Claire WhitakerBy Claire Whitaker

Updated November 2026

Learning how to cut grooves in wood with a router lets you make clean, square channels for shelves, dividers, and panel backs in one pass. You will set up the router, choose the right bit, and cut a groove whose width and depth match your project. The method works with a plunge or fixed-base router and needs only a straight bit and a straightedge guide.

Choose the Right Bit and Router Setup

A straight router bit is the standard choice for grooves. Match the bit diameter to the thickness of the material that will slide into the groove, then confirm the actual width with a test scrap, because plywood is often thinner than its nominal size. Use a bit with a shank that fits your collet, and keep the cutting length no longer than needed to reduce vibration.

Shopping for one? See our guide: 7 Best Router Bit to Cut Wood Options for Every Project (2026).

Set the Depth and Guide

For most shelving work, a groove depth of about one-third of the board thickness is a reliable starting point. Set the depth in stages rather than cutting the full depth at once. Clamp a straightedge or edge guide to the workpiece so the bit tracks a consistent distance from the edge, and measure the offset from the guide to the bit’s outer edge before you start.

Cut the Groove in Passes

  1. Clamp the workpiece flat on a stable surface, with the waste side of the cut facing up.
  2. Set the bit depth to about one-quarter of the stock thickness for the first pass.
  3. Turn the router on before the bit touches the wood, then plunge slowly or lower the base onto the surface.
  4. Feed the router left to right against the rotation of the bit, keeping the base flat and the guide tight against the edge.
  5. Repeat with progressively deeper passes until you reach your target depth, usually two to four passes total.
  6. Check the groove with the mating piece before cutting additional grooves.

Checklist Before You Start

  • Straight bit sized to your panel thickness
  • Edge guide or clamped straightedge
  • Test scrap of the same material
  • Dust collection or a shop vacuum
  • Clamps and a flat work surface
  • Safety glasses and hearing protection

Common Mistakes and Tips

  • Cutting the full depth in one pass, which causes burning and tear-out.
  • Feeding the router too fast. Slow, steady movement gives a cleaner wall.
  • Skipping the test cut. Measure the actual thickness of your panel first.
  • Letting the guide drift. Re-check alignment after every pass.
  • Running the bit in the wrong direction, which pulls the router away from the guide.
  • Straight router bits in a set: A range of diameters lets you match common plywood and solid wood thicknesses without buying bits one at a time. View on Amazon
  • Edge guide for routers: A fence that clamps to the router base keeps the cut parallel to the edge on long runs. View on Amazon
  • Clamps for router work: Solid clamps hold the workpiece and guide firmly so nothing shifts mid-cut. View on Amazon

If you are building a larger project, you may also want to read about a Wood Router Table Combo: How to Choose and Build One Step by Step (2026) for repeated groove work. For other router techniques, see How to Router Words Into Wood: A Step-by-Step Guide for Beginners and How to Bevel Wood with a Router: 7 Best Picks Compared for 2026.

FAQ

What size router bit should I use for a groove?

Choose a straight bit whose diameter matches the thickness of the panel that will fit into the groove. Test the fit in scrap first, since plywood thickness can differ from its label.

How deep should a groove be in wood?

A depth of about one-third of the board thickness works well for most shelving and joinery. Shallower grooves are easier on the bit and the router, but they hold less.

Can I cut a groove in wood without an edge guide?

You can clamp a straightedge to the workpiece and run the router base against it. Measure the distance from the straightedge to the bit to make sure the groove lands where you planned.

Conclusion

Cutting a groove with a router comes down to the right bit, a measured depth, and steady passes against a firm guide. Test on scrap, cut in stages, and check the fit before committing to the finished piece. With those habits, your grooves will come out clean and consistent.

Ready to choose one?

Claire Whitaker

About Claire Whitaker

Claire Whitaker is part of our editorial team and reviews and edits our woodworking guides, checking product details against manufacturer specifications and owner feedback.