I'd like to investigate using my drill press to cut sideways. Google
hasn't been much help, but I gather that real router bits and drill
presses don't mix. Ok, won't go there.
In previous projects I've cut groove waste with a series of Forstner
holes, but that leaves dimples from the guide point. (Cheap Forstners.
Very cheap.) I've also used my circ saw to whittle out the bulk of long
grooves, then cleaned up with chisels.
In my most recent project, I had to do two 22 inch long 3/8 inch
wide grooves (among others). A snaggle-toothed beaver would have done a
neater job. I did the shorter grooves with a dozuki--neat as a pin.
So, I look over at the drill press. (I'm a Reformed Neander.) If not
router bits, maybe one of those drill-bit-like saw blades that go in (I
think) some kind of wall-saw?
"Keep your ass behind you."