Own laser or contractor: how to compare production scenarios without a false payback claim ART-432

Own laser or contractor: how to compare production scenarios without a false payback claim

An in-house laser machine and contract cutting are not two tariffs for one operation; they are two ways of organising production capacity. An internal cell gives control of queue, data and priorities, but requires equipment, people, service, materials and safe operation. A contractor reduces the amount of internal infrastructure, but adds dependence on its schedule, acceptance rules, logistics and the quality of supplied data. Compare not “currency per metre” but the same result: an accepted batch, in the required revision, with agreed quality and timing.

What question actually needs answering

The error starts when a company asks, “What is cheaper: buying a laser or ordering cutting?” There is no honest answer without describing the part mix. Define which route best meets a particular need: regular production, rapid prototypes, a seasonal peak, a critical part, a service backup or an order that does not justify creating a new cell.

Collect actual orders across several typical periods. Do not immediately reduce them to one average. Mark recurring parts, irregular items, difficult materials or geometry, peak orders and work already sent outside. This map shows whether permanent internal capacity is needed, or a main route with contract or backup support is sufficient.

Three routes to compare

| Route | Strength | What creates risk | When to test it | |---|---|---|---| | In-house laser cell | Control of queue, priorities, data and fast changes | Investment, people, service, downtime, safety and process responsibility | When a stable base load needs constant control | | Main contractor | No need to create the full internal infrastructure immediately | Contractor queue, logistics, dependence on competence and acceptance rules | For irregular batches, prototypes or temporary load | | Combined route | Internal flow combined with peaks, complex jobs or backup | Common rules for files, quality, marking and priority changes are needed | When no single route covers all demand without excess risk |

A combined model does not mean “do a little of everything”. Define in advance which parts stay inside, which go outside, what triggers the backup route and who decides on a change. Without this, two performers can make parts that differ in quality or revision.

How to assess load without an invented forecast

Use the actual production programme, not the machine’s rated speed. Available time includes file preparation, planning, material loading, sorting, service, order changes, breaks, training and unexpected stops. Lantek’s production-planning materials show the connection among orders, materials and load; a planning system does not turn a rated number into guaranteed output.

Separate load into base, peak and backup. Base load regularly creates flow. Peak load is a temporary increase or urgent order. Backup load is the ability to continue when the internal cell is busy, faulty or constrained. Each group needs its own route. Fitting the whole investment to a short peak is as risky as planning all production around a contractor without a proven backup.

Payback cannot be stated honestly without company data on volume, shifts, labour, service, financing, material, taxes, downtime and the alternative contractor price. This article gives no numerical payback period because no universal value exists. A company model is needed in which every assumption is visible and changeable.

What belongs in the full cost of an in-house cell

The internal route includes more than the machine. Initial costs may include delivery, installation, site preparation, required power and gas systems, training, software, measurement tools and commissioning. Fixed costs include people, premises, planned maintenance, spares, records, safety and technology support. Variable costs include sheet, gas, electricity, nozzles, protective items, sorting, scrap and internal logistics.

Show unavailability risk as a separate line. If a machine stops, the consequence may include delaying bending, welding, assembly or shipment, not only repair. HSE stresses that maintenance of work equipment must be planned and done by competent people. In comparison terms, a service window and backup parts cannot be hidden in a note or treated as zero.

What belongs in the contractor comparison

Bring the contract quotation to the same result used for the internal cell. Clarify whether it includes file review, nesting, material, sorting, marking, packing, delivery, inspection, correction of a revision error and transfer of scrap. Record when lead time starts: after files arrive, material is agreed or the order is confirmed.

Assess a contractor by more than price. HSE guidance on using contractors recommends defining the work in advance, checking competence, assessing risks, transferring necessary information and supervising delivery. For laser cutting, that means checking experience with the required materials and geometry, revision procedure, responsibility for nonconformity, packing and communication channel.

Request a small representative test batch. It should include not only simple contours but also parts for subsequent bending, welding or assembly. A test does not prove that all parts can be made, but it shows whether the parties interpret drawings, quality and handover in the same way.

Four questions for the production scenario

Before calculating, answer four questions. First: what must the company control every day—a critical part, order queue, urgent prototypes or the whole route from file to blank? Second: which work repeats and which appears only at a peak? Third: what happens if the in-house machine or main contractor is temporarily unavailable? Fourth: who may change the route when time or quality is at risk?

These questions prevent confusing technological independence with owning a machine. Internal equipment may matter for a critical part but be excessive for a rare simple contour. A contractor can be useful for serial work but a poor backup if its queue is long or it cannot accept urgent changes. Build the decision from the production consequence.

Contrasting scenarios for testing the decision

Stable-base scenario. The company regularly makes the same enclosures or brackets, has approved files and plans subsequent operations. An in-house cell may control sequence and priority changes. But verify the responsible operator, technology support, maintenance plan and a backup route for downtime.

Variable-mix scenario. Orders arrive unevenly, materials and geometry change, and some parts are urgent. A completely internal model can become hard to plan. A contract or combined scheme can separate normal flow from unusual items only if the contractor works with current files and agreed acceptance criteria.

Peak scenario. The main volume can be made internally, but a large batch or short-lead order appears periodically. Do not automatically buy equipment for that peak. First establish whether it repeats, whether the batch can be spread and whether a proven external route exists. A peak scenario belongs as a separate planning line, not as a hidden reason to oversize the entire configuration.

Backup scenario. The in-house laser may be busy, under maintenance or unable to obtain material. A contractor can be backup only if checked before the event: send a control part mix, agree the data format, receive a sample and record limitations. An untested backup is only an assumption.

Compare controllability as well as price

Two routes may cost roughly the same but provide different control. For an in-house cell, establish who approves the file, changes the queue, accepts the part and owns downtime. For a contractor, establish how receipt is confirmed, whether file nonconformity is reported, how batches are marked and what happens when revision changes.

Controllability does not mean everything must be made internally. It means each handoff has an owner, a recorded event and a clear result. If a contractor makes parts, the company still approves drawing, material and acceptance criterion. If an internal cell operates, the team must not replace engineering control with unstructured “we always do it this way”.

How to test a backup without an emergency launch

Begin with a short scenario description: which part group can be transferred, file format, required material information, expected inspection and result acceptor. Then send several different items rather than one simplest contour. Record response time, number of clarifications, process changes and the condition of the received set.

After the test, record what the backup proved and what remains unknown. For example, it may suit sheet steel but be untested for thin sheet, subsequent bending or a particular edge requirement. Do not call this route universal. Its limits must be available to the person who decides during actual load.

Create the same route card for every route: responsible person, file-transfer channel, material requirements, quality criterion, result unit, confirmation process and action for nonconformity. On a drawing change, the card must show who stops the previous revision and approves the new one. On a date change, record the reason—queue, material, logistics or technical clarification. This discipline matters especially for backup because urgent situations tempt participants to skip checks.

Backup route: when it really works

Backup is not a list of random suppliers or a telephone number on a website. Define critical parts, transferred data, who approves substitution, how quality is checked and which event activates the route. Backup may be needed because of in-house machine service, the main contractor’s load, unusual material, an urgent order or temporary operator absence.

Test backup in a calm period, not only during an emergency. Send several parts with control requirements, assess the real communication cycle, receive samples and record limits. Do not promise a customer a date until the backup performer has confirmed its capabilities for that batch.

Practical decision algorithm

1. Select real part mix and the same comparison period. 2. Divide it into base load, peak, complex tasks and backup. 3. Record material, quantity, file revision, quality, sorting, packing and date. 4. For an in-house cell, include initial, fixed and variable cost, service and downtime risk. 5. For the contractor, obtain an itemised quotation with included and excluded work. 6. Bring both routes to the same result and comparison unit. 7. Check competence, communication quality and availability of main and backup performers. 8. Run a limited representative-batch test. 9. Record the decision, open assumptions, route-change conditions and responsible people.

Typical mistakes

• dividing a machine price by rated hours and calling it unit cost;
• comparing machine time with a contractor price that already includes work, inspection and delivery;
• planning internal equipment for a short peak without testing base flow;
• treating a contractor as backup without a test, confirmed competence and agreed lead time;
• omitting people, service, spares, safety and downtime from the in-house cell;
• failing to record drawing revision, material and acceptance criteria;
• calculating payback from one average figure with invisible assumptions;
• assuming a machine’s presence automatically means technological competence;
• assigning unsafe or unagreed tasks to unprepared people.

Comparison checklist

• [ ] A real part mix and period are selected.
• [ ] Base, peak and backup loads are identified separately.
• [ ] Material, file, quantity, quality and timing are equally described for both routes.
• [ ] The in-house model includes people, service, spares, safety and downtime.
• [ ] The contractor quotation separates included and excluded work.
• [ ] Contractor competence and actual availability are checked.
• [ ] The process for nonconformity and revision change is agreed.
• [ ] A backup route has been tested.
• [ ] No payback period is asserted without company data.
• [ ] Open assumptions and decision owners are recorded separately.

What cannot be determined without data

Without actual part mix, quantity, materials, schedule, quality requirements, labour cost, service resource, site conditions and a specific contractor quotation, it is not possible honestly to say whether an in-house laser or outsourcing will be cheaper. A payback period cannot be determined from one machine price, rated speed or price per metre. Nor can it be guaranteed that a backup contractor will accept any part within the required time without testing its capability.

Conclusion

An in-house laser machine makes sense not because it is “always cheaper”, but where the company needs permanently controlled capacity and can provide load, people, service and safety. A contractor makes sense not because “there is no need to invest”, but where its competence, quality, lead time and logistics suit the actual flow. In many cases the most resilient solution is division: recurring base tasks in-house, peaks or selected scenarios to a contractor, and critical routes with proven backup.

Make the decision on the same part mix, in a visible period, using common result criteria and no invented payback period. First, several real items can be sent for a comparative estimate: this shows which data still needs confirmation and provides a basis for the next technical and commercial decision.

Send data for a quotation