What goes into laser cutting time
Laser cutting time depends on several interconnected factors that determine how long the laser head spends moving along the programmed tool path. The most significant factor is the total path length — the cumulative distance the laser must travel through the material to complete all cuts. A design with many intricate shapes, internal holes, and fine details will have a dramatically longer path length than a simple rectangular cutout of the same overall dimensions.
The second major factor is cutting speed, measured in millimeters per second. This value depends on the laser's power output, the material being cut, and the material's thickness. A 60W CO2 laser cutting 3 mm acrylic might run at 20 mm/s, but the same laser on 6 mm plywood would need to slow to 8-10 mm/s to cut cleanly through the thicker stock. Cutting too fast results in incomplete cuts (the beam does not penetrate fully), while cutting too slow wastes time, chars edges, and increases heat-affected zone width.
Pierce time adds a third component. Every time the laser begins a new closed contour or separate cut path, it must dwell momentarily to burn through the material before it can begin traversing. A design with 50 small holes requires 50 individual pierces, and at 0.5 seconds per pierce, that adds 25 seconds to the total job. This is especially significant for perforated panels, grilles, and designs with many internal features.
Setup time covers the fixed overhead per batch: loading the material onto the bed, aligning it with the origin point, setting focus height, running test cuts for unfamiliar materials, and configuring power and speed parameters in the controller software. For a well-practiced operator with a familiar material, setup might take 3-5 minutes. For a first-time material or complex multi-layer job, it can exceed 15 minutes. Understanding each of these components helps operators quote jobs accurately and identify where time savings are possible.
How to measure path length from vector files
The total path length is the single most important input for estimating cutting time, and it comes directly from your vector design file. Most vector editing programs and laser control software can report this measurement.
**In Adobe Illustrator:** Select all cut paths, open the Document Info panel (Window > Document Info), and choose "Objects" from the panel menu. The total path length appears in the summary.
**In Inkscape:** Select all paths, then use Extensions > Visualize Path > Measure Path. Alternatively, check the XML editor for the \`d\` attribute length on each path.
**In LightBurn:** The preview window (Alt+P) displays the estimated total travel distance and cut time based on your configured speed and acceleration settings.
**In CorelDRAW:** Select objects and check Properties > Curve for the path length.
If your software does not report path length directly, you can export the design as an SVG file and use an online SVG path length calculator. For simple designs, you can also estimate by multiplying the perimeter of each shape by the number of copies. A 100 mm square has a perimeter of 400 mm; ten of them give a total path of 4,000 mm.
How the calculator works
The estimator uses deterministic formulas based on the physics of laser motion:
**Cutting Time (minutes):** \`\`\` Cutting Time = Total Path Length (mm) / (Cutting Speed (mm/s) x 60) \`\`\`
**Pierce Time (minutes):** \`\`\` Pierce Time = Number of Pierces x Pierce Delay (s) / 60 \`\`\`
**Total Time per Part:** \`\`\` Time per Part = Cutting Time + Pierce Time \`\`\`
**Total Job Time:** \`\`\` Total Job Time = (Time per Part x Quantity) + Setup Time \`\`\`
**Cost Calculation:** \`\`\` Total Cost = (Total Job Time / 60) x Hourly Rate \`\`\`
The calculator applies your machine's hourly rate to the total job time (including setup) to produce the cost estimate. Setup time is applied once per batch, not per part, which means larger quantities become progressively cheaper per unit.
How to use this calculator
1. Measure the total path length from your vector file using your design software's path measurement tools, then enter it in millimeters 2. Count the number of pierces in your design — each closed shape, hole, or separate cut line requires one pierce 3. Select a material preset to auto-fill typical cutting speed and pierce delay values, or choose "Custom" to enter your own 4. Adjust the cutting speed if you know your specific machine's optimal setting for this material and thickness 5. Set the pierce delay based on your material — thin materials need less dwell time, thick or reflective materials need more 6. Enter your setup time estimate, accounting for material loading, alignment, and focusing 7. Enter your machine's hourly rate — this is whatever your shop or makerspace charges for laser time 8. Set the quantity if you are cutting multiple identical parts 9. Review the results, including the time breakdown chart that shows where the job time is spent
Tips for reducing cutting time
- **Optimize cut order:** Group nearby cuts together so the laser head travels less between shapes. Most laser software has an "optimize path" or "order by closest" feature. - **Reduce pierce count:** Combine connected shapes into continuous paths where possible. Instead of cutting 10 separate rectangles, consider a connected grid that requires fewer individual pierces. - **Use appropriate speed:** Running slightly below maximum speed often produces cleaner cuts that do not need post-processing, saving total project time. - **Nest parts efficiently:** Pack parts tightly on the sheet to minimize wasted material and reduce total travel distance between features. - **Batch similar materials:** Cut all parts of the same material and thickness in a single session to avoid repeated setup and recalibration. - **Pre-focus and template:** For repeat jobs, create a jig or template on the bed so material placement is instant. - **Simplify designs:** Round corners (which cut faster than sharp corners due to deceleration) and remove unnecessary detail from parts that will not be visible.
FAQs
Q: Does this calculator account for laser acceleration and deceleration? A: No. Real laser controllers slow down at corners and curves based on acceleration limits. This estimator uses a constant cutting speed, so actual times may be 10-20% longer for designs with many direction changes. LightBurn and RDWorks preview modes account for acceleration and give more precise time estimates for complex geometry.
Q: Why is the machine hourly rate a user input instead of a preset? A: Hourly rates vary enormously. A makerspace might charge \$15-30/hr, a small job shop \$60-150/hr, and a high-power fiber laser production facility \$200+/hr. The rate also depends on whether you are including overhead, depreciation, and maintenance or just electricity costs. Enter whatever rate makes sense for your costing model.
Q: How do I estimate pierce count for a complex design? A: Each closed shape in your vector file requires one pierce. A rectangle is 1 pierce. A rectangle with 4 bolt holes is 5 pierces (1 for the outline + 4 for the holes). In Illustrator or Inkscape, count the number of separate closed paths. In LightBurn, the cut planner shows the total number of shapes.
Q: What cutting speed should I use for a material not listed in the presets? A: Check your laser manufacturer's recommended settings for your specific machine power and material. As a starting point, run test cuts on a small area at moderate speed and adjust up or down. Most laser communities maintain speed/power charts organized by wattage and material.
Q: Does cutting speed scale linearly with laser power? A: Roughly, yes, for thin materials. Doubling the laser power typically allows you to cut at roughly double the speed through the same material thickness. However, very thick materials have diminishing returns because heat dissipation becomes the limiting factor rather than raw power.
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