While I'd like to keep this question as generic as possible, I specifically want to cut a slot that's 1/2" long x 3/16" wide all the way through a piece of 3/8"-thick oak. My primary options are probably a router or Dremel. However, I need the slot to be perfectly straight like this:
(If anyone's in the market for a Photoshop expert, please contact me.)
Is a router with a guide my best bet? Is there some other way I could go about doing this?