Due to some trim work, I need to shave off several 1 in x 3 in x8 feet boards.
I need to shave off the 1 in thickness by 3/8 inches EXCEPT for a rectangular of 1 in x 7 feet, with one side shared with the board. In other words, I need to shave off in a U shape three sides of the board. This is so it would fit into some door jambs.
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What is the best and safest tool to achieve this, even if somewhat time consuming? Would a wood router do this, and if so should I get plunge or fixed-base?
I'd prefer avoid using a table saw due to various factors including cost.