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PostPosted: Wed Oct 27, 2010 3:13 pm 
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Mahogany
Mahogany

Joined: Thu Jul 23, 2009 4:54 pm
Posts: 96
First name: Devin
Last Name: Cox
City: Edmond
State: Oklahoma
Country: usa
Focus: Build
Status: Amateur
I was looking at a picture of a top,
Image,

that uses a similar bracing to the one Im working on right now and noticed a hole in the utb that looks to be there to give access to the truss rod.
My brace is 16mm high, does this brace need such a hole in order to adjust the truss rod?

Thanks,
Devin


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PostPosted: Wed Oct 27, 2010 3:46 pm 
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Koa
Koa

Joined: Sun Sep 16, 2007 1:27 pm
Posts: 583
Location: United States
It does if you want to be able to EASILY adjust your truss rod.
Unless, you designed it for adjustment at the other end.

That said, make sure you also put some sort of cutout in the popsicle brace behind the utb to leave room for the wrench to reach the truss nut.
AND, make sure that when you rout for the truss that you do so with a wedge so that the slot is deeper at the heel end than the nut end. Otherwise you could end up with the top of the truss nut being hindered by the top. Trust me, you don't want to fix that one after you're ready to attach the neck.

IF you've already put the top on and haven't drilled the hole (like I did once), the world hasn't ended. I've used a good, sharp, drill bit wrapped in a stiff tape to make it big enough to grip and drilled a hole with my fingers alone. Then reamed it out with bigger and bigger bits until the desired size was aquired.

Good luck.

Dave


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PostPosted: Wed Oct 27, 2010 4:05 pm 
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Mahogany
Mahogany

Joined: Thu Jul 23, 2009 4:54 pm
Posts: 96
First name: Devin
Last Name: Cox
City: Edmond
State: Oklahoma
Country: usa
Focus: Build
Status: Amateur
Dave,
I have attached the brace to the top already, I guess a long bit is in order.

thanks,
Devin


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PostPosted: Wed Oct 27, 2010 8:54 pm 
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Brazilian Rosewood
Brazilian Rosewood

Joined: Fri Apr 02, 2010 10:35 pm
Posts: 2561
Country: USA
Focus: Repair
Status: Professional
Some companies make a curved adjustment tool that fits around the brace so they don't have to cut a hole through a critical support beam right at the point where the guitar is trying to fold in half from the string tension.

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PostPosted: Wed Oct 27, 2010 11:25 pm 
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Contributing Member
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Joined: Sat May 17, 2008 1:11 pm
Posts: 1884
Location: Spokane, Washington
First name: Pat
Last Name: Foster
Country: USA
Focus: Build
Status: Semi-pro
Ball-ended hex wrenches are readily available, which allow you to work at an angle. That's what I did on my first, and it's not a problem. I'm assuming of course that there's an Allen-head on the truss rod.

I don't believe a hole there is an issue if it's close to the top, away from the bottom of the brace.

Pat

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PostPosted: Thu Oct 28, 2010 10:05 pm 
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Brazilian Rosewood
Brazilian Rosewood

Joined: Fri Apr 02, 2010 10:35 pm
Posts: 2561
Country: USA
Focus: Repair
Status: Professional
I've seen more Martins needing neck resets after 15 years than Gibsons, since Martin started installing truss rods, for what that's worth.

Structurally the closer the hole in the brace is to the soundboard, the stiffer the brace will remain.

I don't cut holes in my transverse braces, as it bears the most load, which is why it is the stiffest brace in the guitar as well, other opinions may differ.

beehive

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