I'd be a little worried in that the neck has immediately shown such definite bow tendencies - suggests that it's not a very stable piece of wood, and that you might be forever tweaking the truss rod to keep it straight (ie it'd be prone to minor changes in heat/humidity or string gauge changes, etc).

Maybe leave it a day or three and see where it stabilises?

Newbie answer here.

I would leave it for a couple of days to see where it settles. If it gets worse, then the decision would be easy.

The string pressure will pull it a tiny bit straighter and maybe the fretboard could help, if glued on straight. But I don't know what the experienced builders here would do. I guess we will know soon.

@tv101 Yup... I agree... Not a big deal to scrap it. But definitely am curious to see what the overall consensus is. 🙂

@swepri Agreed...

@usadave

Hi Dave, was the neck blank quarter sawn or slab cut? I agree that leaving it for a few days to see if it settles. If it doesn't move from the position that it is in then try supporting it in a neck caul and plane the hump out by hand. 🤷🏻‍♂️

🙏🎸🙂🎶

@usadave You could spend ages messing about with it, using various methods but it’s not worth it for me. I would just start again with a new blank. 
Don’t throw this one out or burn it, you can use it for a myriad of things like making marker dots or repair work bits for other necks etc. 

Posted by: @usadave

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Hi Everyone,

I just finished carving (I should say my CNC just finished carving... lol) a neck blank (from what WAS a dead flat piece of maple) and the neck has developed a back bow. (while not entirely unexpected this is a little more than what I am used to at this stage of the game)  The truss rod that will be installed is a double action one; however, I am wondering if I should continue or just scrap it and try again with a more agreeable piece of wood? If I place a straight edge on the fretboard side the back bow is approximately 1/16 at the heel and headstock.

 

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Any insight would be greatly appreciated!

 

-Dave

My first neck developed back bow after carving, single action rod too! Anyway, week or two later when it came to fret levelling etc it had sorted itself.

Stewmac actually makes a jig for the issue, I think it's pretty common but you can use the jig to hold it level for doing the frets. But with a dual action rod you can just straighten it out anyway.

I'd use it myself, wouldn't worry at all. Worst case I'd make another neck later if it became a problem.