010, at 9:27 AM, Mike Spalding wrote: > Here's one possible imagined explanation: The panel that went into > that compression-crowned board was not fully cured, or not > completely dried down prior to ribbing. Didn't have enough > compression to crush wood cells during the wet season, and shrank as > it dried and cured to produce negative crown instead of cracks. > Commonly seen in "flat-top" guitars when the maker doesn't pay > attention to shop humidity during the build. > > Mike > > On 12/7/2010 7:53 AM, Terry Farrell wrote: >> Reminds me of my first adventure into piano technology (before I >> got into the business). My brand new S&S 1098 with a full quarter- >> inch of reverse crown - stretch a string across the back of the >> panel parallel to ribs, let string touch panel in center and >> observe both ends a quarter inch off the panel. I wish I remember >> whether I had taken any string bearing measurements - however I >> seriously doubt it - would have been interesting though. Dog-gone >> hard to imagine exactly what might have caused such a condition. >> >> Terry Farrell >> >>> I have a 1990 Baldwin 6000 (52” upright) with an inverted >>> soundboard. The piano was evidently in a very damp environment at >>> one time, since there were several loose glue joints, including >>> the bass bridge to apron and some plywood delaminating in the >>> bottom board . The inversion is severe enough that the ribs near >>> the center of the board are pushing against a back post. The tone >>> is even but weak. Is there any way to flip the soundboard back to >>> its original position without destroying it? Can I just remove >>> some wood from the back post to give the rib clearance and expect >>> that to enlarge the tone? Bearing can be adjusted because of the >>> Accu-hitch pins. Thanks for any suggestions or prior experiences. >>> >>> Don Hubbs >> >
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