how do I make this cut into a in the middle of the length of a board?
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Classic job for hand tools if you don't own a power router. After the initial marking out the entire job can be done with just one chisel and mallet/hammer, although the long shoulder could be cut with a suitable saw and if the bottom needs to be very clean the rebate would generally be completed using a hand router or router plane. – Graphus Feb 14 '19 at 21:49
I'd recommend cutting this using a router, if you have one. You could use a rabbeting bit with a bearing, a router table with a fence, or clamp a board on top to act as a fence for the base of the router. These would all involve carefully starting and stopping the cut in the right place and will and leave rounded ends where the rabbet starts and ends.
If the ends of the cut really need to be square, you can finish it with a chisel.
In principle, you could use a plane, particularly something like a mortise butt plane. You'd need to define the edges of the rabbet with a chisel, then plane out the rabbet.
I wouldn't recommend it, since the plane would have little bearing surface at the edge, and keeping the cut depth uniform across the rabbet would be a miserable job.
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If you used a plane like this: qy1.de/img/hobel-301034.jpg you wouldn't even have to do much definition with the chisel (and the bearing surface wouldn't be problem). – Martin Bonner supports Monica Feb 15 '19 at 15:33
A router (palm or plunge) can do this, using an edge guide.
Attach the edge guide to the proper distance from the edge. This might require several passes with increasing distance from the edge. If the channel is deep mill in several passes from shallow to deep.
If square corners are required a chisel will be needed to achieve them, as the router will leave rounded ones.
answered Feb 19 '19 at 11:57
