I think I know what’s happening.

You need to take the end of the board as it’s coming out of the planet and apply some upward pressure on it when it gets to the end.

Planers aren’t really meant to do this job, obviously. It’s a jointers job.

I think what’s happening is that at the end of the cut the planer is pushing upwards on the sled at…

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Depending on budget, a 16-32 thickness sander is an invaluable tool (I have the supermax and it’s great). A planer is pretty rough on most guitar woods. I do this sort of thing on my thickness sander.

The other thing is that it could be flat, but curved. Meaning that if you clamped it against something flat, it would be flat, but it’s naturally taking a curved shape.

Again that might not be suitable for a neck blank. But for me after I mill the neck (including the back, on CNC) I clamp the fingerboard and the neck together against a…

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Yeah you want to take cuts that are barely anything. Mark the surface up with pencil cross hatches and take the tiniest cut possible. You should see the planer catch in some places and not others. As you slowly come down it should take more and more and then your complete pass should be flat.

The other thing could be that the wood is got…

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