Cut a 90° Pocket Jig to Reach Angles Past Your Miter Saw's 45° Limit
One of 2 takes on Miter Saw Angles Past 45°
The Problem
A miter saw's table swings to roughly 45° left and right and no further. That covers ordinary corners, but trim and moulding work throws steeper angles at you — odd-angled walls, sharp returns, acute corners in older houses that were never square to begin with. Set the saw to its stop and you still can't reach the cut, and freehanding it isn't an option on a finish piece.
The Technique
Rather than trying to make the saw swing further, this jig changes the angle the workpiece sits at — and the saw builds the jig itself.
- Stick a straight piece of 1×6 trim board to the base of the miter saw with double-sided carpet tape. It needs to sit flat and not shift.
- With the board taped down, cut into it at 45° from one side. Swing the saw to 45° the other way and cut again. The two cuts meet to form a 90° pocket — a V-notch — in the board.
- Because the saw cut that pocket, it's referenced to the saw's own geometry: bring the saw back to zero and the blade path bisects the 90° pocket at exactly 45°.
- Set your workpiece into the pocket with an edge against each face of the V. It's now presented to the blade at 45° instead of square.
- Cut. At the saw's zero mark you get 45°, and swinging the saw off zero adds to the 45° the pocket already gives you — which is how you reach angles the saw can't get to on its own.
- Test on scrap and hold it against the real corner before cutting finish material.
Pro tip: The accuracy comes from the jig being cut by the same blade that will cut your workpiece. You're referencing the saw against itself instead of measuring and clamping a fence at an angle you worked out separately, which is where the error usually creeps in.
Pro tip: Cut a test piece and hold it in the actual corner rather than trusting the number. Walls in older houses are rarely the angle you assume, so it's faster to dial the setup in against the real opening.
Safety note: Carpet tape can let go, and a jig that shifts mid-cut is dangerous. Press the board down firmly, and check it hasn't crept before each cut. The pocket also puts the workpiece — and your hands — in a different position than usual, so lower the blade with the saw off first to see exactly where it travels, and keep both hands well outside that path.