It will probably burn. With a 1/4" bit, I'd make at least 2 passes, maybe 3. And go as fast as your machine can go. Contrary to what a lot of people think, when cutting wood, if your using at least an 1/8" or 1/4" tool, there's no reason not to cut as fast as your machine can. With smaller tools, you might have to worry about breakage if you go too fast. Going too slow causes excessive heat, and your bits will get dull much faster from the heat. If your machine can cut at 30ipm, make 3 passes at 1/4" and it will get done faster than 1 pass @ 7ipm.