The reason they do this is because endgrain to endgrain glueups are not particularly strong or have much surface area. Miter splines are simply a 45° miter joint with slots cut into the corners to accept spline reinforcements. What I was suggesting was lining both like that on a vertical cnc setup, and just using the cnc to cut both.Ībout your current project: You shouldn’t have to angle your end mill or tilt your piece if your including dog bones.If you’re already using 3D toolpaths, just switch to ball nose and cut the whole piece out at 90°. You then just flip the pieces over and fit them together. This is how they do it with hand held router jigs. If you had a vertical setup, you could either do them separate with a flat end mill or with a dovetail bit you cut both the tails and pins at the same time by lining both pieces up perpendicular to each other.
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