🔍 Burning can happen with flush trim bits if the router speed is too high, the feed rate is too slow, or the bit is dull (or a combination of those). When you linger in one spot, the friction generates heat and can scorch the wood. To prevent burn marks: ensure your bit is sharp (dull bits rub more than cut). Next, try reducing the router’s RPM – especially on hardwood, an extremely high speed isn’t necessary for a small diameter bit. Also, keep the router moving at a consistent pace through the cut – don’t pause or move super slowly unless necessary for safety. If you’re routing endgrain or a resinous wood that burns easily (like cherry or maple), these steps help even more. Lastly, make sure the bearing is spinning freely; if the bearing seizes, the metal rubs and that can burn. A touch of light oil on the bearing occasionally keeps it happy. With a sharp, well-maintained bit and proper technique, burn marks should be minimal.

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