Seems to me that this is job for a router table.
Need to put a groove down the length of a small (less than 3 feet)
2x4. Was thinking I could do this by hand. It's a small groove. Not
more than 3/8 of a inch or so and only about 1/2 deep.
Either a router table with a fence, or a dado stack in the table saw ...
depends on what you have.
Personally, I would go for the dado stack on the TS, but I'm set up to
do that quicker, but either will work.
You could do it with a circular saw and a sawboard. With the right
blade you can get excellent results and it pretty much eliminates
splintering. You'd just have to take a couple of passes and move the
sawboard a bit for the second cut.
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