It is at right angles. The grain on the rib runs along the length of the rib and the soundboard grain runs about 90 degrees to that. I can't imagine that even stepping on the soundboard in that spot (much less lying on it) while cutting the notches would stress the rib enough to crack it given the proximity to the belly rail and the fact that the panel shows no sign of excessive deflection. I would guess that the rib was cracked when it was installed (perhaps dropped in the factory?) and the crack opened up over time with some downbearing load and humidity swings. David Love www.davidlovepianos.com -----Original Message----- From: caut-bounces at ptg.org [mailto:caut-bounces at ptg.org] On Behalf Of prescottpiano at juno.com Sent: Wednesday, December 08, 2010 11:35 AM To: caut at ptg.org Subject: Re: [CAUT] strange rib damage I may be confused, but is the grain orientation of the rib wrong in Kent's picture? I would think the grain should be at a right angle to the soundboard. Larry Messerly ---------- Original Message ---------- From: Jim Busby <jim_busby at byu.edu> To: "caut at ptg.org" <caut at ptg.org> Subject: Re: [CAUT] strange rib damage Date: Wed, 8 Dec 2010 10:32:33 -0700 Hi Conrad, I ditto that experience. An upright. Clearly a footprint on the other side. I'm sure a small crack, too much pressure of some kind, etc. could have been the issue in another piano, but that looks just like what we had in not one, but two places. Jim ________________________________________ From: caut-bounces at ptg.org [caut-bounces at ptg.org] On Behalf Of Conrad Hoffsommer [choffsommer at hotmail.com] Sent: Wednesday, December 08, 2010 5:25 AM To: caut Subject: Re: [CAUT] strange rib damage The only time I've seen something similar, there was a footprint on the soundboard... ;-{ (not mine) Conrad Hoffsommer ________________________________ From: PAULREVENKOJONES at aol.com Date: Wed, 8 Dec 2010 00:25:22 -0500 To: caut at ptg.org Subject: Re: [CAUT] strange rib damage Two instances of the same very rare phenomenon? An undetected crack when built? Seems unlikely to me. Perhaps a misplaced clamp during construction? As well as asking a lot of sugar pine? Seems more likely to me. Mysteries. God I love this profession. Paul In a message dated 12/7/2010 7:12:06 P.M. Central Standard Time, rnossaman at cox.net writes: I've seen it, usually accompanied by 3� treble bearing. I figured it was an undetected crack when the board was built, compounded by asking a lot structurally of sugar pine ribs. ____________________________________________________________ How to Fall Asleep? Cambridge Researchers have developed an all natural sleep aid just for you. http://thirdpartyoffers.juno.com/TGL3141/4cffde1dc14d15fd99dst04vuc
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