Today’s Mechanical Engineering Challenges: What Australia’s Major Projects Tell Us About the Future of Engineering
Mechanical engineering in 2026 is being shaped by a very different set of challenges from those that defined the profession several decades ago.
The traditional fundamentals remain essential. Mechanical engineers still need to understand loads, materials, fatigue, vibration, fluids, heat transfer, machine design, manufacturing, tolerances and maintainability.
What has changed is the environment in which those fundamentals are applied.
Today’s engineer is increasingly working inside complex systems where mechanical equipment must integrate with existing structures, electrical systems, control systems, digital models, construction tolerances, operational requirements and strict shutdown windows.
Large Australian projects such as Snowy 2.0, Western Sydney International Airport, the proposed Olympic Dam smelter and refinery expansion, the Scarborough Energy Project and Olympic Dam’s underground materials-handling developments illustrate many of these challenges.
They also demonstrate why modern mechanical engineering is moving beyond conventional drafting toward a broader digital-engineering workflow involving:
Reality Capture → Engineering Interpretation → 3D CAD → Analysis → Design → Constructability → Installation → Verification
For mechanical engineers and mechanical drafting professionals, the important question is no longer simply:
Can we design the component?
Increasingly, the question is:
Can we understand the existing environment accurately, design something that works within it, manufacture it, physically install it, maintain it and prove that the completed installation matches the engineering intent?
That is one of the defining challenges of contemporary mechanical engineering.
1. Mechanical Engineering Is Increasingly an Interface Problem
Many engineering failures do not occur because an engineer cannot calculate the diameter of a shaft or determine the stress in a plate.
Problems often develop at the interfaces.
A new machine has to connect to an existing conveyor.
A replacement pump needs to line up with pipework installed 20 years earlier.
A structural platform interferes with a maintenance route.
A new duct runs through the intended location of a lifting beam.
A prefabricated process module arrives on site and does not align perfectly with the infrastructure to which it must connect.
These are fundamentally mechanical-engineering problems, but they are also geometric and information-management problems.
A modern engineer might therefore need to consider simultaneously:
equipment geometry;
structural interfaces;
pipework;
maintenance access;
lifting and rigging;
electrical infrastructure;
operator access;
safety requirements;
fabrication tolerances;
installation tolerances;
construction sequencing;
shutdown duration; and
future maintainability.
This is where the value of reliable existing-condition information becomes increasingly important.
For greenfield projects, engineers can largely work from coordinated design models.
For brownfield engineering, however, the physical plant itself becomes an important engineering input.
2. Snowy 2.0: The Challenge of Mechanical Engineering Almost One Kilometre Underground
Snowy 2.0 is one of the clearest examples of the scale mechanical engineers are now being asked to manage.
The pumped-hydro project will connect Tantangara and Talbingo reservoirs through approximately 27 kilometres of tunnels, with a new power station located approximately 800 metres underground. Snowy Hydro reported in 2026 that construction had passed 70% completion and that attention at Lobs Hole was progressively shifting from major excavation toward preparation for the complex underground power-station fitout.
The underground station will eventually contain six generating units and enormous associated mechanical systems.
From a mechanical-engineering perspective, this creates challenges far beyond designing an individual turbine.
Excavated Geometry Is Not Perfect CAD Geometry
An underground cavern begins as geological reality.
Even with highly controlled excavation, the final physical geometry will not necessarily correspond perfectly with its nominal design surfaces.
That creates an important engineering question:
Where exactly is the physical boundary within which the mechanical installation must occur?
For relatively small equipment, several millimetres may not matter.
For large turbines, pressure waterways, valves, pipe assemblies, transformers, cranes and access structures, cumulative geometric differences can become important.
As the project moves from excavation toward fitout, engineers increasingly need confidence in:
wall positions;
floor elevations;
embedded items;
penetrations;
support locations;
equipment foundations;
interfaces between concrete and steelwork;
lifting clearances; and
installation envelopes.
This is a good example of where modern reality capture can complement traditional survey and engineering control.
The objective is not simply to produce an attractive point cloud.
The objective is to answer:
What has actually been constructed, and does the equipment we intend to install fit within it?
Heavy Equipment Creates a Second Problem: Installation
The mechanical engineer also has to think about how equipment reaches its final position.
A 3D CAD model may demonstrate that a component fits perfectly once installed.
That does not necessarily prove that it can physically be installed.
Mechanical engineers need to consider:
delivery route → temporary support → crane or lifting system → lifting orientation → rotation → final positioning → alignment → connection.
A component may fit when horizontal but not fit through the installation route.
A valve may fit within the pipe system but leave insufficient room for removal.
A motor may be accessible when new but impossible to remove once surrounding services are installed.
This is why constructability analysis is becoming increasingly important.
Modern CAD and reality-capture information can allow engineers to model not just the final location of the equipment, but also the path required to get it there.
Maintenance Must Be Designed Before Operation Begins
Another major issue is lifecycle engineering.
Large infrastructure may operate for many decades.
During that time:
bearings will require replacement;
seals will wear;
motors may fail;
valves will require servicing;
turbines will undergo major maintenance;
pipework may need modification;
instruments will be replaced.
The original design therefore needs to consider future disassembly.
Mechanical engineering should ask:
What happens 20 years from now when this component has to come out?
That requires maintenance envelopes, lifting routes and disassembly sequences to be considered during design.
This is becoming increasingly important across modern infrastructure.
3. Western Sydney International Airport: From Construction Project to Operating Asset
Western Sydney International Airport provides a different engineering lesson.
The airport commenced cargo operations in July 2026, with passenger services scheduled to commence on 25 October 2026. It is designed as a 24-hour domestic, international and cargo airport.
Once a major facility enters operation, the engineering challenge changes.
During construction, engineers largely ask:
How do we build the system?
During operations, the question becomes:
How do we modify, maintain or replace the system without disrupting the facility?
That is a fundamentally different type of mechanical engineering.
Airports Are Mechanical Systems Hidden Inside Buildings
An airport may appear primarily architectural, but behind the passenger-facing environment is an enormous amount of mechanical infrastructure.
Systems can include:
baggage conveyors;
sortation equipment;
HVAC;
pumps;
fans;
fire systems;
hydraulic equipment;
lifts and escalators;
maintenance workshops;
passenger boarding bridges;
cargo-handling systems;
utility services;
plant rooms;
fuel-related infrastructure;
access platforms; and
mechanical services.
Once the facility is operating, those systems progressively require maintenance and modification.
The Brownfield Problem Begins Almost Immediately
Every new facility eventually becomes a brownfield facility.
A piece of equipment will eventually become obsolete.
Production requirements change.
A new airline or cargo tenant may need different infrastructure.
A maintenance issue may require an equipment redesign.
New technology may be introduced.
At that point engineers need accurate knowledge of the installed environment.
Consider a relatively simple future example.
A conveyor drive needs replacement.
The replacement motor may be slightly larger.
The engineer now has to determine:
Does it fit?
Will the shaft alignment work?
Does the guarding still comply?
Is there enough room to remove the motor?
Can a lifting device access it?
Is existing structural steel adequate?
Is electrical equipment in the way?
Does nearby ductwork prevent maintenance?
Can installation occur during the available shutdown?
The engineering problem suddenly involves far more than the motor.
It involves the surrounding system.
4. Olympic Dam: Brownfield Engineering at Industrial Scale
For industrial mechanical engineers, Olympic Dam represents one of the most relevant examples.
BHP is considering a major expansion of its South Australian copper processing system. The proposed first phase would involve upgrading the existing Olympic Dam smelter to a two-stage configuration and extending refinery facilities, with the pathway intended to support copper production above 500,000 tonnes per year in South Australia. A final investment decision on the first phase has been scheduled for the first half of FY27.
At the same time, Olympic Dam remains an operating mine, smelter and refinery. BHP reported a 20-year copper production record from Olympic Dam in FY26.
This creates one of mechanical engineering’s most difficult situations:
How do you substantially modify a large industrial facility while the surrounding operation continues to produce?
Existing Drawings Are Not Always Existing Reality
Brownfield facilities accumulate history.
During decades of operation:
equipment is replaced;
pipework is rerouted;
structures are strengthened;
platforms are modified;
cable trays are added;
temporary works sometimes become permanent;
pumps change;
chutes are repaired;
guards are altered;
maintenance crews make practical improvements.
The resulting physical plant can differ substantially from the original drawings.
That creates risk when new designs are based on outdated information.
A mechanical engineer might design a new chute against a historical GA drawing.
On installation day, the contractor discovers a pipe now crosses the proposed chute wall.
Technically, the chute design may be correct.
Practically, the installation fails.
This distinction matters.
Congestion Is One of Brownfield Engineering’s Biggest Problems
Industrial plants tend to become progressively more congested.
Mechanical engineers work around:
pipework + steelwork + platforms + ladders + conveyors + instrumentation + electrical cable + ventilation + process equipment.
There may be very little unused space.
This means accurate 3D understanding is increasingly valuable before detailed mechanical design begins.
A terrestrial LiDAR scan can provide millions of measured points describing the actual geometry of the plant.
Those measurements can then support a point-cloud-to-CAD workflow.
The point cloud does not replace engineering.
It improves the information on which the engineering decision is based.
5. Chutes, Conveyors and Transfer Stations: Geometry Is Only Part of the Problem
Materials handling demonstrates this particularly well.
A transfer chute must fit physically between upstream and downstream equipment.
But its performance also depends upon:
material trajectory;
tonnage;
bulk density;
lump size;
velocity;
moisture;
impact;
abrasion;
buildup;
liner design;
access;
replacement strategy; and
surrounding structure.
The mechanical designer therefore needs to solve several problems simultaneously.
A geometrically perfect chute may still be a poor design if:
liners cannot be removed;
inspection hatches are inaccessible;
the chute cannot be lifted into place;
a flange cannot be bolted;
structural members prevent installation;
material impacts one wall too aggressively;
wear is concentrated;
blockage occurs at the outlet.
This is why practical mechanical engineering needs more than CAD proficiency.
6. Olympic Dam Underground: Materials Handling and Maintainability
BHP is also investing in Olympic Dam’s underground infrastructure.
The underground electric rail network is being extended from approximately 4.85 kilometres to more than 6 kilometres, with additional locomotives, while an ore-pass capacity project is intended to improve materials handling in the Southern Mine Area and reduce reliance on truck haulage.
Underground materials handling presents some particularly difficult engineering constraints.
Space is restricted.
Access is difficult.
Equipment is exposed to harsh operating conditions.
Shutdowns are expensive.
Components may weigh tonnes.
Maintenance logistics matter enormously.
A Machine Is Only Maintainable If It Can Be Removed
Consider an underground gearbox.
The gearbox may fit perfectly on its base.
The engineer still needs to ask:
Where does the lifting beam go?
What is the centre of gravity?
Can the coupling be removed?
Can maintenance personnel access the bolts?
Can the gearbox clear nearby steelwork?
Can it rotate during removal?
Can it be transferred onto a trolley?
Can the trolley reach a transport vehicle?
Does another service obstruct the route?
This is where an experienced mechanical engineer thinks beyond the drawing.
Maintenance is not something that happens after engineering.
Maintainability is an engineering requirement.
7. Scarborough and Pluto Train 2: The Challenge of Connecting New Plant to Existing Plant
The Scarborough Energy Project provides another important example.
As of August 2026, Woodside reports the project is more than 98% complete, excluding Pluto Train 1 modifications, and is targeting its first LNG cargo in Q4 2026. The project includes the Scarborough offshore field, a floating production unit, an approximately 430-kilometre pipeline, Pluto Train 2 and modifications to the existing Pluto Train 1 facility.
This type of project demonstrates the importance of interface engineering.
A large part of the engineering challenge lies where:
new plant meets existing plant.
Modular Construction Demands Dimensional Control
Large process plants increasingly use modular fabrication.
Rather than fabricating everything in the final location, major assemblies can be manufactured elsewhere, transported to site and connected.
That offers substantial advantages.
However, it introduces another engineering requirement:
The interfaces have to match.
A pipe spool manufactured thousands of kilometres away must ultimately connect to its mating flange.
A structural module must align with its foundations.
Platforms must meet.
Cable penetrations need to correspond.
Pipe rack interfaces have to work.
Small discrepancies can produce expensive field modifications.
This is one reason dimensional verification is becoming increasingly important.
Design Model Versus Actual Installation
Traditionally the engineering process might be thought of as:
Design → Fabricate → Install
A more robust digital engineering process is:
Design
↓
Fabricate
↓
Measure
↓
Compare
↓
Correct if required
↓
Install
↓
Measure again
↓
Verify
The result is effectively a closed engineering loop.
8. Mechanical Drafting Is Becoming Digital Engineering
These large projects also tell us something important about the future of mechanical drafting.
Drafting remains essential.
Fabricators still require:
general arrangements;
sections;
elevations;
fabrication details;
welding information;
dimensions;
tolerances;
bills of materials;
installation drawings.
But the drawing increasingly sits at the end of a much larger process.
The modern workflow can begin with:
3D LiDAR → Point Cloud → Existing Condition → 3D CAD → Engineering Analysis → Design → Drawing
The mechanical drafting professional therefore becomes more valuable when they understand the engineering problem surrounding the drawing.
9. AI Will Accelerate Design, but It Will Not Define the Engineering Problem for Us
Artificial intelligence and generative design are also beginning to change mechanical engineering.
Future software may generate hundreds of possible mechanical arrangements.
That is powerful.
But AI still needs constraints.
For example, an automated system could potentially generate 200 chute geometries.
The engineer still needs to define:
capacity;
material properties;
inlet trajectory;
outlet requirements;
allowable footprint;
wear constraints;
fabrication requirements;
structural limitations;
inspection access;
maintenance clearances.
The quality of the answer therefore depends heavily upon the quality of the engineering question.
This may be one of the most important future roles of the mechanical engineer:
Defining the correct constraints.
10. The Difference Between a CAD Operator and an Engineer-Led Designer
Modern software can produce geometry quickly.
That makes it increasingly important to distinguish between drawing production and engineering design.
A CAD operator may be asked:
“Draw this bracket.”
An engineer asks:
“Why is the bracket failing?”
The next questions may include:
What is the actual load?
Is the load cyclic?
Is fatigue involved?
Is the support deflecting?
Is there vibration?
Is the material appropriate?
Is the weld detail creating a stress concentration?
Is installation inducing load?
Can the existing structure carry the revised bracket?
Only after those questions are considered should the geometry be finalised.
The same principle applies to plant modifications.
The value is not simply in drawing what someone requests.
The greater value lies in understanding what should actually be designed.
11. The Tradesman’s Eye Still Matters
One of the most interesting consequences of increasingly sophisticated digital technology is that practical field experience may become more valuable rather than less.
A point cloud contains measurements.
It does not automatically understand:
why a handrail has been cut;
why a chute liner is worn on one side;
why a gearbox base has shims;
why an operator avoids a particular access route;
why a pump is vibrating;
why maintenance staff have installed an unofficial lifting point;
why a pipe spool has been modified.
Those clues are interpreted by experienced people.
A mechanical engineer who also understands fabrication, machining, fitting, maintenance and installation can interpret physical evidence differently from someone who sees only geometry.
That practical perspective becomes extremely valuable when combined with accurate digital measurement.
12. Reality Capture Should Not Be Treated as a Separate Profession From Engineering
3D laser scanning is sometimes marketed primarily as a surveying or visualisation service.
For mechanical engineering, its value can be much broader.
The point cloud can become the measurement foundation for an engineering decision.
The process may begin:
Physical Plant
↓
3D LiDAR Capture
↓
Registered Point Cloud
↓
Engineering Review
↓
Existing-Condition CAD
↓
Design Development
↓
Installation
↓
Verification Scan
This creates traceability between reality and design.
13. The Challenge of Too Much Data
Modern engineers also face the opposite problem to engineers of the past.
Historically there might have been too little information.
Today there can be too much.
A large laser-scanning campaign can generate billions of points.
Digital twins can contain enormous amounts of asset information.
Sensors can stream data continuously.
AI can produce hundreds of design options.
The engineer therefore needs to determine:
What information actually matters to the decision?
More data does not automatically create better engineering.
Engineering requires interpretation.
14. Constructability Must Become Part of Mechanical Design
A mechanical assembly is not complete simply because it can be modelled.
It needs to be built.
For brownfield projects, constructability may involve:
shutdown windows;
crane access;
temporary works;
rigging;
transport routes;
removable sections;
bolted versus welded connections;
module size;
site welding restrictions;
hot-work restrictions;
existing equipment that cannot be moved.
Designing around these limitations early can substantially reduce site modifications.
15. Mechanical Engineers Must Design for Shutdown Duration
This is particularly important in mining, mineral processing, manufacturing and energy.
A plant shutdown can cost enormous amounts in lost production.
A theoretically cheaper mechanical solution may therefore be commercially worse if it requires an additional two days of shutdown.
Modern mechanical engineering increasingly needs to consider:
engineering cost + fabrication cost + installation cost + production impact.
That means the “best” solution is not always the lowest-mass or lowest-fabrication-cost solution.
It may be the option that can be installed fastest and most reliably.
16. Verification Is Becoming a Normal Part of Engineering
There is another significant change underway.
Historically, drawings were often treated as evidence of what should have been built.
Increasingly, digital measurement allows engineers to establish what was actually built.
This makes possible workflows such as:
design model versus installed point cloud.
The comparison can identify:
positional deviation;
missing components;
incorrect orientations;
steelwork misalignment;
pipe offsets;
equipment displacement;
construction tolerance issues.
That can be valuable during both construction and commissioning.
17. What These Australian Projects Have in Common
Snowy 2.0, Western Sydney International Airport, Olympic Dam and Scarborough appear to be completely different projects.
One is pumped hydro.
One is aviation infrastructure.
One is mining and metallurgical processing.
One is LNG.
Yet they share remarkably similar engineering challenges.
They all require engineers to answer:
What actually exists?
The design information needs to correspond with physical reality.
Will it fit?
Equipment has to coexist with structures, services and other machinery.
Can it be installed?
The installation path matters.
Can it be maintained?
Future removal and access need to be considered.
Will the interfaces align?
New equipment has to connect to surrounding systems.
Can we verify it?
Completed construction needs to be checked against engineering intent.
These are not primarily drafting questions.
They are engineering integration questions.
18. Where Hamilton By Design Can Assist
Hamilton By Design's relevance to projects of this type is not that it replaces major EPCM contractors, specialist process engineers or project engineering teams.
Rather, specialist mechanical engineering and reality-capture services can support defined work packages where accurate existing-condition geometry and practical engineering interpretation are required.
Potential areas include:
terrestrial 3D LiDAR scanning;
existing-condition plant capture;
point-cloud registration and engineering review;
scan-to-CAD;
mechanical equipment modelling;
SolidWorks modelling;
reverse engineering;
conveyor and chute geometry;
access-platform and structural interface design;
mechanical layouts;
maintenance-clearance studies;
installation planning;
fabrication drawings;
brownfield modification design; and
post-installation dimensional verification.
The strongest value proposition is not simply:
“We have a laser scanner.”
It is:
Accurate reality capture interpreted through practical mechanical engineering experience.
19. From the Tradesman’s Eye to Digital Engineering
Mechanical engineering is becoming increasingly digital.
But the physical world has not disappeared.
Bearings still fail.
Chutes still wear.
Steel still deflects.
Gearboxes still vibrate.
Pipework still clashes.
Components still need to be lifted.
Maintenance personnel still need physical access.
Fabricators still need drawings they can manufacture from.
The strongest engineering workflow therefore combines both worlds.
Practical site knowledge
Engineering fundamentals
3D LiDAR measurement
CAD and mechanical drafting
Simulation and analysis
Digital engineering
Professional judgement
That combination allows the engineer to move from:
What actually exists?
to:
What is the engineering problem?
to:
What should be changed?
to:
Will it work?
to:
Can it be fabricated and installed?
to:
Can we prove the completed work is correct?
The Future of Mechanical Engineering Is Engineer-Led Digital Integration
The major engineering projects underway across Australia show that mechanical engineering is not becoming less important.
It is becoming more interconnected.
Modern engineers need to understand not only individual machines, but also the systems surrounding them.
They need to work with accurate digital information without losing sight of physical reality.
They need to use AI and automation without surrendering engineering judgement.
They need to consider fabrication and maintenance before detailed drawings are completed.
And increasingly, they need to verify the existing environment before designing major brownfield modifications.
The mechanical engineer of the future may therefore spend less time manually producing geometry and more time answering the difficult questions:
What is actually there?
What problem are we really trying to solve?
What constraints matter?
How will we manufacture it?
How will we install it?
How will we maintain it?
How will we verify it?
The tools will continue to change.
The engineering responsibility remains.
For mechanical drafting, design and brownfield engineering in Sydney and across Australia, that creates an opportunity to move beyond simply documenting equipment.
The future lies in connecting physical reality, engineering judgement and digital design into one continuous engineering process.
Major Projects Discussed
Snowy 2.0 — Snowy Hydro
The pumped-hydro project is progressing through major underground construction and toward power-station fitout, with construction reported at more than 70% complete during 2026.
Western Sydney International Airport
Cargo operations commenced in July 2026, with passenger services scheduled from 25 October 2026.
Olympic Dam Smelter and Refinery Expansion — BHP
BHP continues planning for a potential major expansion of South Australian copper-processing capacity, with phase one centred on upgrading the Olympic Dam smelter and refinery.
Olympic Dam Underground Materials Handling — BHP
Current investment includes expansion of the underground electric rail network and additional ore-pass capacity.
Scarborough Energy Project / Pluto Train 2 — Woodside
The project was reported at more than 98% complete in August 2026 and is targeting first LNG cargo in Q4 2026.
Hamilton By Design is not represented here as being engaged on any of the projects discussed. These projects are used as current examples of the engineering challenges faced across major Australian infrastructure, mining and energy developments.
