Joinery Jigs & Guides for Dadoes, Mortises & Dovetails

Woodworking Joinery Jigs & Guides for Repeatable, Accurate Joints

Even the sharpest router bit produces poor joinery if the workpiece isn't guided precisely. This collection covers the jigs, sleds, and templates that locate your cut exactly where it belongs — from precision dado jigs that ride a factory edge to box joint jigs indexed by the table saw miter slot, dovetail spline systems, and combination router bases that handle mortises, hinges, and trim cuts in a single adjustable platform.

Joinery jigs eliminate the measuring, marking, and repositioning steps that introduce error in hand-layout methods. A dado jig registered to the workpiece guarantees the shelf groove lands where the shelf will sit, not close to it. A box joint jig indexed to a miter gauge slot produces perfectly uniform fingers on every pass.

Dado Jigs, Box Joint Jigs & Router Bases

The Precision Router Dado Jig clamps to the workpiece and guides the router base in a dead-straight path for accurate shelf dadoes. The INCRA I-Box jig works at both the table saw and the router table to index box joint finger spacing with gear-driven precision. The tapered dovetail spline system creates decorative reinforced miters using a router bit, sled, and brass guide in a single coordinated package.

Pair these guides with bits from the joinery router bits collection, and dial in bit height quickly with router bit setup jigs & blocks. The full breadth of jigs, fences, and templates lives in the router jigs & guides collection.

Frequently Asked Questions

What is a dado jig for routers and why would I use one instead of a table saw dado stack?

A router dado jig clamps directly to the workpiece and guides the router base along a straight path to cut a precise dado. It is useful when the workpiece is too large to run across a table saw, or when a dado stack is not available. The router approach also eliminates the need to raise a blade, making it practical for job-site or bench-top setups.

Can I use a box joint jig on both a table saw and a router table?

Yes. The INCRA I-Box jig is designed to work in both settings. At the table saw it pairs with a dado stack; at the router table it pairs with a straight or spiral bit. The gear-driven index mechanism delivers identical spacing in either configuration.

What is a coping sled and how does it improve router table safety?

A coping sled holds a workpiece vertically or at a controlled angle for end-grain cuts at the router table, such as coping rail ends on cabinet doors. The sled controls the workpiece against the bit, preventing kickback and chipout that can occur when pushing small or narrow stock against the fence unsupported. See the coping & crosscut sled for a purpose-built option.

What is a dovetail spline jig used for?

A dovetail spline jig guides a sled at 45 degrees across a mitered corner, allowing a dovetail bit to cut a slot that accepts a tapered dovetail spline. The spline mechanically locks the miter, reinforcing it against racking and adding a visible decorative accent to boxes, frames, and case corners.

How do mortise and hinge jigs work?

A mortise jig, such as the M Power router base accessories, attaches to the router and provides a guide bushing that follows a template or fence to cut a square or rectangular recess. Hinge mortise jigs position the cut at a precise inset from the door edge so hinge leaves sit flush with the surface.

Are router joinery jigs compatible with any brand of router?

Most jigs in this collection are compatible with standard router base diameters or work through a replaceable insert system. Check the product listing for specific base diameter compatibility. Universal base-plate options in the router base plates & bushings collection can extend compatibility to a wider range of routers.

What's the most important joinery jig for a beginner woodworker?

A precise dado jig is arguably the most immediately useful, since dadoes and grooves appear in nearly every cabinet and shelf project. Once dadoes are mastered, a box joint jig opens up decorative corner joinery. The Infinity Tools woodworking blog covers technique for both.

Do I need a router table to use joinery jigs?

Not always. Dado jigs and combination router bases are designed for handheld router use. Box joint jigs and coping sleds, however, require either a router table or table saw. Check each product's specifications to confirm whether table mounting is required.

Can joinery jigs be used with CNC routers?

Traditional mechanical jigs are designed for hand-guided or fence-guided routing and are not intended for CNC use. CNC joinery is typically controlled through toolpaths rather than physical jigs. Browse the CNC router bits & accessories collection for CNC-specific tooling.

What quality guarantee does Infinity Tools offer on jigs and guides?

Infinity Tools stands behind the quality of its products. Full terms are described on the quality guarantee page.

Joinery Guides