Normally I like to make joints, including drawer grooves, an easy fit; by that I mean I don't want to have to use a hammer to get things together but I don't want any wobble or rattle...I want to be able to press them together with my hands. For bottoms, I normally make the grooves VERY slightly over the material thickness, ease the bottom's edges slightly and all goes together well.
Not this time. The 1/4" ply - which is actually 3/16" - was slightly warped and I knew it would be a bear to get everything together so I made the grooves 1/32" over. All goes together well but naturally there is a gap between the bottom and the groove. I fixed that by ripping off a strip of stock with the saw blade at 4-5 degrees; that gets me a strip of wedges. Cut off a bunch so they are about 3/4" square, dab of glue, slide them into the crack on the bottom side forcing the bottom up and no more crack, no more rattle. Is that cheating?
And while I'm on the subject, does anyone else use a wedge to fill in a gap in other imperfectly fitting joints?