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PostPosted: Mon Nov 01, 2010 8:31 am 
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Cocobolo
Cocobolo

Joined: Thu Mar 19, 2009 10:52 am
Posts: 133
State: PA
Country: USA
Focus: Build
Status: Amateur
I'm working on my 1st steel string guitar (a parlor) after building a half-dozen classicals. In his book, Kinkead drills a hole through the upper-bout transverse brace to gain easy access to the truss rod adjustment: a long hex wrench would allow adjustment without having to put your hand into the body. With the small sound hole of the parlor, this approach seems appealing. On the other hand, putting a hole through the brace does not seem like a good idea structurally. Anyone have experience with this issue? idunno


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PostPosted: Mon Nov 01, 2010 8:48 am 
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Contributing Member
Contributing Member

Joined: Sun Jan 27, 2008 4:10 pm
Posts: 2764
First name: Tom
Last Name: West
State: Nova Scotia
Country: Canada
Focus: Build
Status: Amateur
Steve: The UTB is quite a large brace. I find that the hole ends up somewhere near the middle of the brace. With compression on top and tension on the bottom there is very little force acting on the middle of the brace where the hole is located. This has been done on thousands of guitars and not been a problem that I know.
Tom

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PostPosted: Mon Nov 01, 2010 12:04 pm 
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Koa
Koa

Joined: Tue Jul 22, 2008 9:34 pm
Posts: 514
Location: ottawa, ontario, ca
First name: Mike
Last Name: McNerney
City: Ottawa
State: On
Country: Ca
Focus: Build
Status: Amateur
Depending on the size of the hex the distance between the UTB and TR, there is a wrench available from High Mountain I believe that may work without drilling the hole?
MM

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Mike McNerney


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PostPosted: Tue Nov 02, 2010 7:15 am 
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Brazilian Rosewood
Brazilian Rosewood

Joined: Wed Apr 08, 2009 9:34 am
Posts: 3081
I use either a maple brace or laminated spruce/rosewood/spruce and drill a 5/16" hole at the appropriate depth...usually about 3/32" from the spruce top.


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