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#1
06-04-2016, 10:37 AM
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Radius tops?
Acoustic guitars with radius tops...which direction does the radius run? Heel to tail block or perpendicular across the top bass to treble bout? Probably a real dumb question but I've always wondered?
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Jim Dogs Welcome......People Tolerated! Last edited by llew; 06-04-2016 at 01:30 PM. 
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#2
06-04-2016, 10:53 AM
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The X braces have a radius, so both directions.
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Derek Coombs Youtube -> Website -> Music -> Tabs Guitars by Mark Blanchard, Albert&Mueller, Paul Woolson, Collings, Composite Acoustics, and Derek Coombs "Reality is that which when you stop believing in it, doesn't go away." Woods hands pick by eye and ear
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#3
06-04-2016, 10:56 AM
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Depends on the guitar.
Most are spherical radius. Some have a flat perimeter, but some variety of doming upward in the center. This can also be done by constructing it as a true flat top in low humidity. When exposed to medium/high humidity, it will dome up on its own. True flat assembled in medium humidity will be prone to going concave and cracking in low humidity. Some are cylindrical (curved across the width, straight from neck to tail). I'm sure someone has tried a guitar with longitudinal radius only but I don't know of any specifically. But some instruments like bowl back mandolins have a canted soundboard, which has a similar effect.
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#4
06-04-2016, 01:25 PM
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llew, the radius is induced by shaping (arching) a ‘curve’ into the braces - the edges that are glued to the underside of the soundboard. The soundboard is placed in a ‘radius dish’ which can be from 25 to 50+ foot concave ‘scooped’ outa it.
Think of the imprint a - say 25 foot beach ball would leave in the sand. The braces have that curve and are pressed into the soundboard when gluing in the dish which forces the soundboard into the desired arch along and across ways. A lot of makers use vacuum presses for this mow. ‘Doming’ adds strength to a structure - think egg or a domed roof, it also has sonic benefits - sustain being one.
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I play an 'evolved' (modified) Cowboy guitar Not sent from my iPhone using Tapatalk
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