I have noticed that a lot of people use router bits designed for skimming a thin layer off of their tables / spoil board to level them out - like this one.
http://www.amanatool.com/bits-fv/rc-2257.html
I have been toying with trying to use something like this to face the 2 x 4s once the cnc router is built. The 1/2 in collet version of these bits are not that wide, so certainly multiple passes are needed - and then the cutting is still across the grain.
I have also seen 4 inch long router bits that in concept at least, could be set up sort of like a jointer / planer, capable of 2 x 4 use. I realize that the boards would not always end up with 4 flat / square sides, but if you saw how my hand sanding is coming out, you can imagine that anything might be better.
Besides the obvious - a planer and jointer would be better aspect, is there anything fundametal that I am missing ?
Thanks