Is it better to use a slower router speed for large surfacing bits?

🔍 Generally, yes. Large diameter bits (like 2–3\" surfacing cutters) should run at a **lower RPM** than small bits. Spinning a big bit too fast can cause burning or excessive router strain. Many woodworkers dial down their router to maybe 10,000–12,000 RPM (or the lowest setting on a typical variable-speed router) for a 2-3\" bit. This slower speed, combined with a steady feed, prevents overheating and gives a cleaner cut. Always follow the bit manufacturer’s recommendations if given. The SpeTool surfacing bits don’t specify an exact speed, but a rule of thumb: bigger bit = slower speed. So yes, if your router is screaming at 20,000 RPM with a surfacing bit, slow it down if you can – you’ll get a better result and your router will thank you.

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