Calculate net cutting time, total cycle time, hourly and per-shift production, and the true cost per part including tooling for turning, milling and drilling operations. Scrap rate and shift efficiency are taken into account.
1. Select the operation type
Turning parameters
Production data and auxiliary times
Cost data (in your currency)
Tool cost (optional)
What is CNC cycle time?
CNC cycle time is the total time from loading a part onto the machine until machining is complete. Besides net cutting time, rapid moves, tool changes, part loading, measurement and operator interventions are all part of the total cycle time. Costing based on net cutting time alone understates the true production cost.
How is CNC cost per part calculated?
CNC cost per part is made up of the machine hourly rate, operator cost, cycle time, cutting tool consumption, raw material, energy and general production overheads. To prepare a sound quotation, all auxiliary times spent during production must be included, not just the cutting time.
Why do theoretical and actual production differ?
The calculated hourly production shows theoretical capacity. Tool wear, measurement, cleaning, unplanned stops, material waiting and operator interventions reduce the actual output. That is why a shift efficiency percentage should be used in the calculator. To compare the cost of two different cutting tools against each other, see the Cutting Tool ROI and Efficiency Calculator.
Formulas used
Spindle speed: n = (Vc × 1000) ÷ (π × D) · Turning feed rate: Vf = f × n · Milling table feed: Vf = fz × n × z · Cutting time: Tc = (L × passes) ÷ Vf · Total cycle: Tcycle = Tc + auxiliary times · Hourly production: 60 ÷ Tcycle · Cost incl. scrap: M ÷ (1 − scrap/100)