Claire WhitakerBy Claire Whitaker

Updated November 2026

To router groove in wood, you set a straight bit to the depth of your groove, clamp a guide to the workpiece, and make the cut in two or more passes. The result is a clean, straight channel that holds a shelf, a panel or a drawer bottom snugly. This guide covers the bit, setup and technique so you can cut consistent grooves on the first try.

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 sit in the groove, usually 1/4 inch for 1/4-inch plywood or 3/4 inch for a 3/4-inch shelf. A plunge router or a fixed-base router with a fence works well. If you are still learning how to set up the machine, How to Set Up a Wood Router: A Step-by-Step Guide for Beginners walks through the basics.

Shopping for one? See our guide: 5 Best Wood Router Prices: How Much Is a Wood Router? 5 Picks Compared.

Keep the bit sharp and seated at least 3/4 inch in the collet. A loose or short bit chatters and leaves a rough floor.

Set the Depth and Guide Edge

Set the cutting depth to about one-third to one-half of the stock thickness for a single pass. Hardwood groove depths are typically 1/4 inch or less for shelving, though your project plan will specify the exact number. Clamp a straight guide or your router’s fence to the board so the bit cuts exactly where you want the groove.

  1. Mark the groove centerline and both edges with a pencil.
  2. Measure the distance from the bit to the fence edge and adjust the guide to line up with your marks.
  3. Test the depth on a scrap piece of the same species and thickness.
  4. Confirm the test groove fits the mating piece before you cut the real stock.

Make the Groove in Multiple Passes

Deep grooves cut in one pass strain the motor and tear out the walls. Make a first pass at half depth, then a final pass at full depth. Feed the router left to right against the rotation of the bit, moving at a steady pace so the bit never stalls. A groove wider than the bit needs extra passes offset by the bit radius, or a larger bit.

For cleaner edges on the walls, a climb pass taken lightly can reduce tear-out, but use it carefully since climb cutting can pull the router forward. If you want a different approach entirely, How to Cut Grooves in Wood with a Router: A Step-by-Step Guide shows alternate setups.

How to Router Grooves in Wood Without a Table

A handheld router with a straight edge clamped to the work handles most jobs. Use a sacrificial board underneath to protect your bench and prevent the bit from marring the surface below. For narrow pieces that are hard to clamp, How to Use a Handheld Wood Router: A Step-by-Step Guide for Beginners covers safe handling and control.

Common Mistakes

  • Cutting full depth in one pass, which causes burning and wandering.
  • Forgetting to account for bit diameter when measuring the guide offset.
  • Skipping a test cut, so a groove comes out too tight or too loose.
  • Feeding too fast, leaving a rough, chattered floor.
  • Cutting with a dull bit, which tears fibers instead of slicing them.
  • Straight router bit: A quality straight bit with a shank that fits your collet gives a flat-bottomed groove. View on Amazon
  • Straight edge guide: A clamp-on guide keeps the cut parallel to the edge. View on Amazon
  • Clamps: Solid clamps hold the guide and workpiece without shifting mid-cut. View on Amazon

FAQ

How deep should a groove be for plywood shelves?

A groove about one-third the thickness of the shelf is a common starting point. Always check your project plan, since the depth affects the strength of the joint.

Can I router a groove without a fence?

Yes, a clamped straight edge works well. Measure the offset between the bit and the router base so the guide lines up exactly with your marks.

Why does my groove have rough edges?

Rough edges usually come from a dull bit, feeding too fast, or cutting full depth in one pass. Sharpen or replace the bit and take lighter passes.

Conclusion

To router groove in wood reliably, pick a sharp straight bit, set the depth and guide carefully, and cut in multiple passes. Test on scrap first so the fit is right on the real piece. With those habits, your grooves will come out clean and consistent.

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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.