The Framers Forum

.....you maybe need to tweak the left-hand fence. Usually it needs fine-tuning by swinging it slightly towards you. I'm talking a gnat's eyebrow here. It's handy to have a strip of scrap timber to set the machine properly. About 3" wide is ideal. Or if you have a few offcuts of wide moulding, even better. Mitre 4 short pieces the same length and dry fit them together. If there is a gap on the inside, swing the left fence toward you a tad. Cut 4 more. If there still is a gap, tweak it a bit more. If you start getting a gap on the outside, you have tweaked too far. Not very scientific, but it works. Eventually you develop a feel for setting this up. Forget about using angle gauges and such. You can set the angles to dead 45 deg, but it doesn't mean they are going to cut 45 deg. Wood is springy stuff and a tiny deviation in angle will be magnified x4. You might also have to tweak the left fence more as the blades get dull.