Making inlays with a router is how woodworkers seat contrasting wood, shell, or accent materials into a precise recess that looks intentional instead of patched. A plunge router, guide bushing, and a matched inlay bushing kit — or careful template work — lets you cut the pocket and the plug from the same pattern so the fit stays tight. This guide walks through design, bushing setup, cutting the recess and insert, glue-up, and flush finishing so your first inlay does not become a gap-filling exercise.
Guides
How to Make Inlays with a Router
Make inlays with a router using bushings or inlay kits: cut the recess, mill the insert, glue up cleanly, and flush-sand for a tight fit.
How router inlays achieve a tight fit
Most dedicated inlay bushing sets use one bushing size for the recess and a collar or adapter change for the insert so the plug is slightly larger or sized to match the pocket after accounting for bit diameter. Without a kit, you can still inlay by cutting a template recess and hand-fitting or by using complementary patterns sized for bushing offset. The principle is the same: the pocket and the piece must share a geometry, and your bit must be sharp enough to leave crisp walls without burning a gap wider.
What you need
- Plunge router with a centering-friendly base and bushing set or commercial inlay kit
- Sharp small spiral or straight bit — often 1/8 in. to 1/4 in. depending on detail
- Stable template material and double-sided tape or clamps
- Inlay stock slightly thicker than final flush depth
- Glue suited to the materials, painter’s tape, and sanding blocks for flush-off
Step-by-step inlay process
01
Design for the bit you will use
Inside corners cannot be sharper than the bit radius. Pointed stars and tiny letters need smaller bits and more patience — or designs with filleted corners. Keep fragile narrow webs in the background wood wide enough that the bushing pressure will not break them out. Sketch grain direction: a long inlay parallel to grain behaves differently than a cross-grain patch when the seasons move.
02
Make a rigid template and mark orientation
Cut the template carefully; sand edges fair because every wiggle copies into both pocket and plug. Register marks help you align the pattern on the workpiece and later on the inlay stock. For closed shapes, ensure the bushing can enter the waste. Practice the entire kit sequence on scrap of the same species before touching a tabletop.
03
Cut the recess in the workpiece first
Secure the template to the background wood. Install the bushing and bit combination your kit specifies for the pocket. Set a shallow depth — inlays are often only 1/16 in. to 1/8 in. deep unless the design demands more. Plunge inside the waste, follow the template clockwise or as directed for conventional cutting, and clear chips so the bushing stays down. Vacuum the pocket and inspect walls for fuzz that would keep the plug high.
04
Mill the insert with the matching bushing setup
Move to inlay stock that is flat and a bit thicker than the pocket depth. Change to the insert bushing or collar per the kit. Cut the plug while the template is oriented the same way if the shape is asymmetric. Keep the bit fully through the waste for a clean perimeter; support thin stock over a spoil board. Label the face that will show so you do not glue the wrong side up.
05
Dry-fit, then glue without drowning the joint
The plug should press in with light taps, not require a hammer battle. If it is tight at a whisker, ease a shiny high spot with a chisel or sanding stick — do not enlarge the whole pocket casually. Glue lightly on the pocket floor and walls; excess glue can hydraulic-lock a tight inlay and stain contrasting woods. Seat the plug, protect the face with tape or a caul, and clamp evenly. Wipe squeeze-out before it skins.
06
Flush the inlay and refine the surface
After cure, plane, sand, or flush-trim carefully to the background. A block plane set fine or a card scraper often beats a random-orbit that dishes soft inlay wood. Work up through grits, watching for glue ghosting at the seam. Oil and dye finishes telegraph gaps — if you see a hairline, decide whether burn-in, sanding dust with finish, or living with a craft-honest line fits the piece. Future inlays get better when you note which bushing step caused any slack.
Without a commercial inlay kit
You can cut a recess with a template and bushing, then bandsaw and sand an insert to fit, or cut both parts on a CNC. Another approach uses the same template with carefully calculated offsets. Kits simply speed the matched-pair problem. Whatever path you choose, sharp bits, shallow depths, and scrap rehearsals matter more than brand names.
Material pairings that behave
- Hardwood into hardwood of similar movement when possible
- Stabilize very soft inlays if they will be sanded aggressively
- Pre-seal porous woods if glue stain is a risk on light maple
- Avoid oversized depth on thin veneers that can telegraph voids
- Keep shell and brittle materials for advanced adhesive methods
Troubleshooting gaps and proud spots
Gaps usually mean bushing mix-ups, template shift, dull bits burning oversize, or a plug cut from a flipped asymmetric template. Proud centers after glue-up often mean chips under the plug or a shallow pocket. Chatter on the pocket wall leaves a scallop that reads as a dark line under finish — slow the feed and sharpen. If one corner chips out of the background, a slightly larger redesign or a dutchman-style patch may be cleaner than forcing a mismatched plug.
FAQ
01
Do I need a special inlay bushing kit?
It helps a lot for matched pocket-and-plug work. You can inlay without one, but sizing the insert becomes more manual.
02
What bit size is best for inlays?
Smaller bits capture tighter inside corners. Match bit diameter to the finest detail in your design and to your bushing kit’s recommendations.
03
How deep should an inlay recess be?
Often 1/16 in. to 1/8 in. for decorative wood inlays. Go deeper only when the material or wear requires it.
04
Why is my inlay loose?
Wrong bushing step, template movement, or a dull bit can oversize the pocket. Recut a test pair on scrap to verify the kit sequence.
05
Can I inlay with a trim router?
Yes if it accepts the bushing and you can plunge controllably. Many woodworkers prefer a full plunge base for closed shapes.
06
Should the inlay grain match the background?
Match when you want invisibility; contrast when the inlay is the point. Similar movement rates still help long-term fit.
07
When do I sand flush?
After the glue has fully cured. Flushing too early can shift a partially set plug.