How to Rout Stopped Slots Accurately
Stopped slots and grooves are useful for a variety of woodworking joints. Unlike a through groove, a stopped slot ends before reaching the edge of the workpiece, keeping the joinery concealed in the finished project.
Cutting these slots at the router table is straightforward, but there's one challenge: Knowing exactly when to stop the cut.
This is especially important when routing a slot that's stopped at both ends.
As you feed the workpiece past the router bit, the board can cover your stop mark on the router table fence. By the time the mark becomes visible again, you may have already routed too far.
Fortunately, there's a simple layout trick that makes it easier to keep track of the cut.
Add an Arrow Before Your Stop Mark
Before routing, mark the stopping point on the workpiece or fence, depending on your setup.
Then draw a bold pencil arrow just ahead of the stop line.
The arrow acts as an early warning that you're approaching the end of the cut.
As the workpiece moves across the router table, watch for the arrow to come into view.
When you see it, you'll know you're getting close to the stopping point and can slow your feed rate.
Continue carefully until the reference marks align, then stop feeding the workpiece.
Make the Stopped Cut Easier to Control
For accurate results, take time to establish the starting and stopping positions before switching on the router.
Mark the cutter's position on the fence and use it to determine where the slot should begin and end.
If the slot requires several passes, keep the same reference marks for each cut.
A few additional precautions will help:
- Use clear layout marks. Make the arrow large enough to see easily as the workpiece moves.
- Take light passes. Rout the slot to its final depth gradually rather than removing all the material at once.
- Maintain control. Keep the workpiece firmly against the fence and tabletop, using appropriate push blocks or hold-downs.
- Use stop blocks when practical. A securely positioned stop block can provide a physical reference for repeatable cuts.
The arrow is a visual reminder, not a mechanical stop. For precise stopped cuts, particularly when the cutter is hidden by the workpiece, use a suitable stop-block setup or jig to establish the cut's endpoints.
A Simple Trick for Better Router Table Joinery
Sometimes the most useful shop tips are also the simplest.
Adding a pencil arrow ahead of your stop line gives you a visual warning as you approach the end of a stopped slot.
It's a quick addition to your layout that can help prevent overcutting and make router table joinery easier to manage.
Shop tip submitted by Bill Hamilton, Bethany, Illinois.
How to Cut Spline Slots in Miter Joints
Splines add strength to mitered joints without changing their clean appearance. Learn two practical methods for routing accurate spline slots using a router table or a simple shop-made jig.
LEARN TO CUT SPLINE SLOTS → Strengthen Mitered Corners with Concealed Joinery
