Anders Eliasson -> RE: Question for the builders (Nov. 12 2013 9:04:04)
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quote: ORIGINAL: Anders Eliasson quote: Do the different shapes make a lot of difference? And there´s a fysical law saying that the fibers that are the furthest away fom the soundboard top surface is the fiber that give you the most stiffness. Think about it. Its all very logical. Something here is lost in the translation. I think you are saying that taller braces are stiffer (well duh!). John. You´re right that taller braces are stiffer. But what I´m trying to say a little bit about is a very complex thing. You´re also right that there might be language issues. I will try one more time. This time simpler. If you make a 7 piece fan layout and you make 7 braces 6x3mm, (for now, forget about the shape of the braces. In order to explain what is happening, lets say that they are square) The difference in stifness, tone and pulsation is VERY big if you glue them 3mm wide and 6mm high versus if you glue them 6mm wide and 3mm high. Why is it so: Because of the physical law that says that the fibers the furthest away from the soundboard is giving much more stiffness to the soundboard than the fibers which are closest to the soundboard. Its the same law that explains why a tube with 1mm wall thickness and a diameter of 20mm is a lot stiffer than a tube with a 1mm wall thickness and a diameter of 18mm. This fact is one of the reasons why you see some classical builders using composite braces, with balsa closest to the soundboard and spruce or carbon fiber the on the outside. Now if life was so that all that we wanted was the stiffest bracing as light as possible, then life would be really easy. But its not. There are so many parameters that you can work on, that it would be impossible to explain all of it on an internet forum. There´s only one way to understand: Build and use your senses and your brain. IMHO, (and this I´ve said many times here), the layout of the braces and the exact size of the body is not the most important. The thickness and width of the braces is important, but the way you shape the braces is where you´re getting to the point of controlling what you are doing. I hope this is understandable.
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