Always refer to the operation manual of your router first, in the event that a router bit doesn't come with a speed chart, you may start at about 2,000 rpm slower than the maximum speed described in the chart below. Maximum speed below is for reference only, actual best performance speed varies depending on a number of factors i.e. size of the router bit, the material to be cut, etc. Run 24,000 rpm maximum for 1" overall diameter router bits;
Run 20,000 rpm maximum for 1-1/2" overall diameter router bits;
Run 18,000 rpm maximum for 2" overall diameter;
Run 16,000 rpm maximum for 2-1/2" overall diameter router bits;
Run 12,000 rpm maximum for 3" overall diameter router bits;
Run 10,000 rpm maximum for 3-1/2" overall diameter router bits;
A up-cut spiral bit is used where an upward chip removal and a good finish on bottom are required. When using an up-cut spiral bit, chip removal is optimized but adequate hold down is also needed. A single flute bit has a faster cut speed than a multiple flute bit and should be used where cut speed is more important than cut finish. Though a single flute bit has a rougher cut than a multiple flute bit, it allows for faster chip clearance and maximum stock removal. Single flute bits are typically more suitable for being used on lower horsepower router.
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