How to Inlay Wood With a Router: The Guide Bushing Method

Router-based wood inlay works by cutting a recess with a template and a guide bushing, not a hand chisel, so the recess matches the inlay shape with almost no gap. The router bit follows the bushing as it rides against the edge of a template, hollowing out the waste inside the outline. Once that recess is cut, a contrasting piece of material – a wood veneer, a strip of banding, or a shape cut from the same template – gets glued in and sanded flush after the glue cures. It is fast and repeatable once the setup is right, but there is one rule that decides whether the result looks professional or sloppy: cut the recess too deep and the inlay leaves a visible gap once it is glued and sanded flush.

How Router Inlay Differs From Hand-Chisel Inlay

Traditional inlay work is done with a marking knife and a chisel: you scribe the outline, pare out the waste by hand, and fit the insert piece by trial and error. It works, but it is slow, and no two recesses come out exactly the same size. Router inlay replaces the hand-paring step with a template guide bushing – a metal collar that mounts around the router’s sub-base and rides against a template’s edge while the bit cuts inside it. Because the bushing keeps the bit a fixed distance from the template edge on every pass, you can rout the same shape as many times as you want and get an identical recess each time. That consistency is the entire reason router inlay is worth setting up for anything beyond a single one-off project.

A Router Inlay Kit Cuts Both Halves From One Template

The detail that makes a dedicated inlay kit worth using instead of a single guide bushing is that it cuts both pieces from the same template. First you rout the recess in the base material with a larger snap-on collar fitted over the bushing, which offsets the bit outward slightly. Then you remove that collar, clamp the same template to your contrasting inlay stock, and rout the insert piece with the bushing running directly against the template edge. Because both cuts trace the identical template outline, just with a different offset, the insert comes out very slightly larger than the recess – enough for a firm friction fit once you tap it into place, without needing to hand-fit the edges. This two-pass, one-template approach is the standard method taught by inlay kit manufacturers like Rockler, and it is the main reason router inlay work is repeatable in a way hand-cut inlay never is.

The Guide Bushing Offset Math Most Guides Skip

Almost every router inlay tutorial tells you to “make a template,” but skips the one calculation that determines whether your inlay actually fits: the template opening is not the same size as the finished recess. Because the guide bushing has its own outside diameter and the bit cutting inside it has a smaller diameter, the bit’s cutting edge sits offset from the template edge by half the difference between the two. The usable formula is:

Template opening size = finished recess size + (bushing outside diameter – bit diameter)

As an example, a 3/8″ outside-diameter bushing paired with a 1/4″ straight bit adds roughly 1/8″ to whatever recess size you actually want, because the offset works out to half the 1/8″ difference between the two diameters, applied around the entire perimeter. Cut the template at the recess’s finished dimensions without accounting for this and the actual recess routs oversized on every project until you notice why. This is also exactly why an inlay kit that includes a matched bushing-and-bit set removes a real source of error – the offset is fixed and repeatable because the manufacturer pairs the parts, instead of you guessing at a mismatched bushing and bit from separate purchases.

Step-by-Step: Cutting the Recess and the Inlay Piece

1. Secure the template. Attach the template to your workpiece with double-sided tape or clamps so it cannot shift mid-cut – any movement here transfers directly into the recess shape.
2. Install the guide bushing and bit. Thread the guide bushing into the router’s sub-base, then chuck in a straight or spiral downcut bit sized to match the kit’s offset calculation.
3. Rout the recess with the offset collar in place. Set the plunge depth (see the next section), then guide the bushing around the inside edge of the template in a series of shallow passes rather than one deep plunge.
4. Clean out the waste. Clear remaining material inside the recess with light freehand passes or a chisel, checking that the bottom is flat and the depth is even across the whole recess.
5. Switch templates to your inlay stock. Remove the offset collar, clamp the same template to the contrasting inlay material, and rout the insert piece so the bushing rides directly on the template edge.
6. Dry-fit before gluing. Tap the cut piece into the recess by hand. It should seat with light pressure – if it will not go in at all, sand the edges slightly; if it is loose, the recess was cut oversized and needs a thicker glue line or a re-cut insert.

If you are choosing a router for this kind of work for the first time, a mid-size plunge router with adjustable depth stops – like the one covered in our Bosch 1617EVS review – makes the depth-control step below far easier than a fixed-base trim router.

Depth Control: The Difference Between a Perfect Fit and a Visible Gap

Depth is where most router inlay projects go wrong. Set the plunge depth to leave the recess very slightly shallower than the actual thickness of your inlay material – a few thousandths of an inch proud is normal and expected. Sanding flush after the glue cures removes that tiny excess and levels the inlay to the surrounding surface. Rout the recess even a little too deep, though, and there is no way to sand your way out of it: the inlay sits below the surface, glue fills the gap, and that gap stays visible under any finish. If your inlay material is thicker than your bit’s flute length allows in one pass, take it in two or three shallow passes and re-check the depth with the actual inlay piece between each one, rather than trusting the router’s depth scale alone.

Gluing and Sanding the Inlay Flush

Once the dry fit looks right, spread a thin, even layer of wood glue in the recess with a small brush or a scrap of wood, then press the insert into place. Clamp it or weigh it down with a flat caul while the glue cures so it cannot creep back up as the glue swells the wood fibers slightly. Wipe away squeeze-out with a damp cloth before it skins over – dried glue left on the surface will block stain and finish from penetrating evenly later. Once the glue has fully cured (follow the manufacturer’s stated cure time, not just “dry to the touch”), sand the inlay flush with the surrounding wood using progressively finer grits, checking often with your hand rather than your eyes, since a slightly proud edge is easier to feel than to see.

Common Router Inlay Mistakes

• Routing too deep: the single most common mistake – it cannot be corrected by sanding, only by using a thicker shim of veneer under the insert or re-cutting a new recess.
• Tear-out at the recess edge: happens most on plunge entry and exit; a sharp bit and slower feed rate at the template edge reduce it.
• Chip-out on brittle or figured inlay stock: back the inlay material with painter’s tape or a sacrificial backer board while cutting the insert piece.
• Inconsistent depth across the recess: usually caused by the router tipping slightly on an uneven workpiece – a flat, well-supported base plate and a level workpiece fix this.

Frequently Asked Questions About Router Inlay

What size guide bushing do I need for inlay work?

It depends on the bit you are pairing it with, not a fixed size – a common combination is a 3/8″ outside-diameter bushing with a 1/4″ straight bit. Use the offset formula above (template opening = finished recess size + (bushing outside diameter – bit diameter)) to check any bushing-and-bit pairing before cutting your template.

How deep should a router inlay recess be?

Slightly shallower than the thickness of your inlay material – leave a few thousandths of an inch of the insert standing proud so sanding after gluing brings it flush. Cutting the recess to the exact thickness of the insert, or deeper, leaves a visible gap once the piece is glued in and sanded.

Can a router inlay kit cut the insert piece as well as the recess?

Yes – that is the main advantage of a dedicated kit like the Rockler guide bushing kit over a single bushing. You rout the recess with an offset collar in place, then remove the collar and rout the insert from contrasting stock using the same template, so both pieces trace the same outline with the correct built-in offset for a snug fit.

What is the easiest way to inlay wood with a router?

Using a router inlay kit – a template guide bushing, a matching offset collar, and a straight or spiral downcut bit – is the most repeatable method, because the recess and the insert are both cut from the same template rather than fitted by hand.

Conclusion

Router inlay work comes down to two things: a template guide bushing setup that cuts the recess and the insert from the same outline, and depth control precise enough that sanding – not a hand-fit gap – is what brings the inlay flush. Get the offset math and the depth right and the guide-bushing method is far more repeatable than hand-chiseled inlay, which is exactly why it is the standard approach in every inlay kit built around it.