Cut Waterjet Changeover Time Without New Hardware
Waterjet machines often lose more time during changeovers than during actual cutting. When orders are tight and capacity is fixed, those lost minutes quickly grow into missed slots on the planner, late jobs, and long days on the shop floor. Many shops feel the pressure as autumn demand builds, but the same pressure appears whenever the schedule is full and customers want shorter lead times.
Waterjet accessories can help, but most of the waste in changeovers does not sit inside the OMAX machine. It sits in how people, tools, material and programs are organised. That is good news, because it means you can improve throughput without waiting for new hardware.
SMED, Single-Minute Exchange of Dies, is a simple idea: separate what can be done while the machine is running from what must be done when it is stopped, then push as much work as possible into running time. In this article, we focus on applying SMED to waterjet changeovers using three practical methods, standard work, kitting and pre-set programs. These are all things any OMAX user can start to build into daily routines.
As the UK’s trusted OMAX waterjet partner, we see these methods working in real production cells, and we apply them in our own demonstration facility when we prove out jobs and processes for customers. They are not theory, they are shop-floor habits that save time.
Rethinking Waterjet Changeovers Through a SMED Lens
For engineers and production managers, SMED is a structured way to reduce setup time so changeovers move towards single-digit minutes. It grew up around presses, moulding and other high-changeover processes, but the thinking applies cleanly to abrasive waterjet cutting.
If we map a typical OMAX changeover, we might see steps like:
- Reviewing the new job, drawings and priorities
- Moving the previous material away and bringing new stock to the table
- Setting or swapping fixtures, stops and supports
- Checking nozzle, orifice, focusing tube and abrasive feed
- Loading the correct program and verifying parameters
- Running a trial cut if needed, then inspecting the first-off part
Every task in that list can be classed as either internal or external: the machine cannot cut while we do internal tasks, but it could be running on the previous job while we prepare external tasks. The more work we move into external time, the less we interrupt cutting, which drives better OEE and more parts out of the same cell.
Long changeovers force larger batches than the customer actually needs, increase WIP and reduce flexibility in planning. When the order book is busy towards late-summer and autumn, that lack of flexibility hurts. SMED gives a low-risk, high-return way to tidy the process before committing to extra machines or heavy investment in new accessories. It sits alongside upgrades, it does not compete with them.
Standard Work for Fast, Repeatable Changeovers
Standard work means a clear, agreed, best-known method for a task. For waterjet changeovers, it usually takes the form of step-by-step checklists, simple visual guides and standard OMAX control procedures.
A typical standard changeover sequence might look like this:
- Pre-change review, confirm material, thickness, delivery need and program version
- Material staging, bring the next sheets or plates close to the cell while cutting continues
- Fixture selection, choose stops, supports or jigs from a defined set for that job family
- Program preparation, load or confirm the correct file, check toolpath and lead-ins
- Dry-run or simulation where appropriate, use OMAX software tools to check paths
- First-off verification, measure key features, record results and sign off before full batch
To create this standard, we suggest observing your best OMAX operators doing real changeovers, timing each step and asking which actions truly add value. Often you will see walking, searching for clamps, re-typing program names or re-checking details that could be made simpler.
Standard work helps with:
- Cross-training, giving newer operators a proven routine
- Shift handovers, so changeovers are done the same way around the clock
- Seasonal peaks, where temporary or less-experienced staff may work on the cell
Our team regularly helps customers build these standards during on-site visits or at our demonstration facility, bringing in OMAX-specific best practice, such as smart maintenance checks that sit naturally inside the changeover routine rather than stopping production at random points.
Kitting Tools, Fixtures and Waterjet Accessories for Speed
Kitting means preparing everything needed for a job in one place, ready to go. In a waterjet cell this covers tools, fixtures, gauges, consumables and any relevant waterjet accessories.
Practical examples include:
- Fixture and clamp kits for common plate sizes, each with stops, clamps and bolts
- Nozzle and orifice kits, with spare parts, seal tools and cleaning items together
- Abrasive feed and focusing tube kits, including parts for quick checks or swaps
- Inspection kits for first-off checks, with gauges, callipers and simple check sheets
With kitting, many slow steps become external work. While the OMAX is cutting, an operator or support person can gather clamps, confirm abrasive levels, prepare sacrificial slats or supports and print or collect drawings. When the head stops, everything is to hand.
To make this stick, storage needs to be clear and close to the waterjet cell:
- Label shelves and bins with job families or material groups
- Use shadow boards for commonly used clamps and gauges
- Keep waterjet accessories used in changeovers within a few steps of the control
We often advise customers on kitting strategies that reflect their typical UK work, for example aerospace alloys, composites, stone or precision engineering parts. The right spare parts and accessories in the right kit reduce hunting, guessing and rework.
Pre-Set Programs, Families of Parts and Digital Standards
OMAX software and control features support the idea of pre-set programs, where proven cutting parameters and material data are stored and reused. When repeat work comes back, you are not starting from a blank screen.
Grouping components into families of parts is a powerful way to simplify this. For example:
- Standardise on a small number of material thicknesses where possible
- Use consistent datum locations on the table and in the control
- Apply common nesting strategies for similar shapes or product lines
When you build a digital standard around this, you reduce variation at the control. That might include:
- Clear naming conventions for programs and revisions
- Locked cutting parameter sets for common materials and thicknesses
- Simple rules for when a trial cut is needed and when it is not
Many programming tasks then move out of the cell. CAM preparation, nesting and parameter checks can be done on an office PC while the machine is running. The operator loads a pre-approved program for that family of parts and follows the standard work.
At our demonstration facility we help customers develop and test these libraries, using real jobs to prove cut quality before rolling standards out to the shop floor. SMED thinking fits naturally into this work: less variation in programs means less variation in changeovers.
Building a Continuous Improvement Roadmap for Your Cell
To get started, keep the plan simple and practical:
- Time several current changeovers for key product families
- Map each task as internal or external and challenge every internal step
- Create draft standard work for one family and test it with the operators
- Build basic kits for that family and store them next to the OMAX cell
- Measure the impact on downtime and update the standard from what you learn
Involving operators, planners and maintenance in a small SMED team usually brings the best ideas out. Operators see the wasted motion every day, planners understand which families matter most to delivery, and maintenance know where simple checks can prevent later stoppages.
The gains from SMED stack over time. Faster changeovers make it easier to run smaller batches, respond to short-notice orders and keep your existing OMAX machines cutting instead of waiting for setups. This supports better delivery performance and smoother use of overtime without relying only on new capital projects.
As a dedicated OMAX waterjet partner based in the UK, we see first-hand how standard work, kitting and pre-set programs transform mature cells that already have good hardware and waterjet accessories. By focusing on people, process and software as well as the machine, your waterjet cell can become a faster, more responsive part of your production flow.
Get Started With Your Project Today
Equip your system with precisely engineered waterjet accessories that help you cut more accurately, efficiently and reliably. At Aquajet, we work with you to match the right components to your application so you get consistent results and better uptime. If you are ready to discuss specifications, pricing or lead times, simply contact us and our specialists will guide you through the next steps.