Programming time

Programming time is the time a CNC programmer spends preparing the CAM program: choosing the tool path strategy, selecting tools, setting cutting parameters and simulating the result, before the machine ever runs the part. On a one-off or first-of-a-kind part it can be a substantial share of total cost; on a repeat order it is largely already done.

How programming time behaves like setup time

Programming time falls once per part design, not per piece, similar in that respect to setup time. See setup time and run time and pre-calculation.

Where programming time is spent

Not on the drawing; it is work preparation and CAM effort that happens before production, driven by the complexity of the required tool paths and the number of distinct operations.

Common mistakes

Forgetting programming time on a complex, one-off contoured part, where it can outweigh the machine time itself. Also charging full programming time again on an unchanged repeat order, where the program already exists.

Is programming time part of cycle time?

No; cycle time is the per-piece machine time, programming time is preparation effort that happens beforehand, usually once per part design.

Why is programming time cheaper on a repeat order?

Because the program, tool paths and simulation already exist from the first order.

Does a more complex part always mean more programming time?

Usually yes, since more distinct operations and tighter tolerances typically require more tool path strategies and verification.