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fluting depth [View Printable]
Towner
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What should the depth of the fluting be around the edge?The top that I just finished the arching on has a fluting depth around .5mm ,its nice and smooth and even but it looks like I could have gone a little deeper.Should I go back and dig it out a little or just leave it?
Posted Feb 17, 2008, 3:59 pm
jbviolin
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Let's see.  If standard edge thickness is around 4.0 mm and the thickness in the middle of the channel (fluting as you call it) is usually 3.2 or 3.3 or so.  That leaves a difference of .7 (or .8).  But this must also be a matter of taste.  I know a del Gesu with very deep and abrupt channeling and I also know one with very shallow channelling.  Of course years of wear have had their toll and you sort of have to decide where the edge height was originally.  .5 is ok but so is .7 but it is all relative to the thickness of the edge.

J Brown
Posted Mar 6, 2008, 11:59 pm
rgravlin
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Towner, it's my understanding that the fluting, aside from aesthetics, is going to have some effect on the flexibility of the perimeter of the plate (more important for the top plate). If your plate is thick at the perimeter, a deeper fluting will give more flexibility and allow the plate to work like a speaker diaphram, something you test for when you push on the center of the top plate. If your plate is thinner, 2.5 mm or less, you have to take edge thickness into account to make sure the fluting doesn't make the plate too thin and lose the stiffness you need. If you make the fluting too deep on a thin plate you can end up with a flabby top.  Since the wood's inherent stiffness enters into this, develop the feel for stiffness vs. flexibility while carving the plate. You don't want the fluting to extend too far in either, a 7 to 10mm wide flute is fine for most.
Posted Dec 12, 2008, 12:09 am
 
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