Bought this black walnut cookie off of Facebook marketplace for a good price. The only catch is it is warped, cracked, cupped, and twisted. It's about 4 in thick and that's plenty of material to make a coffee table, but I need some advice and guidance on making a router planing jig please.
YouTube is definitely your friend here. So many great woodworking channels. There's a woman who does this kind of project all the time, and unfortunately her channel name escapes me. If I can find it again, I'll add a comment for you.
Maybe this is a dumb question, but why not just use a hand plane?
This looks to be end grain which takes a toll on a blade edge and would be extremely laborious with a hand plane.
A hand plane removes the same thickness of wood wherever you run it, so getting something flat (that isn't already flat) is a challenge.
A router sled/jig (not sure exactly what to call it, I'm not an expert either) acts as a flat reference.
A hand plane is for both thicknessing and straightening a board. A hand plane does not remove the same amount of material unless the board is already flat. The long flat heel of the plane serves as a reference surface. There is some skill required to not taper the workpiece and you can use winding sticks to check your progress as you flatten the workpiece.
A router sled/CNC router will be able to accomplish the same thing.
I'm no expert, but I've seen better people than me getting boards to nearly flat with only a hand plane.
They're usually the "back to pre-power-tools woodworking" types.
A handmade home for woodworkers and admirers of woodworkers. Our community icon is a planter box made by @Captain Aggravated, the winner of our summer '24 woodworking contest. Congratulations!