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Steven Bollman
PostPosted: Sat Oct 12, 2013 4:15 pm 
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Where is the center point of a braced top in regard to a radius dish? Is it the center of the X-brace? Thx.
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SteveG
PostPosted: Sat Oct 12, 2013 4:29 pm 
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Doesn't matter with a radius dish because the radius is constant, or the same, everywhere in the dish.

cheers


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Burton LeGeyt
PostPosted: Sat Oct 12, 2013 4:57 pm 
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I do not use a complete radius for the top plate and my center point (or highest point) is in front of the bridge, more or less close to the center of the x brace.

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Steven Bollman
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SteveG wrote:
Doesn't matter with a radius dish because the radius is constant, or the same, everywhere in the dish.

cheers


Well, if I don't use a radius dish, how do I know where to establish the center point? I'm going to use 3x5 index cards.


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the Padma
PostPosted: Sat Oct 12, 2013 6:45 pm 
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Good question!

Being an arch top carver, me likes to place the high point of both plates at the bridge. But as Steve pointed out, a radius is a constant even though in reality this is no constant in the universe ...seems that even the speed of light is a variable. So about the only "constant" we can count on is change and umm death. Now what?

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Tom West
PostPosted: Sat Oct 12, 2013 7:09 pm 
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Steven: I have a couple of dreads here and just looked at them. The high point "looks like" it's somewhere between the narrowest part of the waist and the lower edge of the sound hole. I must say that I don't intentionally work to do that but it just happens as a result of how I work the top edge of rims. The rims are basically worked to get .500" between the top and the bass E with about .095" action at the 12th fret.
Tom

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Steven Bollman
PostPosted: Sun Oct 13, 2013 12:43 am 
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Todd Stock wrote:
If the top retained a true radius, it would be mid way from tail to neck joint, or 10" in from the tail block on a 20" long body. If the guitar is built with a combination radius (e.g., 28' for X and 60' for UTB, there may be a slight shift towards the tail, but still likely very close to mid-body, which is where the X-intersection will sit.


Thanks, Todd. BTW, what is UTB?
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SteveG
PostPosted: Sun Oct 13, 2013 2:16 am 
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Upper Transverse Brace - It's the brace across the upper bout that gets notched into the lining.


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Steven Bollman
PostPosted: Sun Oct 13, 2013 11:52 am 
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SteveG wrote:
Upper Transverse Brace - It's the brace across the upper bout that gets notched into the lining.


Thanks, Steve. Is it the baseball bat?


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SteveG
PostPosted: Sun Oct 13, 2013 1:16 pm 
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Ha. When I hear baseball bat I think of old Gibson necks... Dunno about them regarding bracing.

On a modern dread there are 2 braces that go across (or almost across) the upper bout on the top bracing. The one that's glued on flat is the top plate or popsicle brace. The other one is not as wide but thicker and is notched into the lining, and that's the UTB or number one brace. It's the one that often has a "flatter" radius than the other braces on the lower bout.

cheers
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