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RobF -> RE: Fretboard too thin? (Feb. 26 2021 10:31:33)
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Hi Mango, hope you’re doing well, too. 4.5mm for the fretboard is OK. As Echi says, it might not be ideal, but it’s not unheard of, and isn’t wrong, nobody’s going to call you on it.
More importantly, how deep is the neck at the first and tenth*, including the fretboard?
Without reinforcement, a rule of thumb of 22.5mm at the first to 24mm or so at the tenth and you’re probably going to be just fine. But that’s a broad statement without knowing the wood. Thinner might be a cause for concern. If it’s good stiff Cedro you might be OK, though. Mahogany, almost certainly so. Running under 22 would be more comfortable if reinforced, but again, these are broad statements.
Under 21.5, and especially under 21, and you might want to consider corrective action, because that’s getting pretty thin. Even if reinforced, that’s getting lean.
Of course, just my opinion, but not offered without the benefit of some experience. If you haven’t started carving the neck yet, just stick to the rule of thumb and you should be OK.
*edit* correction - the heel end measurement should be taken at the point where the heel carve merges with the neck proper. That would be more like between the eighth and ninth, rather than the tenth.
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