The Yonico 31340-SC 5/16" works as expected and makes a clean cut and dovetail joint on the Leigh D4R router guide. When purchasing an up spiral router This is a double flute straight cutter that comes with a Leigh pilot cutter designed to handle a lot of small "overshoots". This is NOT Lee's fault, it's the way straight flute cutters cut. Straight bits cut , splitting wood. Upward twist drills cut, cutting through the wood and throwing the scrap up and away from the next cut. The scrap that comes with purchasing a Yonico three-groove bit is also much thinner and doesn't contain large "chunks". After cutting 16 gouges, regardless of the direction of the router in the wood, all cuts are clean I could not get a clean cut , whether I was moving into the wood or into the wood with a straight knife. As long as I'm happy By the way: I cut a very old, dry-grained Douglas fir from old wood.
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