Izzy Swan shared the woodworking jig featured in this video.
This video demonstrates a quick, jobsite-friendly jig that adapts a small table saw sled to cut tricky double miters on deep trim pieces using common scrap and basic tools.
The approach removes much of the head-scratching by letting a single known angle set the jig and produce both mating cuts reliably.
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Design and Purpose
The jig is designed to solve a common finish-work problem: cutting a deep trim piece that needs a double miter where one edge is a shallow bevel and the opposite edge is much steeper.
It is intended for use on a jobsite where a full shop setup or specialty tools may not be available.
Because the jig mounts to a sled and pivots at a single point, it reduces complex angle calculations to a simple alignment step, which makes the setup faster and less error prone.
Building the Jig
The basic build uses two small plywood pieces to form a platform and a pivoting top made from a slatted section to support the workpiece.
A small spacer under the pivot keeps the top from binding and allows smooth movement, while a loose screw or similar stopper at the rear holds the chosen angle in place.
Nothing exotic is required: the components are screwed together, a straight fence is added for clamping the workpiece, and a pivot point is established so the top can be raised and locked where needed.
Setting the Angle and Cutting
One useful principle is that if the builder knows one of the mating angles, the jig can be adjusted so that the complementary cut falls into place automatically. The method is to mark the known angle on a sample, align that mark with a center reference on the jig, lock the top, and then transfer that alignment to the saw for cutting.
Cuts are made safely by making shallow passes and raising the blade incrementally until the full profile is achieved.
For the mating profile, the piece is flipped and the center mark is transferred so the inverse cut lines up with the previous face.
Practical Tips and Adaptations
Small, consistent spacers under the pivot — like washers or folded cards — work well to maintain an even gap and reliable pivoting action. Using a loose or adjustable screw as a stop lets the operator reposition the top quickly without over-constraining the jig.
The jig scales to different material depths by changing the length of the top or the position of the fence, and it can be adapted on the fly with clamps or a temporary wedge if a finer lock is needed.
Why This Method Matters
This approach is valuable for finish carpenters who need a repeatable solution under jobsite constraints and who do not have access to a bandsaw or a fully equipped shop. It saves time, reduces calculation errors, and delivers clean mating miters with minimal setup.
Beyond the immediate jobsite use, the technique is easy to adapt for different profiles and thicknesses, making it a handy skill for anyone doing angled trim or custom millwork in the field.
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