Calculate optimal router bit speeds
Smaller bits = higher speeds
Larger bits = lower speeds
1/4" bit: 16,000-22,000 RPM
1/2" bit: 11,000-16,000 RPM
3/4" bit: 8,000-12,000 RPM
1" bit: 6,000-11,000 RPM
Always err on the slower side for hard materials and deep cuts.