A laser cutting gas mixer ROI model is credible only when it starts with the current process and accepted production data. Brochure speed, maximum machine power, or a single demonstration cut cannot establish annual profit.
Separate capacity from realized value
A shorter cutting cycle creates potential capacity. It creates financial value only when there is demand, machine availability, material flow, and downstream capacity to use it.
1. Define the Baseline
Use one representative job and record the laser, material grade, thickness, geometry, nozzle, assist gas, pressure, flow, focus, piercing strategy, cycle time, accepted quantity, rejects, and finishing work. Repeat the measurement across the jobs that represent most annual production.
2. Measure the Mixed-Gas Trial
Run the same jobs with the proposed mixed-gas process. Record the final accepted parameters, nitrogen and oxygen use, total cycle time, accepted quantity, rejects, finishing labor, and any effect on loading or downstream operations.
3. Calculate Verified Operating-Cost Difference
| Cost input | How to measure | Common error |
|---|---|---|
| N₂ and O₂ | Consumption per accepted part × invoiced unit price | Using hourly flow without gas-on time |
| Electricity | Measured kWh for all required supply equipment | Comparing nameplate power only |
| Finishing labor | Minutes per accepted part × loaded labor rate | Assuming all grinding disappears |
| Maintenance | Documented service, consumables, and downtime | Ignoring auxiliary equipment |
| Rejects | Rejected material and lost machine time | Counting gross output as saleable output |
Verified monthly operating benefit equals the baseline accepted-part cost minus the trial accepted-part cost, multiplied by the production volume that can realistically move to the new process.
4. Value Additional Capacity Carefully
Use complete cycle time rather than straight-line cutting speed. Include piercing, corners, traversing, loading, unloading, nesting, inspection, and downstream constraints. Count incremental margin only for demand that can be served and collected; do not treat every theoretical extra meter as profit.
5. Calculate Payback and Sensitivity
Simple payback equals installed equipment cost divided by verified monthly benefit. Run at least three scenarios for utilization, product mix, local gas price, and finishing-labor effect. State which inputs are measured, quoted, or assumed.
| Scenario | Utilization | Process mix | Purpose |
|---|---|---|---|
| Conservative | Below current average | Only validated jobs | Tests downside protection |
| Base | Current measured average | Expected validated jobs | Supports the purchasing case |
| Capacity case | Higher but achievable | Validated jobs with confirmed demand | Shows upside without treating it as guaranteed |
Decision Rule
Proceed when representative trials meet the part specification, the compatibility review is complete, the installed scope is defined, and the conservative scenario meets the company's investment threshold. If any of those inputs is missing, treat the ROI as preliminary.
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Use the ROI input guide or send us your measured baseline, representative jobs, gas invoices, finishing time, utilization, and proposed installation scope.
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