Interesting. Looks like just the fingerboard is halved. I'd want to go a step further and see a whole neck done like that. Never would have thought of it. Neat!
Reminds me of this little fella: This is a real live lobster in Blijdorp Zoo, and those are his natural colors: https://en.wikipedia.org/wiki/Chimera_(genetics)?wprov=sfti1
In this case I think any differences in expansion/contraction likely would be kept in check by the fact that they're glued to solid maple underneath. Thinking about it, I've never heard of a rosewood board separating from a maple neck due to temperature changes. Of course, that doesn't mean it hasn't happened. Still, the two woods may have similar thermal response, or fretboards generally might be too well-attached for it to matter.
How about a fretboard with striped, alternating wood/color by fret? I suppose that would almost be like having full-sized "inlays".
Yeah that's what I was thinking first up, but the rosewood is on the brighter treble side so it should even out.. Right??
I don't have a problem with a rosewood fingerboard on a maple neck, in fact I feel a two piece like that is more stable and more predictable than a one piece neck.. what I suspect is a half and half fingerboard has to introduce different rates of expansion and contraction, thus the potential for a twisted neck exists as one half the fingerboard's dynamics come into play with the other half's .. r
Waiting for someone to turn up with the mathematical equations to show exactly which wood would be optimum under each string - a half and half split isn't nearly fiddly enough, I want to see 6 different woods at least... possibly a genetically modified tree with a smooth gradation from one tonewood to another... ...oh, also, what are the pros/cons and techincal challenges of roasting just the maple part?
My buddy's brother built him this bass several years back. He told him "Don't ever ask me to build another one like that" It was a PITA
I suspect it does happen, but only in extreme temperature shifts like house fires or leaving the guitar in a trunk. If the guitar is separated we blame it on other things, like the glue softening or fire. A real thin strip of wood, like a fretboard, bends pretty easily and it'll just follow where the thicker maple neck goes. The glue joint won't fail unless the pressures pointing different directions exceeds the glue strength, and that won't happen at normal temperatures.
Adding on, I have seen larger joinery that failed. Old furniture that's been left in a shed for years sometimes has glue joints separate, especially when the grain is in different directions. But then, that usually takes years of temperature shifts and humidity. Some days we get 50f temperature swing and the coldest day is about 100f colder than the hottest one. Veneers separate in these conditions too, although in that case it may be more about moisture.
