It is important to understand that the rotational speed of a spinning object, a drill bit, a skill saw blade, a router bit, stays the same when the tool is on. It spins at a certain number of rotations or revolutions per minute. But the outside edge of the cutting piece, the blade or the bit goes faster as the size of that piece increases. That is important considering how different woods react to temperature.
The formula for calculating the speed of the outside edge is:
Cutter RMP X cutter diameter X pi (3.14) = cutter distance per minute
Notice that your answer will be in "inches per minute". You can divide that number by 60 to get inches per second.
Notice that D (diameter) X pi or 2R (radiuses) X pi is what we use to calculate circumference (outside edge) of circles.
Exercise: Outside edge speed exercise complete the chart
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