Introduction

Dados and grooves are essential joinery cuts used in woodworking for strength and precision.
Whether you’re building a bookshelf, cabinet, or drawer, knowing how to cut them accurately on a table saw will take your woodworking skills to the next level.

In this guide, we’ll cover:

  • The difference between dados and grooves
  • Tools and blades you need
  • Step-by-step cutting techniques
  • Safety tips and pro tricks for perfect results

What Are Dados and Grooves?

  • Dado: A slot cut across the grain of the wood.
  • Groove: A slot cut with the grain of the wood.

Both are used to hold panels, shelves, or other boards snugly in place for strong, hidden joints.

Tools & Blades Needed

  1. Table Saw with Adjustable Fence
  2. Dado Blade Set – Stacked dado set or wobble blade for wider cuts.
  3. Standard Rip or Crosscut Blade – For narrow grooves.
  4. Zero-Clearance Insert – Reduces tear-out on slot edges.
  5. Featherboards – Keep workpiece tight against the fence.
  6. Push Stick or Push Block – For safe feeding.

Step 1: Choose the Right Blade

  • For wide dados/grooves (1/4″ to 3/4″), use a stacked dado set.
  • For narrow slots (under 1/4″), use your standard blade and make multiple passes.

Pro Tip: Stacked dado sets produce cleaner, flatter-bottom cuts than wobble dado blades.

Step 2: Mark Your Cut

  • Use a pencil or marking knife to outline where the dado/groove will be.
  • For critical joints, mark both edges of the cut to guide your setup.

Step 3: Set Up Your Blade Height

  • Blade height should equal the depth of the slot — usually 1/3 the thickness of the board for strength.
  • Example: For 3/4″ plywood, set blade height to 1/4″.

Step 4: Set the Fence or Miter Gauge

  • For grooves (with grain): Use the rip fence for guidance.
  • For dados (across grain): Use the miter gauge or a crosscut sled for accuracy.

Step 5: Make the Cut

For Dado Blade Sets:

  1. Install the dado stack to match your slot width.
  2. Position your workpiece and feed steadily through the blade.

For Standard Blades:

  1. Make the first pass along one edge of the slot.
  2. Shift the fence slightly and make a second pass.
  3. Repeat until the slot is at full width.

Step 6: Test the Fit

  • Use a scrap piece of the mating board to test the fit.
  • Adjust fence or blade setup if the slot is too tight or loose.

Step 7: Repeat for Multiple Pieces

  • For cabinet or shelf projects, ensure each dado/groove is identical in size and position.
  • Use a stop block for repeatability.

Safety Tips

  • Always use a push stick or push block to keep hands away from the blade.
  • Never cut dados or grooves without proper workpiece support (sled, gauge, or fence).
  • Wear safety glasses and hearing protection.

Pro Tips for Cleaner Dados & Grooves

  • Use a zero-clearance insert for crisp slot edges.
  • Slow, steady feed rate prevents tear-out.
  • For plywood, use a scoring cut — raise blade just enough to nick the surface, then make the full-depth cut.

Common Mistakes to Avoid

  • Cutting too deep — weakens the board.
  • Feeding too fast — causes rough edges.
  • Forgetting test cuts — can lead to poor-fitting joints.

Conclusion

Cutting dados and grooves on a table saw is a fundamental woodworking skill that improves both strength and precision in your projects.
With the right blade, proper setup, and attention to detail, you can achieve professional-quality joinery every time.