Don’t Make These Router Jig Mistakes

A router sled can leave your wood looking perfectly smooth — and still completely twisted. Here are 7 common router jig mistakes that waste timber, create unnecessary sanding, and quietly destroy woodworking accuracy. In this episode of The Nordic Fixer, we explore why a good router flattening jig isn't necessarily the most expensive or sophisticated one. It's the one that maintains an accurate reference, keeps the workpiece stable, and delivers consistent results. From misaligned router sled rails and distorted plywood carriages to cutting direction, excessive cutting depth, and unstable slabs, I'll explain the mistakes that turn a simple flattening job into hours of rework. You'll learn: Why two perfectly straight rails can still produce a twisted board How screws and plywood distortion affect router jig accuracy Why smooth sliding doesn't always mean precise cutting How shallow, consistent passes can reduce chatter and sanding Why router feed direction matters for safety and control How to shim and secure an uneven slab before flattening How better preparation means less dust, less noise, and fewer unnecessary cuts No oversized workshop required. No expensive machinery just for the sake of it. Simply smarter woodworking decisions, practical tools, and a little Nordic workshop logic. *CHAPTERS* 00:00 – Why a perfectly smooth board might not be flat 00:42 – Mistake 1: Trusting the wrong reference surface 01:42 – Mistake 2: Screws that distort your router carriage 02:46 – Mistake 3: Router sled rails that aren't coplanar 04:11 – Mistake 4: Smooth movement vs. real precision 05:24 – Mistake 5: Removing too much wood in one pass 06:37 – Mistake 6: Cutting in both directions 08:06 – Mistake 7: Failing to stabilize the wood slab 09:14 – Less noise, less dust: The neighbour-friendly workshop 10:11 – Why accuracy starts before switching on the router 10:34 – The thickness planer myth 10:50 – Next: 3 Ways to Get Flat Boards in a Tiny Workshop *WOODWORKING REFERENCES & FURTHER READING* These technical resources provide additional information on router sled design, slab flattening, workshop safety, and lumber preparation. 1. Rockler — How to Flatten a Wood Slab with a Router Sled An overview of router flattening jigs, precision guide rails, cutter selection, and slab-flattening techniques. 2. WOOD Magazine — Shop-Made Flattening Sled An example of a rigid, practical router sled built with plywood and steel channel. 3. OSHA — Handheld Router Safety Technical guidance covering router hazards, workpiece stability, flying chips, and safe operating practices. 4. WOOD Magazine — Face-Jointing Without a Jointer Explains how a sled and shims can help flatten a warped board using a thickness planer without a traditional jointer. 5. OSHA — Wood Dust Exposure Information about woodworking dust hazards and dust-control measures. 6. OSHA — Noise in Woodworking Practical recommendations for reducing workshop noise and protecting hearing. *COMING NEXT* Think a thickness planer automatically makes a warped board flat? Not quite. In my next video, "3 Ways to Get Flat Boards in a Tiny Workshop," I'll show you three practical approaches — including one that doesn't require a jointer or thickness planer. Subscribe to The Nordic Fixer and turn on notifications so you don't miss it. *ABOUT THE NORDIC FIXER* The Nordic Fixer is about smarter woodworking decisions, Scandinavian furniture details, practical tools, honest materials, and better workshop organization. Less noise. Less dust. Fewer unnecessary purchases. More method. Smart Woodworking, Built for Hygge. #Woodworking #RouterJig #RouterSled