When to Replace a Router Bit: 6 Signs of Wear

A worn router bit does not just cut worse — it can scrap a whole batch. Watch for these six signs and replace before damage spreads.

6 signs your router bit is worn

What to do

Replace or resharpen at the first quality drop. Keep the shank tight in a clean ER collet — runout from a worn collet mimics a worn bit. For metal work, watch the coating on the TiAlN ball-nose cutter; once it is gone, finish suffers.

Stock smart

Hold spares of your top profiles — the 12 mm straight bit, 3-flute straight bit and a dovetail set — so a worn edge never stops a job. Carbide and PCD last far longer than HSS, but they still wear; plan the swap, don’t react to scrap.

Frequently Asked Questions

Q: What are the first signs a router bit is worn?

A: Burn marks on the cut, tear-out or fuzzy edges, chatter or vibration, a visibly dull or chipped edge, and a drop in feed speed or cut quality. Any of these means it is time to replace or sharpen.

Q: How often should router bits be replaced?

A: It depends on material and volume. Carbide and PCD outlast HSS many times; PCD on MDF can run for thousands of meters. Replace when quality drops, not on a fixed calendar.

Q: Can router bits be sharpened?

A: TCT and solid-carbide bits can be resharpened a few times; PCD is reground by specialists. Once the edge is gone or the bit burns wood, resharpen or replace.

Q: Why keep spare bits?

A: A worn bit ruins a whole batch and costs downtime. Keep spares of your high-use profiles — such as the 3-flute straight bit and ball-nose metal cutter — so a changeover takes seconds.