5 shop-made jigs every beginner furniture maker should build first

A jig is a precision guide that turns a one-time setup into a repeatable process. In furniture making, where parts need to match each other across an entire set of chairs or a run of cabinet doors, jigs are how consistent results happen — not by skill alone, but by building precision into the setup so the skill gets applied to holding material and reading results, not to re-solving the same geometry problem on each piece.

These five jigs can be built in a morning with scrap plywood and MDF, and they cover the recurring setup problems in most furniture shops.

1. The table saw cross-cut sled

The miter gauge that ships with most table saws is adequate for rough cross-cutting. It is not adequate for furniture-grade cross-cutting — it has slop in the bar, it is short, and it cannot support wide stock for repeatable, square cuts.

A table saw sled replaces the miter gauge for cross-cutting. The sled rides in both miter gauge slots (two runners, not one) and has a tall rear fence perpendicular to the blade. The result: no slop, wide support surface, and a fence that can be adjusted square to the blade with a precision square and then locked.

Construction: 3/4-inch Baltic birch plywood for the base (flatter and stiffer than shop birch or OSB). Hardwood or UHMW runners that fit the miter slots snugly without slop or wobble. A rear fence of 1-1/2-inch stock (two layers of 3/4-inch plywood, glued and clamped). Front fence of lighter material, primarily to keep the base square during construction.

Setting the fence square: attach the rear fence temporarily, make a cross-cut, flip the cut piece 180 degrees and butt it against the fence again. Any error in squareness is doubled in this test. Adjust the fence until the doubled error is zero, then permanent-fasten.

A well-built cross-cut sled handles stock up to 16 inches wide (the sled base is typically 24 inches) and provides perfect repeatability on furniture parts. This is jig number one because every furniture project benefits from it.

2. The tapering jig

A tapering jig guides stock through the table saw at a controlled angle, cutting a tapered profile on a board — an angled cut that begins narrow at one end and widens toward the other. Tapered table legs are the primary application: a furniture leg that is, say, 2 inches square at the top and 1 inch square at the floor, cut on two opposing faces.

Simple version: two pieces of plywood or hardboard hinged at one end. Set the angle by opening the hinge until a measured offset is achieved at a measured distance from the hinge. Lock the angle with a stop block or threaded rod knob. The work piece rides against the jig body; the jig body rides against the fence.

Commercial equivalent: the Jessem Taper/Straight Line Jig and the Lee Valley Tapering Jig are both well-designed commercial versions. Either is worth buying if you make tapered legs regularly. Building your own makes sense if you need an unusual angle range or a longer reference surface than commercial jigs provide.

Key setup: always make the first taper on opposite faces. Cut one taper, flip the leg 180 degrees (so the tapered face is now against the jig), cut the second taper. The taper is symmetric. If you cut four faces in sequence without flipping, each subsequent cut has a different starting geometry and the result is a leg with four different taper angles.

3. The mortising fence

Hollow chisel mortising machines and router-table mortising setups both benefit from a fence with indexed stops — a stop block that can be repositioned to a measured location and locked, so you can cut a series of mortises at the same location on a series of parts without measuring each time.

Simple version for the router table: a fence extension made from 3/4-inch MDF with a T-track routed into the front face. Two aluminum stop blocks ride in the T-track and can be tightened at any position. One stop defines the start of the mortise, the other defines the end. The parts are indexed against these stops; the router bit cuts the mortise between them.

For a hollow-chisel mortiser: a sliding table with side stops achieves the same result. The part registers against the table fence and slides until it hits the stop; the chisel descends. Multiple stops can be set on a rod or T-track to cut different mortise positions on the same part without re-measuring.

Consistent mortise location is the difference between a frame-and-panel door that assembles square and one that is parallelogram-shaped after assembly. The stops make consistency automatic.

4. The router edge guide for stopped dados

Dados cut across the width of a board — for shelf supports, for the bottom of a drawer box, for the back panel of a cabinet — are most consistently made with a router and a straight bit, guided by a fence. The problem with a standard router fence is that it follows the edge of the board, and if that edge is not straight, neither is the dado.

A shopmade edge guide uses two reference points: a fence that registers off the edge of the board AND a stop block that positions the guide at a specific distance from the end of the board. This controls both the angle (the dado is perpendicular to the edge) and the location (the dado is exactly where it needs to be for the shelf or drawer bottom to fit).

Construction: a piece of 3/4-inch plywood approximately 6 inches wider than your widest stock. A fence of 1-1/2-inch stock glued and screwed to the underside, positioned to give the correct offset from router base to bit. Clamp the guide to the work piece, route the dado.

For through dados: the guide can be a simple fence clamped to the work. For stopped dados (which stop before reaching the edge of the board, so the shelf does not show from the front of the cabinet), mark the stop point with tape on the router base and stop the cut when the tape mark reaches the end of the guide.

5. The shooting board

The shooting board is a simple flat reference surface with a fence set exactly 90 degrees (or 45 degrees, or any target angle) to a channel where a hand plane rides. The work piece registers against the fence; the plane trims the end of the piece exactly square (or to the target angle) in a controlled, repeatable motion.

Construction: two pieces of 3/4-inch MDF — a base and a step. The step is glued to the base, offset by the width of the hand plane body minus the sole height. This creates a channel where the plane lies on its side and the sole rides along the step edge while the blade trims the work piece resting on the base.

The fence is a hardwood or MDF strip glued to the base at exactly 90 degrees to the channel. Setting this angle with a precision square and then test-trimming a piece and checking with the square is how you verify the jig before committing.

What it solves: mitered corners that do not close, end grain that is not quite square after the saw, parts that are a hair too long for their opening. A few strokes on the shooting board produce a surface that is flat, square, and dead-on dimension. This is the tool that eliminates the "close enough but not quite" fit that shows up in every picture frame joint and most drawer fitting situations.

A mitered 45-degree shooting board is made by changing the fence to 45 degrees — the exact same construction, different fence angle. Use both 90 and 45 degree boards in the same fixture by making the fence removable with a fixed pin that ensures the angle is repeatable.

Building jigs before you need them

The temptation is to build jigs reactively — build the sled when the next project requires cross-cuts, build the tapering jig when the dining table order comes in. The cost of reactive jig-building is that you build the jig while you are under deadline pressure, and jigs built under deadline pressure are jigs that will need to be rebuilt.

Block out one or two sessions to build the five jigs listed above before your next project begins. The sessions are productive woodworking — you are building precision tools that will make every subsequent project faster and more accurate. Treat it as infrastructure, not overhead.