what i do when roughing is a fast speed and heavy feed , and interrupt the cut by stopping the feed or if feeding by hand stop and back off to break the chip but you will still get stringers. need to be careful not to get them tangled on you as they will cut. on the finish use a fast speed and a light cut but the feed can still be fast. after roughing and drilling let it cool as it gets hot fast. again watch the stringers as they tangle fast, god luck. jonesie