Learning how to cut hinge mortises with a router helps doors hang the way you meant. A neat pocket lets the leaf sit flush so gaps stay even and screws bite solid wood. This guide covers jig choice, depth to leaf thickness, the cutting sequence, and chisel work that squares corners a round bit cannot finish.
Guides
How to Cut Hinge Mortises with a Router
Learn how to cut hinge mortises with a router using a jig, shallow passes, and careful depth setting for flush-fitting leaves.
Why a router beats endless chisel chopping
Hand-chopped mortises can be beautiful, but a router with a hinge jig produces consistent depth across a set of kitchen doors in a fraction of the time. Consistency matters more than romance when you are hanging twenty doors and every leaf must land at the same plane. Keep a sharp chisel ready anyway—you will still square the corners.
Gear that makes hinge mortising predictable
- Palm router or compact plunge router
- Straight bit sized for your jig (often 1/4 in or as the jig specifies)
- Hinge mortising jig or a well-made template for your hinge size
- Calipers or the hinge leaf itself as a depth reference
- Sharp chisel for corners and a marking knife for layout
Step-by-step mortising
01
Layout from the actual hinge
Mark hinge locations from the door or frame style you are matching. Knife the perimeter if you are working without a commercial jig. Confirm top and bottom offsets so doors in a run look related.
02
Clamp the jig dead secure
Any wiggle in the template telegraphs into a sloppy mortise. Clamp so the router base or bushing has full support. Protect finished faces with pads.
03
Set depth to the leaf thickness
Use the hinge leaf or calipers. The leaf should finish flush or a whisper deep—not proud. Test on scrap the same thickness as the door edge. Remember that paint-grade doors and solid hardwood may want slightly different final feels once finish builds.
04
Rout in shallow passes
Keep the base flat, move steadily, and do not linger in corners. Clear chips between passes. Stay inside the template line; the bushing or bit bearing is your fence.
05
Square corners and dry-fit the leaf
Chisel the rounded corners to match the hinge. Drop the leaf in. It should sit flat without rocking. Pare carefully if high spots remain; do not deepen the entire mortise because one corner is tight.
06
Drill pilot holes and hang
Self-centering bits help screws land on the hinge holes. Drive screws snug, then check swing and reveal. Adjust with careful planing or shim strategies only after the mortise geometry is right—do not bury mistakes under longer screws.
Common defects and quick fixes
- Proud leaf: deepen slightly with a careful second pass or pare the floor
- Rocking leaf: high spot in the floor—scrape or sand locally
- Blowout on the show edge: next time use a backer or lighter final pass
- Mortise too wide: hinges will not save a wallering template—stop and remake that spot with a patch if needed
Production tips for a run of doors
Batch the layout, then batch the routing, then batch the corner squaring. Changing depth between hinge brands mid-stream is how inconsistent reveals happen. Keep a story stick or marked story pole for hinge locations on a matching set of doors so you are not re-measuring from scratch each time.
FAQ
01
What size router bit should I use for hinge mortises?
Follow your jig’s recommendation—often a 1/4-inch straight bit with a specific guide bushing. The bit must match the bushing offset the template was designed around. Random bit swapping without checking offset will cut oversize or undersize pockets. When in doubt, test the full jig setup on scrap before touching a door.
02
Can I cut hinge mortises without a commercial jig?
Yes. A shop-made template from plywood or MDF, carefully sized for your hinge and bushing offset, works well. Some woodworkers also clamp a straightedge and freehand carefully, but templates are more repeatable. Invest layout time once; it pays back across every door in the house.
03
How deep should a hinge mortise be?
Match the leaf thickness so the leaf sits flush with the surrounding wood. A hair deep can be acceptable on paint-grade work; proud leaves almost always look wrong and affect gaps. Always dry-fit before drilling every screw on a full run of doors.
04
Why do my mortise corners stay rounded?
Because router bits cut circles. Square them with a sharp chisel to match the hinge leaf corners. Pare vertically to the knifed line rather than chopping aggressively into the floor. Clean corners make the leaf sit without visible gaps.
05
Palm router or full-size for hinges?
A palm router is the usual favorite for hinge jigs because it is light and easy to control on a door edge. A full-size plunge router also works if the base fits your jig. Choose the tool that sits stably on the template without hanging off into space.
06
How do I keep doors in a set looking consistent?
Use the same jig, the same depth setting, and the same story stick for locations. Do not reset depth between doors unless hinges change. Hang one door completely as a proof before batching the entire kitchen blind.
07
What causes tear-out around the mortise?
Dull bits, aggressive depth, and exiting into unsupported grain are common causes. Score the perimeter with a knife, take lighter passes, and keep the template tight. On brittle veneers, a climb-cut skim before the main passes can help—used with caution.
08
Should the hinge barrel sit proud of the door edge?
Barrel position depends on hinge type and desired reveal; follow the hardware instructions. The mortise depth discussion is about the leaf sitting flush in its pocket. Mis-mortising to “fix” barrel position usually creates new gap problems—adjust geometry thoughtfully instead.