Dear all together,
I was looking around the other topics but I didn't find the right answer for my question. I hope one of you has a good one for that.
I'm a luthier myself and I got one guitar in for repair. It has a loose neck joint (dovetail). The guitar is about 1 1/2 years old.
The owner came in last year for some checks and I already noticed a sunk in top. So I told him to keep an eye on the humidity to get no damage.
I'm asking myself now if low humidity could cause the dovetail joint to fail? Or if it is more likely that it is a mistake in the joint itself?
It's not a big deal to repair, but I'm wondering what could have caused it.
Thanks a lot for your answer and excuse some mistakes. I'm from Germany and so there could be some.
If you have a moisture meter , check the moisture content of the dovetail and moisture content of the neck block after they have had time to acclimate in your shop. If you don't have a moisture meter, hmmm....
I agree. We really don't see many loose dovetails on well-made instruments, regardless of humidity. White glue and aliphatic resin glue will soften and stretch in high heat, so if the joint was loosely fitted, it wouldn't be surprising to see it pull away.
Hide and other glues may not loosen so easily with heat alone, but a poorly fitted dovetail set with hide glue can present its own problem. Hide glue has no gap-filling ability, so if it was loosely fitted to begin with, the glue could dry out, pull away, crack and crumble. That's what we see with old Harmony and Kay instruments, but then, they are old by the time we see them.
WELCOME to the forum :)
What make & model guitar is it?
Those symptoms are quite common for low end "disposable class" Asian imports.
That answer will help us to understand the instrument better.