----- Original Message ----- From: "Richard Brekne" <Richard.Brekne@grieg.uib.no> To: "Pianotech" <pianotech@ptg.org> Sent: October 08, 2003 2:59 PM Subject: Re: RC vs CC again > > > Delwin D Fandrich wrote: > > Hmm... Like I say.. the only thing I dont understand is what happened to that > tensioning (pure stretching) force on the rib.? I mean.. the rib forces the > panel to compress, and the flip side of that coin is that the panel is at least > going to attempt to force the rib to lengthen. The degree it fails in doing so > results in the bending of the rib and the formation of crown.. yes ?? But what > about the degree it succeeds (if any) ? If the rib is at all tensioned in the > sense that it is lengthened in addition to the tensioning that occurs in the > top half from bending... then I dont see how the rib could not be supporting > crown, because if thats the case there is more going on then just the ribs > desire to straighten out.... It also has a desire to not tension any more, > which downbearing on the panel will tend to do. Will the rib stretch? Sure it will. At least the top of it will. To about the same degree as Ron N's aircraft carrier will slow down as it impacts that kamikaze mosquito. Spruce is rather strong in tension, it doesn't like to stretch at all. As well, the bottom will compress a bit and there will be a neutral line somewhere towards the center. The net result is that the thing wants to straighten itself out again. > > > Ponder this stuff as you will, I'll get excited when I see how these > > hypothetical questions actually provide meaningful information that will > > help me design a better sounding soundboard system and a better sounding > > piano. Right now, however, I can't conceive how they will. > > > > Grin.. well hell Del... you misunderstand me here.... I am not trying to tell > you or anyone how soundboards function or not... I am simply asking questions > because there are things I dont understand. That I dont take it for granted > that any other particular person fully understands things either is only a > healthy insurance policy to keep me on a learning track. While I realize that > can be bothersom to some few, it is my experience that the great teachers of > the world have enough patience to cover this bothersomness to begin with, and > enough humility to remember that no matter how much they know... one never > knows when something is been overlooked or missed. ... heck... thats the whole > spirit behind our prime directive here... "there's no such thing as a dumb > question" Well, I don't claim to be a great teacher so I'm off the hook. Besides, I believe there are such things as the occasional dumb questions. (All present questions excepted, of course.) I also believe it's possible to get so bogged down in the abstract that it becomes increasingly difficult to understand the fundamentals of a thing. Del
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