A router cuts profiles into wood edges — round-overs, chamfers, ogees, beads — turning rough lumber into finished trim or cabinet doors. The tool is fast, precise, and unforgiving: a router taking too aggressive a pass tears out the grain or kicks back. The fix is matching bit to material, depth to bit, and direction to material orientation.
This guide covers using a handheld router on an edge — the most common DIY application. Plunge routing, dadoes, and template routing follow similar principles but aren't covered here.
Before you start
Three things to settle:
1. Direction matters: against rotation. Router bits spin clockwise viewed from the top. To cut cleanly, feed the workpiece against rotation — this means the router moves left-to-right when working on the front edge of a board. Reverse direction and the router climbs the wood, kicking back violently.
2. Multiple shallow passes, not one deep. Routers can take 1/2 inch deep passes — but that's a recipe for tear-out, kickback, and burned bits. Better: 1/8-1/4 inch per pass, multiple passes to reach final depth. Slower but cleaner and safer.
3. Bearing-guided bits for edge work. Most edge profile bits have a bearing at the tip that rolls along the workpiece edge — the bearing controls the bit's lateral position. No fence needed; bit follows the edge naturally.
What you'll need
Tools
- Router (1.5-3.5 HP, fixed-base or plunge)
- Router bits (carbide, with bearings for edge work)
- Wrench (for bit changes)
- Push pad (for narrow edges)
- Speed square (for clamping straight edges)
Materials
- Workpiece (lumber to be routed)
- Sandpaper (220 grit) — for cleanup
- CSA safety glasses
- Hearing protection (NRR 25+)
- Dust mask (router throws fine dust)
- Optional: dust collection adapter
Bit selection drives results
Carbide-tipped bits last longer and cut cleaner than HSS. For finish work, always carbide.
Common edge profiles: round-over (rounded edge), chamfer (45-degree bevel), ogee (S-curve), bead (small round bump), cove (concave). Match profile to design intent.
Step-by-step instructions
Pick the bit and verify it's the right shank size
Most routers accept 1/4 inch and 1/2 inch shanks (sometimes 8 mm in European tools).
Larger shank (1/2 inch): more rigid, less vibration, cleaner cuts. Use when possible.
1/4 inch: smaller routers and lighter profile bits.
Don't force a 1/2 inch shank into a 1/4 inch collet.
Install the bit
Unplug the router (or remove battery on cordless).
Insert bit into collet so the shank is fully inserted minus a small gap (1/8 inch — allows for thermal expansion).
Tighten collet nut firmly with the wrench (most routers have spindle lock or two-wrench system).
Spin bit by hand — should turn freely with no wobble.
Set bit depth in test material
Bit should protrude from the router base by the desired cut depth, plus the bearing height.
Adjust router's depth-of-cut mechanism per manufacturer.
First pass: half the final depth (rough cut). Second pass: full depth (finish pass).
Test on scrap before workpiece.
Secure the workpiece
Clamp workpiece firmly to a workbench or sawhorses. The workpiece must not move during routing.
Edge to be routed extends past the bench edge so the router has clearance.
Don't try to hold workpiece by hand — clamps mandatory.
Set router on workpiece, bit clear of edge
Position router with bit hanging over the workpiece edge — bit not yet in contact with wood.
Hold router with both hands.
Plug in (or insert battery).
Power on and ease bit into wood
Hold router still while powering on (motor jumps slightly on startup).
Slowly move router so the bit's bearing contacts the workpiece edge.
Bearing rolls along the edge — that's your guide.
Don't push hard; let the cutter do the work.
Move in correct direction
On front edge of a board (with router on top): move left-to-right.
On back edge: move right-to-left.
On end-grain edge: rout end-grain first (so any tear-out at the end gets cut off when routing the long-grain edge).
Move at steady, moderate pace — too slow burns wood, too fast leaves rough cut.
Multiple shallow passes
First pass: shallow depth setting. Cuts most of the profile.
Reset depth deeper.
Second pass: cuts to final depth.
For deep profiles (heavy ogees), 3-4 passes may be needed.
Lift router off when done
When you reach the end of the cut, lift router straight up off the workpiece (don't drag).
Power off and wait for bit to stop spinning before setting down.
Sand the routed profile smooth
Even with carbide bits, the profile has small ridges and tear-out spots.
Sand with 220 grit — fold sandpaper to match the profile shape.
Sanding sponges in matching profiles work well.
Common mistakes that cost you
- Wrong direction (climb cutting). Router climbs the wood, kicks back violently. Always feed against rotation.
- Too deep in one pass. Tear-out, burns, and dangerous kickback. Multiple shallow passes.
- Workpiece not clamped. Workpiece slides during cut — ruined cut, possible injury. Clamp firmly.
- Wrong bit for material. HSS bits in hardwood = quick dulling and burning. Use carbide-tipped.
- Skipping safety glasses. Routers throw fine wood chips at high speed. CSA mandatory.
Frequently asked questions
Plunge router or fixed-base router?
Fixed-base: simpler, lighter, better for edge profiles.
Plunge router: bit can plunge into the workpiece mid-cut — for inlays, mortises, signs.
For most edge work, fixed-base is enough.
How fast should I move the router?
Steady pace — about 1-2 ft per 10 seconds for most cuts.
Too slow: wood burns (visible browning).
Too fast: rough cut, tear-out.
Listen to the motor — should run at full speed without bogging down.
Why are there burn marks in my cut?
Causes: dull bit, moving too slow, bit dwelling in one spot, soft wood (cherry burns easily).
Solutions: sharp carbide bit, steady pace, light passes.
When to call us instead
Our finish carpenters use routers daily for trim, cabinet doors, and built-ins. Crisp profiles, clean edges, no tear-out.
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