I recently tried using my 1/2" straight bit to cut a depression in the back of a piece of pine the put in a clock. I had set the path offsets @ 3/8" . Cut Passes set to depth of 1/4" total depth of 3/4". I started the project and walked away to do something else. I came back within a few minutes and smelled a burning smell coming from the machine. I stopped the project and opened the machine. I found first pass had been completed and second pass was almost done. The saw dust behind the cutter was packed as it always is behind a dado cut but was smoldering in about four places. I use a dust collector. Question is was I trying to cut too deep or too wide too fast. Any thoughts would be appreciated.