This project was built and designed by Jodee from Inspire Woodcraft.
Jodee shows how a simple, multi-purpose tenoning jig can be made from a stable MDF offcut and a handful of common shop techniques to handle 90-degree tenons, angled tenons, picture frame spline slots, and even low-angle raised panel cuts.
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Design and Purpose
The jig is designed around a simple face, a saddle for the fence, and a back piece that ties everything together so the assembly resists flex and stays repeatable.
Its core idea is modularity: dovetail grooves in the face accept removable dovetail clamps and interchangeable fences, letting the same base jig perform many tasks with quick reconfiguration.
Construction Overview
Jodee builds the jig from flat, stable MDF to minimize movement and keep the reference surfaces consistent during cuts.
The face receives dovetail grooves routed a short distance from the long edges so standard dovetail clamps can slide in and lock fences, while braces on top prevent twisting under load.
Joinery and Hardware
The assembly is held together with screws suited for MDF to avoid splitting, and no permanent glue is used so the jig can be disassembled or modified later.
Wax is applied inside the grooves and on mating surfaces to ease sliding parts and to make any double-sided tape easier to remove after use.
Setup and Cutting Methods
Fences are adjustable and removable, allowing simple 90-degree tenon cuts by setting one fence square to the blade and tightening a clamp to hold the workpiece.
By using two fences set at complementary angles, the jig can hog out the center of stock for angled bridle joints, cut spline grooves for picture frames, or produce low-angle raised panel cuts with consistent setup between passes.
Practical Tips and Adaptations
Jodee emphasizes checking for square to the table early in the build and using sacrificial backers when tear-out is a concern; double-sided tape helps secure thin backers quickly.
The dovetail clamp system makes it easy to reuse fences and parts from other shop jigs, reducing clutter and letting the same components serve multiple jigs and workflows.
Why This Jig Matters
This jig streamlines a range of joinery tasks by prioritizing adjustability and repeatability instead of a single-purpose setup, making it especially useful in a small shop where versatility is valuable.
Its modular approach shows how a few well-placed grooves and clamps can unlock many cutting operations without complex fixtures or permanent modifications.
Conclusion
As demonstrated, the multipurpose tenoning jig is a practical shop solution for anyone wanting a single fixture to handle tenons, splines, and angled joinery without swapping large sleds or dedicated jigs for each task.
Support Jodee by visiting his online store here: https://inspirewoodcraft.com/collections/all.
Matt’s Take
These are my personal thoughts and tips based on my own experience in the shop. This section is not written, reviewed, or endorsed by the original creator of this project.
This modular approach really makes sense for most of us working in smaller shops. The dovetail groove system is clever because it gives you that rock-solid connection when you need it, but everything stays adjustable. I’ve found that MDF is actually ideal for jigs like this — it’s stable, machines cleanly, and won’t move around on you like solid wood might.
One thing I appreciate about this design is how it handles the most common tenoning challenges. Getting consistent, square cuts is all about having solid reference surfaces and good clamping pressure. That back brace detail is smart because it prevents the flex that can throw off your cuts when you’re putting real force into the workpiece.
The wax application is a detail worth noting — it’s one of those small things that makes a big difference in how smoothly everything operates. When you’re making multiple passes or adjustments, having parts that slide easily saves time and frustration. And using screws instead of glue means you can always modify or repair sections as your needs change.
For anyone considering building this, take your time with the initial setup and check everything for square multiple times. A jig is only as good as its accuracy, and once you’ve got it dialed in, you’ll probably find yourself reaching for it more often than you’d expect.