Installing hinges cleanly can make or break a woodworking project. Even a well-built cabinet door, box lid, or piece of furniture can suffer if the hinge mortises are uneven, oversized, or poorly aligned. A hinge that doesn't sit flush can also affect how smoothly a door or lid opens and closes.
This shop-built adjustable hinge mortising jig takes much of the guesswork out of the process. Designed for use with a trim router, the jig makes it easy to rout clean, consistent hinge mortises with very little setup. Best of all, the hinge itself is used to set the jig, eliminating much of the measuring and layout normally required.
A Simple Jig for Better Hinge Installation
One of the most useful features of this jig is how quickly it can be adjusted for different hinges. Instead of building a dedicated template for every size of hinge, the jig uses a two-part base and adjustable stops that move to match the actual hardware you're installing.
To set it up, place the hinge in the jig and adjust the guides to match its dimensions. Once everything is locked in place, the jig becomes a routing template for creating an accurately sized mortise.
Using the hinge itself as the setup reference also makes the jig useful for repeat work. If you're installing several identical hinges on a cabinet or piece of furniture, you can leave the jig set and move from one location to the next for consistent results.
One Jig for Different Hinge Sizes
The adjustable design allows the jig to handle hinges from about ¾" up to 3⅛". That range makes it useful for everything from small boxes and lids to cabinet doors, shop cabinets, and larger furniture projects.
Rather than keeping several commercial templates on hand or making a new jig every time you encounter a different hinge, this one can be quickly resized to suit the hardware you're using.
That versatility is especially handy in a woodworking shop where one project might require a small hinge for a box while the next calls for larger butt hinges on a cabinet door.
Using a Trim Router to Cut the Mortise
A lightweight trim router is a natural match for this jig. Its compact size makes the router easier to control while following the guides, and there's less bulk to manage when you're working near the edge of a door, lid, or other workpiece.
The jig's aluminum guide rails provide a smooth, accurate path for the router. After setting the cutting depth to match the thickness of the hinge leaf, you can guide the router around the jig to remove the waste and create the mortise.
Taking a few light passes rather than removing all the material at once gives you better control and helps produce a clean, crisp mortise. Once the routing is complete, the hinge should sit neatly in place and flush with the surrounding surface.
Take the Guesswork Out of Hinge Mortises
There are several ways to cut a hinge mortise. Traditional methods often involve careful measuring, marking, knife work, and chiseling before slowly fitting the hinge into place. Those techniques work well, but they can be time-consuming, particularly when a project requires several hinges.
This router jig simplifies the process by turning the hinge itself into the setup reference. Once the jig is adjusted, the router follows the guides and removes the material needed for the hinge.
The result is a clean, repeatable mortise with less layout and fewer opportunities for error. On projects with multiple doors or several matching hinges, that consistency can save quite a bit of time.
A Handy Router Jig to Keep Around the Shop
The best woodworking jigs are often the ones you can use on a wide variety of projects. This adjustable hinge mortising jig is compact, easy to store, quick to set up, and versatile enough to handle many of the hinges you're likely to encounter when building furniture, cabinets, boxes, and other woodworking projects.
If you've ever struggled to get hinges seated evenly and flush with the surface, this jig provides a straightforward way to make hinge installation faster, easier, and more consistent.
Interested in building this jig? Get the complete step-by-step plans to build your own Hinge Mortising Jig from WoodsmithPlans.com!
