While CNC machining and turning systems of the past only had resolutions and least input increments equal to the displayed decimal places, new systems support more precise inputs.
While it is possible to calculate by hand adjustments to feed rate for circular milling operations, cutter radius compensation CNC programs streamline this process.
Maintaining a constant feed rate between linear and circular milling easily leads to chatter — for most applications, increase feed rate on external arcs and decrease it for internal.