What counts as cutting time in a CNC cycle?

Only the minutes the cutting edge spends engaged in the material. Rapids, tool changes, probing, and load or unload are non-cutting time, even though the program spends time on them.

Why is my cutting-time share so low?

Several tools, probe checks, or long rapids can consume more time than the cut. A cycle that cuts for 6.8 minutes but runs 11.5 minutes spends 40% of its time not cutting.

What cutting-time share should a process target?

It depends on tool count and part features. A single-tool roughing cycle can exceed 80%, while multi-tool finishing with probing often sits near 50 to 60%.

How do I raise the cutting share without breaking tools?

Cut non-cutting time first: shorter rapids, fewer tool changes, offline probing, faster load and unload. Raise feed or speed only inside the tool and machine limits.

CNC Machining calculator

Cutting Time vs Non-Cutting Time Calculator

Compare the minutes the tool spends cutting with the whole cycle. Enter cutting time, total cycle time, and the share you want cutting to reach.

What this calculator does

Cutting share of the CNC cycle, with the non-cutting minutes that stand between the process and its target.

Formula used

Cutting-time share = spindle cutting time ÷ total CNC cycle time × 100
Non-cutting time = total CNC cycle time − spindle cutting time
Gap to target = target cutting-time share − cutting-time share

Inputs explained

Spindle Cutting Time: Minutes the tool spends in the material.
Total CNC Cycle Time: Whole cycle from start to the next start.
Target Cutting-Time Share: Cutting share the process should reach.

How to use the result

Best suited to improving cycle efficiency, justifying a tool-path change, benchmarking a new process.
Rapid, probe, and load moves sit inside total cycle time. A target share set without cycle data is a guess.

Current U.S. benchmarks

The producer price index for steel mill products stands at 381.162 (BLS, Aug 2026), up 23.4% from a year earlier. Quotes priced off last quarter's material cost miss this move.
The U.S. has 17,154 machine shops establishments employing about 223,303 workers (Census County Business Patterns, 2023).

Common questions

What counts as cutting time in a CNC cycle? Only the minutes the cutting edge spends engaged in the material. Rapids, tool changes, probing, and load or unload are non-cutting time, even though the program spends time on them.
Why is my cutting-time share so low? Several tools, probe checks, or long rapids can consume more time than the cut. A cycle that cuts for 6.8 minutes but runs 11.5 minutes spends 40% of its time not cutting.
What cutting-time share should a process target? It depends on tool count and part features. A single-tool roughing cycle can exceed 80%, while multi-tool finishing with probing often sits near 50 to 60%.
How do I raise the cutting share without breaking tools? Cut non-cutting time first: shorter rapids, fewer tool changes, offline probing, faster load and unload. Raise feed or speed only inside the tool and machine limits.

Last reviewed 2026-10-01.