Fretboard Glue-up

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Re: Fretboard Glue-up

Postby Peter Wilcox » Wed Oct 09, 2019 3:51 pm

When you say you are "jigging up the neck" into a slight forward bow, are you bending the neck/putting it under tension, then gluing on the fret board? If so, the residual tension in the neck (toward back bow) might be causing the glue to creep, ending up in a back bow.
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Re: Fretboard Glue-up

Postby Barry Daniels » Wed Oct 09, 2019 4:58 pm

The idea that using epoxy is like adding a plastic sheet is erroneous. It will fix the problem you are having. Just have to reset your brain to remove the epoxy bias.
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Re: Fretboard Glue-up

Postby David King » Wed Oct 09, 2019 5:42 pm

I use polyurethane glue. Clamps come off in an hour, same clamping pressure as Titebond, no creep, no moisture introduced. Fingerboards pop off at the joint when absolutely necessary. Most epoxy is reversible with application of sustained heat of 160º-180º F.

You might consider redesigning your fingerboard radiusing system to accommodate the fingerboard and neck as a unit. Trim fret barbs if you go to a harder wood or cut kerfs a couple of .001" wider.
I'd look at denser woods that are more RH stable for your fingerboards. Osage comes to mind.
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Re: Fretboard Glue-up

Postby Mark Wybierala » Thu Oct 10, 2019 9:32 am

I think you jig idea had merit -- I get it -- but not a good idea. I don't fully understand the Titebond/backbow problem but I've encountered it myself and have a client under my wing who encounters it all the time. He brings me necks so I can refine his fretwork and without fail, there is always a slight amount of backbow. Even with a dual action trussrod, I don't like it as it puts the neck into a condition of uncertainty -- somehow seems less heathy than a neck in balance between string tension and trussrod control -- corrupts the mojo
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Re: Fretboard Glue-up

Postby David King » Thu Oct 10, 2019 12:25 pm

I clamp my fingerboards on with relief but they always spring back almost straight when I take the clamps off. I add more relief when i sand the radius. By the time the frets are in they are almost straight again.
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Re: Fretboard Glue-up

Postby Dan Smith » Sat Oct 12, 2019 7:10 pm

Happens to me all the time.
Can’t understand why.
I use a flat clamping caul and glue the board to the neck when both pieces are still flat before radius and carving.
I reckon glue could be the problem, such as expansion and shrinkage that happens when gluing veneer with Titebond. (i now use veneer glue).
Thanks for the insight.
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Them kids was fast as light-nin.
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Re: Fretboard Glue-up

Postby Barry Daniels » Sat Oct 12, 2019 8:28 pm

Titebond contains water. Water expands wood. Pretty simple. Some glues (like epoxy) do not contain water and so the wood remains stable.
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Re: Fretboard Glue-up

Postby Peter Wilcox » Sun Oct 13, 2019 9:54 am

WTF happened to the OP? It weren't me. :o
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Re: Fretboard Glue-up

Postby Barry Daniels » Sun Oct 13, 2019 10:23 am

We must have scared him off? And he took his posts with him? Strange.
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