#### CNC Machining Cycle Time Calculation | All You Need to Know

WEBNov 3, 2021 · Similar to calculating other times, the general formula for CNC machining is distance or length divided by rate or speed. When it comes to machining time calculation, the formula is as follows: Machining Time = Length of Cut (mm) / Feed (mm per revolution) x Revolutions Per Minute. Revolutions Per Minute = 1,000 x Cutting Speed (mm per .