no one ever said you had to cut the circle in one pass...I usually make 3 passes. Taking about 1/4 inch per pass.
si, they say the exact opposite. Multiple passes with no more than a 1/4" per pass depending upon the material being cut. MDF is hard on bits, so it's a really good idea to heed this //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif