KAOS Core CS-270 is a single welded steel tub carried between two complete running-gear cartridges. The cartridges bolt on. So does the power module. A shop that can make a track frame does not have to make a machine.
Not a chassis with a body dropped onto it. One welded steel box, the length of the machine, doing three jobs at once.
KAOS Core CS-270 is built around a single welded steel tub running between the tracks. It ties the two running-gear cartridges together and takes the twist between them, which on rough ground is the load nobody sees. It carries the deck and everything bolted to it, and it carries the recovery loads, so a pull at an eye reaches the whole structure. Inside, two fabricated longitudinal box members take the bending.
The battery bays are cut into the low centre, so the heaviest single mass sits as low and as central as steel allows, inside the structure rather than slung beneath it. What that buys electrically belongs to Power and energy. The structural half is simpler: the pack is protected by the box that carries it, and the guards below are designed to be thrown away.
A structure is an argument about where load is allowed to go. Six rules settle it before anything is drawn.
Each of the six closes a way a work platform gets weaker in service than it was on the bench, and each carries its reason, so a later change argues with the reason rather than the rule.
On most machines the layout is the residue of every other decision. Here each zone carries a rule about what lives in it and how it is reached.
Seven zones, each with a packaging rule that constrains its contents and its service access, all on one master chassis coordinate system with a defined origin and direction convention. Every subassembly mates to it through a controlled interface rather than by eye. The model is built in that order too: supplier envelopes first, then the batteries and the path they come out on, then the power module, then the cartridges and their datums, and the tub skeleton last. The line is indexed from the CDNS KAOS platform page.
The lowest protected mass, and nothing there wants service under an energized vehicle.
Out as one unit, upward or rearward, on defined lifting points.
Removal from outboard, so changing a drive never means going inside.
Forward and central, which keeps the hydraulic runs to the deck short.
A clear rectangle with a controlled centre-of-gravity limit and nothing else intruding.
Sensing and lighting, protected from debris and never occluded by the deck load.
Distribution, diagnostics, filters and sample points, at ground level on one side.
Defined origin, defined directions, a controlled interface wherever two assemblies meet.
An eight-view general arrangement says more about a work platform than a paragraph does, because proportion is where the decisions surface.
Three things are worth looking for. The tub is long and low and the cartridges run its full length, because footprint is what buys flotation. The deck sits above the frame line as one clear rectangle. And the power module is at the back, where a lift can reach it. What the deck accepts is on Configurations and the deck.
Most tracked machines are welded assemblies whose running gear is a workshop job. This one is bolted at every joint that matters.
Each side is a complete cartridge: frame, rollers, front idler, tensioner and recoil, chain, shoes and the drive at the back. It bolts to a machined face on the tub. Undercarriage is the largest consumable on a tracked machine, so it is a replaceable major assembly and not a fabrication, and the fixture that takes it off is designed alongside the machine. The face it lands on was machined for the purpose, so a cartridge is exchanged without uncontrolled alignment drift. The power module is treated the same way, and both change on the ground rather than in a shop. The brake lives inside each final drive, and what it does is on Command and safety.
Shoes come in families for the ground: steel grouser where grip decides the day, rubber or road pads on surfaces that must not be damaged, and a wide low-ground-pressure shoe for snow and soft going. Widening a shoe is not free. It lowers ground pressure, raises the energy it takes to turn, and widens the machine, which is a handling question. Each of those re-checks is mandatory when a track option changes. The platform hands its running-gear supplier a duty and a footprint requirement and asks geometry, ratings and wear life back. Supplier-controlled geometry is not invented here.
Frame, rollers, idler, tensioner, chain, shoes and the drive, bolted to a machined face as one unit. Damaged running gear comes off. It is not rebuilt where it stands.
Engine, generator and their cooling in one module with its own arrangement and its own lifting points, out upward or rearward behind service doors.
KAOS Light, KAOS Core and KAOS Heavy take the same units. One inventory covers three machines, and a shop that builds one assembly supplies the line.
The sharpest piece of engineering on the machine is the joint where a track cartridge meets the tub.
The cartridge lands on a machined, indexed face and is drawn onto it by a ring of large structural bolts. Those bolts are not there to take the load across the joint in shear. They are there to squeeze the two faces together hard enough that friction across the faces carries it. That decides whether the joint survives: a bolt working in shear against repeated track shock frets, loosens and fails, while a preloaded friction joint does not move at all.
Everything else follows. Faces are machined and indexed, and dowels locate rather than carry. The plate around the joint is locally thickened, because a joint clamped against a plate that can flex will pry its bolts open at the edges. And the preload calculation carries scatter, coating friction, thermal effects and the tightening method the shop actually uses, since achievable preload is a property of the process, not of the bolt.
The naive check is refused by name. Dividing a recovery load by the number of bolts and calling the answer the bolt load ignores slip, prying, the moment on the bolt group, local plate bearing and fatigue.
A tracked machine stands where a wheeled one sinks because it spreads its weight over square metres instead of over four patches.
Ground pressure is weight over the area the tracks put on the ground, and that area is shoe width multiplied by the length of track in contact, doubled for two sides. Because the footprint is a design variable, the platform is sized by the pressure the ground can take rather than by what it weighs. Flotation here is a specification, and a track option is chosen against it.
Two things follow that a single quoted figure would hide. An empty machine and a loaded one are not the same machine, and the loaded state is the one anyone works in. And an average is not what the ground feels: weight enters through a finite number of rollers, so the ground under a roller carries more than the ground between them, and a module shifts the centre of gravity, so one end of the track carries more than the other. Ground pressure is a distribution, and the number a soft-ground operator lives with is the highest one under the machine. The declared mass and centre of gravity that make it calculable are part of what a module brings, set out on Configurations and the deck.
What bounds a tracked platform is four separate things, and each one is owned by something different. Naming them apart is what makes a machine specifiable at all.
Grip is bought from the ground, continuous power from the drivetrain, lean angle from the configuration on the deck, and the cost of a turn from a machine that has no steered wheel to turn on. Which of the four bites first changes with the surface, so one quoted figure would hide the other three.
The most force the tracks can put into the ground before they slip is a fraction of the machine's weight, and that fraction is a property of what is underfoot. It collapses on wet clay and on loose gravel.
Climbing at a speed costs power, and above some combination of grade and speed a machine runs out of continuous power rather than grip. Which bites first depends on both, which is the drivetrain's half of the question.
How far a machine can lean is set by track gauge and by the height of the centre of gravity, and a module changes the second of those. A safe side slope is a property of the configuration, not of the platform under it.
A tracked machine has no steered wheel. To change direction it drags its tracks sideways, and on soft or sticky going that skid takes a real share of what the machine spends driving straight. It is the reason a wider shoe floats better and turns harder, and the reason running gear is a system rather than a set of parts.
A load case is a question: what happens when this thing is done to the machine? A set of them argues what a machine's life consists of.
Read together they say things a strength figure cannot. That the likeliest moment to break a work platform is when it is not working. That cross-slope is a condition rather than an event. And that one track hitting something separates a work platform from a truck.
| The case | The question it asks | What it sizes |
|---|---|---|
| Standing still, loaded | How does weight flow through the tub, into the rollers and out to the ground? | The baseline every other case is read against. |
| Transport and lifting | What does it weigh over a bad road, or hanging from a crane? | The lifting eyes, the tie-downs and the structure between them. |
| Braking forward | Where does everything on the deck go when the machine stops? | The module restraint and the chassis path that reacts it. |
| Braking in reverse | The same question backwards, at a lower magnitude. | The rearward share of that same path. |
| Working across a slope | What holds a module on its hard points on a cross slope? | The lateral restraint that keeps a module from walking sideways. |
| One track hitting something | What arrives when one side drops into a hole or slams onto rock? | The cartridge interface and the local hull. The largest vertical case in the set. |
| A straight recovery pull | Can a load enter at one eye and reach the whole structure? | The recovery eyes and their path into the longitudinal members. |
| The recovery proof case | The same pull with snatch, angle and a cable that suddenly takes up. | The primary proof case for the recovery structure. |
| The module leaving forward | What holds the largest mass a customer adds, in the direction it goes? | The forward half of the hard-point grid. |
| The module leaving sideways | The same mass, sideways, and it sits higher than anything else. | The lateral hard points and the allowable mass and centre-of-gravity envelope. |
The set as questions rather than as magnitudes, and applied where the track actually touches the machine.
Three rules travel with the set. A fatigue spectrum built from real mission use and real running-gear dynamics is the harder question that follows these ten. Track shock is introduced at the roller, idler and final-drive reaction points, because a shock applied in the wrong place produces a beautifully converged answer to the wrong question. And equal bolt sharing is never credited blindly. The last two cases are what let the deck carry an allowable mass and centre-of-gravity envelope rather than a blanket tonnage: a low, centred module is a different structural problem from a tall, forward one of the same mass.
There is a written specification for the structural analysis, and its sharpest clauses forbid a model to pass by being wrong.
The model is not one model. A global shell model covers the tub, the deck, the track-interface frames, the recovery crossmembers and the battery protection, and separate sub-models cover every place load concentrates: the cartridge joint, the recovery eyes, the mission hard points, the lift and tie-down brackets. Global models give global answers, and a bolt hole needs its own.
Masses go in where they actually are. The packs, the power module, the traction units, the hydraulics and the deck load are explicit masses at controlled coordinates, not a smeared density. The holes are modelled, because a box with a hole in it is not the same box. Module loads pass through the real hard-point pattern and never through one convenient node.
Two clauses exist purely to close the easiest routes to a passing answer. Track support conditions may not artificially lock the chassis in torsion, and a recovery restraint may fix only the ground reactions that genuinely exist for the direction of pull. Welds are judged on fatigue against a duty spectrum rather than on static stress, which is the difference between a structure that is strong and one that lasts. And the analysis owes the parts nobody enjoys: mesh convergence, element quality, and a reconciliation of the model's mass and centre of gravity against the budget.
How a structure like this is made is a rule about identity, and a short list of things that may never be done to a finished part.
Primary plate is accepted only against mill certificates carrying heat and lot, and that identity is carried forward instead of being lost at the racks.
Procedure, welder and weld map are controlled on primary welds, and a datum report is taken after welding, before the faces are cut true.
The method for a joint is chosen from the load that joint carries, and the record is kept against the joint rather than the batch.
Preparation and film thickness on coating; alignment and tension travel on the running gear; hose identity and cleanliness on the hydraulics.
Continuity on the low-voltage harness, and continuity, polarity and insulation on the high-voltage side.
Each of the four names a shortcut somebody with a deadline would otherwise take quietly. Where Canadian Shield builds is set out under Manufacturing.
A characteristic is released by a sequence, and the discipline is that a model never stands at the end of it.
A characteristic goes analysis, then bench, then vehicle, then acceptance. A model is the first of the four and never the last. Stating the order matters because a model is cheap, fast, persuasive, and answers exactly the question it was asked.
What makes a result mean anything is the record around it. Each is tied to the machine's own identity, its hardware revisions, its software hash and its configuration checksum. Calibrations stay current and traceable. Raw data is retained, and a processed plot never stands in for the file it came from. A deviation is written down before it is accepted rather than explained afterwards.
A machine that has to be moved and serviced is designed for both. Those loads reach primary structure, never bodywork, and the paths that take it apart are drawn with the paths that put it together.
Engineered lifting and tie-down points suit each size, with forklift pockets on the smaller machines, and their loads terminate in the longitudinal structure, not in a panel. Battery pack retention is designed for transport and rollover loads, a different case from standing still and a larger one.
Coming apart is designed as carefully as going together. The running gear leaves each side as one assembly on its own fixture. The power module lifts out upward or rearward on defined points. The packs come out on trays without anybody cutting into the machine. Each is a designed path with a fixture at one end and a landing at the other. Who works this way is on Who it is for.
A bolted architecture is a considered trade with a price attached. It earns that price on work that eats running gear, and it is the wrong answer where a purpose-made machine would do the job.
What a platform is made of decides what it costs to keep working, and this one is made to come apart.
The rest of the line reads out from here. What commands the machine and what stops it is on Command and safety. What the deck accepts is on Configurations and the deck. The buyer's view is Who it is for. Enquiries are screened, and a structure is a good subject to open one on.
