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I’ve been thinking about making this jig for years. Since nice weather has arrived I have to make a picket fence. All slats will end to a sharp point, meaning I have to cut them at an acute angle. I used to do that on the tablesaw but each time I got several cutoffs flying around my head. No more !!!
The jig sits on the miter saw bed and is held down to the back fence with a spring clamp. Note that the fence of my saw is coated with PSA sanderpaper which prevents any shifting.
The jig is nothing more than a 1/4’’ plywood base and 3/4’’ plywood back and perpendicular fences. This latter must be square to the back fence and square to the base.
As shown, I clamp a workpiece to the perpendicular fence, slide the whole assembly to the line of cut (reason why I use a spring clamp), and then cut safely the acute angle.
An alternative to using a clamp to hold the workpiece to the perpendicular fence is adding a backer board between the fence of the saw and the back fence of the jig (shown in photos 1-2-3-6). This way the workpiece rests against this backer board, which prevents the saw blade from catching and kicking it towards the back.