Guides

How to Use a Plunge Router for Stopped Cuts and Mortises

Learn how to use a plunge router for stopped dados, mortises, and template work with controlled depth stops and steady plunges.

Mastering how to use a plunge router opens cuts you cannot start from a board end. Spring-loaded columns let you plant the base, power up, then sink the bit—ideal for stopped dados, mortises, and templates. This guide covers controlled plunges, turret stops, and keeping the base planted like a drill press.

Anatomy you will actually use

Learn the plunge lock, depth rod, and turret stops before chasing fancy jigs. The turret lets you pre-set progressive depths for roughing and finishing passes. The lock freezes the motor at depth so you can travel horizontally without fighting the springs. If those two controls are fuzzy in your hands, pause and practice on scrap until they are not.

Controlled plunge sequence

Set final depth, then stage the turret

With power off, lower the bit to touch the work or a block, zero the scale, and set the finished depth. Arrange turret steps for intermediate passes if the cut is deep. Confirm locks are snug so vibration does not sneak the stop.

Plant the base before you plunge

Clamp guides or templates. Rest the router fully flat with the bit retracted above the surface. Both hands find the grips—and the plunge lever if your model uses one—before the motor starts.

Start the motor, then plunge with intent

Power up, let the bit reach speed, then press down smoothly to the stop. Do not corkscrew or lean sideways during the drop. Once you hit depth, engage the plunge lock if you will traverse.

Travel, then retract while still spinning

Feed horizontally to the end of the cut. Unlock, allow the springs to lift the bit clear while the motor still runs, then switch off. Retracting a spinning bit reduces the chance of scarring the top edge on the way out.

Signature plunge-router jobs

Stopped dados and grooves for shelves and partitions
Mortises for loose tenons or traditional tenons
Template routing with guide bushings
Inlay and recess work with clear visibility
Hinge mortises when paired with a proper jig

Keeping columns honest

Dust on plunge columns makes the action sticky, which tempts you to force the drop and lose square. Wipe columns, keep seals in decent shape, and do not lubricate with greasy products that attract grit unless the manufacturer specifies a particular lube. A smooth plunge is a safety feature, not a luxury.

Feed direction inside a template

When a guide bushing rides inside a template opening, climb-cut forces can get grabby. Favor the feed direction that keeps the bushing pressed against the template wall you intend to follow, and take shallow passes in dense material. If the router starts to self-feed, you are either too deep or going the wrong way for that moment in the cut.

Plunge routers on a table—possible, not always pleasant

Some plunge routers can live under a table, but springs and locks add fuss compared with a fixed base. If you own a combo kit, many woodworkers park the fixed base in the table and keep the plunge base free for handheld joinery. Use the tool where its mechanism helps rather than fights you.

FAQ

Why does my plunge feel sticky or uneven?

Dust and pitch on the columns are the usual suspects. Clean them carefully per the manual and check for dinged rods. A damaged column or worn bushing needs service, not muscle. Smooth travel should return after a proper cleaning in most shop-dust cases.

Should I lock the plunge before moving horizontally?

Yes for most traversing cuts. Locking holds depth steady so spring pressure does not lift the bit and leave a tapered groove. Unlock to retract at the end of the pass. Practice the lock-travel-unlock rhythm on scrap until it is automatic.

How do turret stops help with deep mortises?

They let you rough at a shallow setting, then rotate to deeper stops without remeasuring each time. That keeps heat down and reduces bit deflection. Finish on the final stop with a light cleanup pass for a flat mortise floor.

Can I freehand letters with a plunge router?

You can, but templates or bushing guides produce more consistent results. Freehand work demands a steady base and shallow passes. For sign work, many makers prefer a small bit, clear visibility, and a drawn line they can sneak up on rather than a deep committed plunge.

What size bit works best for mortising?

Spiral upcut bits in a diameter matched to your mortise width clear chips well. Stay within what your router and jig can control—oversized cutters in deep drops get grabby. Multiple passes to width are safer than one heroic cutter.

Is a plunge router better than a fixed base overall?

It is better for stopped cuts and template work; a fixed base is often nicer for continuous edges and table use. Combo kits exist because both motions matter. Choose based on the cuts you make weekly, not a generic ranking.

How do I avoid blowing out the far end of a stopped dado?

Mark the stop line clearly, move deliberately as you approach it, and consider a backer block if the groove exits near fragile grain. Some woodworkers sneak the last fraction with a chisel for a crisp end wall. Shallow passes also reduce the urge for the bit to skate when exiting.