Router Bit Speed Calculator
Maximum Safe RPM
Calculate maximum safe RPM based on bit diameter
Formula
Surface Speed = RPM x Pi x Diameter / 12 | Chip Load = Feed Rate / (RPM x Flutes)
Frequently Asked Questions
Why does bit diameter affect speed?
Larger bits have higher rim speed at the same RPM. Excessive rim speed causes burning, poor cut quality, and safety hazards. Always reduce RPM for larger bits.
What is a safe feed rate for routing?
Feed rate depends on RPM, bit diameter, and number of flutes. Generally aim for a chip load of 0.003-0.005 inches per tooth for clean cuts without burning.
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