Laser cutting: timing and estimation

What this guide covers

In the invented flat-sheet example, 6,000 mm at 3,000 mm/min and 1,000 mm at 1,000 mm/min take 3 minutes of cutting. Add 10 pierces at 3 seconds each (0.5 minute) and 1.5 minutes of other program work for 5 minutes of program time. An 8-minute setup once per batch brings sequential resource time to 13 minutes.

Use programmed travel and pierce counts for the selected nest. Add only activities the CAM or measured duration excludes. The example covers flat sheet and uses invented inputs. Compare the complete cutting route for secondary work, thermal effects and delivered-part acceptance.

Laser-cutting concepts

For the cutting mechanism and process variables, see TRUMPF's laser-cutting reference. Use the terms below when checking what a CAM report or worksheet counts.

The laser-specific ProNest overview distinguishes process parameters by material, thickness, grade and class. It also lists feed techniques, piercing modes, rapid moves and lead parameters. ProNest laser process support, pp. 1–2

What determines a timing estimate

Process and application scope

Material grade, condition, thickness, machine configuration, gas/process and quality requirements define the applicability of process data. Thickness needs a unit such as mm or inch; a gauge designation requires its applicable convention. A broad label such as “stainless” does not establish every process parameter.

A machine manual describes its documented configuration and conditions. Installed-options records, applicable technology tables and inspection results describe different aspects of an actual application. A family brochure alone does not establish the installed setup or an accepted quality envelope.

Path selection and length

Cutting paths differ from dimensions, construction lines, bend marks and etching. Including annotation geometry can produce a numerically precise but irrelevant cutting length. Duplicate or open paths and conflicting drawing revisions introduce separate geometry ambiguities.

Length may describe design perimeter or programmed travel, with a per-part, per-sheet or per-nest basis. Layer conventions, annotated drawings, import procedures and CAM reports help distinguish those quantities. Lead travel and shared boundaries can make programmed length differ from a sum of individual part perimeters.

Estimation method and clock definition

Check the CAM postprocessor and its time inclusions, the worksheet's formulas and inputs, or the job families and operating conditions behind measured history. Record the assumptions behind an expert estimate.

Minutes of program execution, occupied resource time and total elapsed production time are different quantities. Comparing them requires the same start/end events and allocation basis. A CAM report legend, controlled spreadsheet or measurement log can establish what a number includes.

Piercing and cutting speed

Hypertherm describes common-line, chain and bridge cutting as strategies that change cutting distance or piercing demand. Software availability does not establish use on a particular machine or actual savings. ProNest optional modules: Common Line Cutting; Chain and Bridge Cutting

Use the programmed pierce count, mode and seconds per pierce, or the inclusive piercing duration. Match the feed rate and units to the material, thickness, machine and process for each cutting group.

A missing material/thickness row does not establish that the nearest row is suitable. Interpolation needs an applicable technical basis. An effective speed fitted to total elapsed time may already include delays that a process-table feed rate excludes. Adding those delays again double-counts their contribution.

Additional activity and cost allocation

Setup, loading, unloading, repositioning, handling, inspection and secondary operations can contribute time outside cutting and piercing. Their inclusion depends on the clock being measured. Concurrent activities do not necessarily add to elapsed time, even when they consume separate resources.

Setup allocated per order, batch or nest has a different per-part effect. An hourly resource rate needs its currency, denominator and included costs. A cycle duration alone establishes neither production cost nor selling price or delivery time. Rate sheets, routing examples and spreadsheet formulas can document these distinctions for a particular estimation method.

An explanatory timing model

Add cutting, piercing and other activities when each term covers separate, sequential work.

cut_minutes = sum(cut_length_mm / cutting_speed_mm_per_min)
pierce_minutes = sum(pierce_count * seconds_per_pierce) / 60
program_minutes = cut_minutes + pierce_minutes + other_program_minutes
resource_minutes = program_minutes + setup_minutes + other_resource_minutes

Record which activities are per part, sheet, nest or batch. Model concurrent work separately when estimating elapsed time. CAM durations or effective rates may already include contour-dependent motion, acceleration, retries and nesting effects.

A synthetic worked example

Suppose an example worksheet explicitly separates these sequential components:

The worksheet totals 5 minutes of program time and 13 minutes of sequential resource time. If the CAM total already includes lead travel or piercing, use it without adding those activities again.

Timing uncertainty

Record the time unit, quantity basis, machine, material, thickness, process, source revision and observation or effective date. Treat unmeasured activities as unknown.

Different scope, source versions or clock definitions can explain apparently conflicting durations. The faster number is not inherently more applicable. Standard operating cases and exceptional jobs describe different conditions and should not be pooled without a justified comparison basis.

Process suitability and acceptance limits depend on application-specific engineering evidence. Pricing exceptions and delivery commitments require additional commercial and scheduling context; neither follows from a cutting-time formula.

Sources and limits

Sources checked 27 October 2026 (PDT). All descriptions are paraphrases. Retrieval dates are not publication dates.

1. TRUMPF — Laser cutting. Undated manufacturer guidance. See “The laser cutting process” and “Parameters which influence the laser cutting process.” Supports the process explanation and parameter dependence; not a source of confirmed operating settings.
2. Hypertherm Associates — ProNest laser process support. Document 896050, Revision 4, February 2023; pp. 1–2. Describes software capabilities, not a universal timing algorithm or a guarantee of installed machine/postprocessor support.
3. Hypertherm — ProNest optional modules. Undated, mutable product documentation. See Common Line Cutting and Chain and Bridge Cutting. Multi-process guidance; laser-specific support and installed use depend on configuration.

For a production estimate, use the applicable machine process table, a validated CAM/postprocessor model or measurements from comparable jobs. Use separate engineering and commercial evidence for tolerances, capability, pricing and delivery. Tube, bevel and multi-axis cutting require their own evidence.