164: CAD: The Gateway to Making Dreams a Reality

A CNC machined part is made using computer-controlled machines that cut material into a precise shape. “CNC” stands for computer numerical control, and it’s commonly used when you need repeatable, tight tolerances for engineered components.

Optomechanical design is the engineering of optical systems together with the mechanical structures that hold, align, and move them. It’s a discipline where small mechanical changes can strongly affect optical performance, so precision and stability matter.

LiDAR is a sensing technology that uses laser light to measure distances and build a 3D map of the environment. It’s especially relevant to autonomous vehicles and robotics because it can detect objects and terrain shape with high spatial detail.

Autonomous vehicles are cars or robots that can perceive their surroundings and drive without a human controlling every action. They rely on sensors and software—often including LiDAR—to understand roads, obstacles, and terrain.

CAD (computer-aided design) is software used to create detailed 2D/3D models of parts and assemblies. In automotive and off-road contexts, CAD is how designers iterate on geometry before anything gets built or machined.

SOLIDWORKS is a widely used CAD software package for modeling parts and assemblies, and for supporting engineering workflows like drawing generation and simulation. Saying “SOLIDWORKS proficiency” implies the guest can translate ideas into buildable, dimensioned designs.

Pre-runners are off-road trucks built and driven ahead of a race to scout routes and conditions. They’re typically set up for high-speed desert travel, with durability-focused suspension and protection for rough terrain.

Control arms are suspension links that connect the chassis to the wheel hub, helping control wheel motion. In off-road racing, their geometry and strength strongly affect handling, ride compliance, and how well the vehicle stays stable over bumps.

“Baja bugs” are Volkswagen Beetles modified for off-road racing in the Baja region. The key idea is adapting the Beetle’s platform for rough terrain—often with suspension changes like extending trailing arms to increase travel.

Trailing arms are suspension links that control wheel movement relative to the chassis, typically allowing the wheel to travel while maintaining alignment. Extending trailing arms is a common way to increase suspension travel for off-road conditions, improving traction and reducing harsh impacts.

“Class 10” is an off-road racing class (in the Baja/short-course desert world) that defines rules for vehicle type and modifications. Mentioning it signals a specific competitive category with established engineering solutions that builders evolve over time.

“Class one” refers to another off-road racing class with its own rule set for vehicle configuration and allowed modifications. In the context of the episode, it’s used to show how the same core buggy architecture evolved across multiple competitive categories.

A transaxle is a combined transmission and differential assembly, often packaged together to save space and improve weight distribution. In off-road race buggies, using a transaxle helps package the drivetrain efficiently while supporting durability under high loads.

A sheet-metal fabricated assembly is built by cutting and forming thin metal sheets (often with bends, brackets, and welds) into a larger component. It’s a common manufacturing route, but it can limit how complex the final geometry can be compared with machining from solid stock.

Billet parts are machined from a solid block of metal (billet), rather than formed from sheet metal or cast. Because billet starts as a uniform chunk, it can support very precise features and tight tolerances—useful for suspension components and hubs that need accurate mating surfaces.

Portal hubs are off-road hub assemblies that use a gear reduction to raise the axle centerline relative to the wheel. That increases ground clearance and can improve torque delivery at the wheels, but it also demands precise machining where parts interface.

Generative design is a CAD approach where you specify goals and constraints (like strength, weight, and manufacturing limits) and the software explores many possible geometries. It’s especially useful for optimizing complex parts, and it can pair with simulation tools to validate results before cutting metal.

CNC machining is a subtractive manufacturing process where computer-controlled machines cut material away to make a part. The host is contrasting it with additive manufacturing because some generative-design shapes are difficult or inefficient to carve out of a solid block.

3D printing here refers to powder-bed laser fusion, where a laser traces each layer and fuses material together. The host describes an early system using plastic powder and later notes the same approach being used with titanium.

An exhaust manifold is the component that collects exhaust gases from the engine’s cylinders and routes them toward the turbo or exhaust system. For turbo setups, manifold design affects fitment, flow, and how well the turbo can spool under different driving conditions.

Garrett G32 refers to a specific turbocharger family/model from Garrett. Turbochargers like this are used to force more air into the engine, improving power potential—especially when paired with a custom exhaust manifold and matching downpipe/exhaust hardware.

A V-band is a type of exhaust joint that uses a V-shaped clamp and mating flanges to create a compact, leak-resistant connection. It’s popular in turbo and performance exhaust setups because it’s easier to remove and reassemble than many traditional flange styles.

Turbo header manifolds are the exhaust manifolds that route exhaust gas from the engine cylinders into the turbocharger. Their shape strongly affects how evenly the exhaust pulses reach the turbo, which can influence spool-up and overall response. In performance builds, they’re often designed for equal-length runners to improve flow consistency.

Additive manufacturing is the process of building parts by adding material layer-by-layer, rather than cutting them from a solid block. It’s useful when you want complex internal shapes or hard-to-fabricate geometries, like optimized exhaust runner paths. The tradeoff is that part strength can depend on how the part is oriented during printing.

Flow analysis is simulation (often CFD) used to predict how fluid—here, exhaust gas—moves through a component. For exhaust headers, it helps designers compare runner shapes and predict where turbulence or uneven flow might occur. That’s why the discussion mentions optimizing the path and avoiding internal vortices.

Equal length refers to making the exhaust runners (the individual paths from each cylinder) the same length in a header. The goal is to synchronize exhaust pulse timing so the turbo sees a more consistent flow. This can improve drivability and reduce cylinder-to-cylinder imbalance.

Vortexes are swirling flow patterns that can form inside ducts or manifolds when the geometry causes turbulence. In exhaust headers, unwanted internal vortices can reduce effective flow and make cylinder-to-cylinder delivery less consistent. Designers try to minimize them through runner shaping and flow optimization.

Inconel (spoken here as “incanel”) is a family of nickel-based superalloys known for high-temperature strength and corrosion resistance. That makes it attractive for turbo exhaust components that see extreme heat cycles. The key point is that some alloys are hard to machine conventionally, so additive manufacturing can be a better fit.

Print volume is the maximum build envelope of a 3D printer—the largest size of part it can physically fabricate in one go. It becomes a constraint for additive manufacturing because large components may require splitting into sections or using a much larger printer. That’s why the discussion contrasts additive limits with CNC’s ability to handle huge workpieces.

An upper control arm is a suspension link that locates the wheel and controls its motion relative to the chassis. It sees significant bending and side-load forces, so material strength and stiffness matter. The transcript uses it as an example of a part where print orientation can change real-world load performance.

In additive manufacturing, parts are built from layers, and the bonding between those layers can affect strength. That’s why the same geometry can have different mechanical properties depending on the print orientation. For load-bearing automotive parts, this orientation sensitivity is a major design consideration.

Waterjacking (in this context) means adding a water-cooled jacket or water passages around a component to remove heat. It’s commonly used in marine applications because water cooling can be integrated into complex shapes that are difficult with traditional fabrication.

Blender is a 3D creation suite used for modeling, rendering, and animation, and it’s also used in workflows that involve exchanging CAD-like geometry. Here it’s linked to Fusion 360 via file compatibility, supporting a mixed toolchain for designing and visualizing parts.

Fusion 360 is a CAD/CAM software platform used to design and model parts, often for prototyping and manufacturing workflows. In this episode, it’s discussed as a common home-enthusiast 3D modeling tool that can exchange files with Blender.

RAM (random-access memory) is the computer’s fast working space for data the software needs right now. In CAD, running out of RAM can slow things down because large models must be loaded and managed more often.

An external GPU is a separate graphics card housed in its own enclosure, connected to a laptop. It lets you keep a portable computer while still getting desktop-class graphics performance for CAD workflows.

A workstation graphics card is a GPU designed for professional 3D and engineering workloads rather than just gaming. These cards are typically optimized for stability and CAD/3D software compatibility, which can help with smoother model handling.

Large assembly mode is a CAD feature that changes how the software handles very big assemblies to improve responsiveness. It’s meant to reduce slowdowns when opening and working with huge models that would otherwise overwhelm system memory.

FEA (finite element analysis) is a simulation method used to predict how a part will deform and stress under loads. It breaks a 3D model into many small elements (often triangular prisms) and calculates how the “nodes” interact based on the material’s properties. The results help engineers choose shapes and materials before building physical prototypes.

Finite element analysis is the full name of FEA and describes the workflow: discretize a geometry into small elements and solve for deformation and stress. In the segment, the host explains that smaller elements generally improve accuracy, but the model still depends heavily on correct setup and material properties. It’s a core engineering tool for validating component designs.

The “von Mises” coefficient (often called von Mises stress) is a material-science metric used in FEA to estimate when a material is likely to yield under complex loading. It converts multi-direction stress states into a single equivalent value that can be compared against material strength. The host mentions it as part of the material properties programmed into the simulation software.

Statics analysis is an FEA/engineering approach that focuses on forces in equilibrium (no acceleration), often used for preliminary sizing. In the segment, it’s used to relate corner weight and part geometry to required shock force and spring rate. It’s a common early step before more complex dynamic simulations.

Spring rate is the stiffness of a spring, typically expressed as how much force is needed to compress it by a given amount. In suspension design, spring rate strongly affects ride comfort and how the vehicle supports cornering and bumps. The host ties it to load and shock force in the statics example.

In engineering, an iterative workflow means you run analysis, compare results to expectations, then revise the design and repeat. Here, they describe using FEA to identify overbuilt areas, then adjusting the CAD geometry to optimize strength and weight.

“Garbage in, garbage out” describes how simulation quality depends on input quality: if the loads/forces are wrong or poorly estimated, the results will be wrong too. The segment ties this to off-road racing, where forces can vary a lot with speed, impacts, and driving conditions.

A shock load is a sudden, high-magnitude force applied over a short time, like an impact or abrupt suspension event. The segment says they model a shock load to represent what the vehicle experiences during use, then analyze the part under that loading case.

“10 Gs” means an acceleration level of about ten times Earth’s gravity (10g). In structural/suspension analysis, using a high-g shock case helps ensure components can survive severe impacts and dynamic loads, even if the exact real-world event varies.

A safety factor is how much stronger engineers design a part to be than the maximum load it expects to see. For example, if a part needs to handle a certain force, a safety factor of 2 means it’s designed to survive about twice that load. The tradeoff is that higher safety factors usually add weight and cost.

In CNC design, inside corners (concave corners) can be difficult because an end mill has limited reach and tool geometry. If the corner is too tight, the cutter can’t physically enter, forcing redesign or expensive workarounds like special tooling or slower multi-step machining.

An end mill is a type of rotating cutting tool used in CNC milling to remove material and create pockets, slots, and complex 3D shapes. Its shape and reach determine what geometries are practical—especially around tight inside corners.

A five-axis mill can move the tool/workpiece along five degrees of freedom, allowing the cutter to approach a part from more angles. That reduces the need for flipping and can make previously hard-to-machine features (like certain pockets and angles) more achievable and consistent.

A three-axis mill is a CNC machining setup where the tool can move along three directions (typically X, Y, and Z). That limits how the part can be oriented and machined in a single setup, so complex shapes often require more fixturing or multiple operations.

A five-axis CNC machine adds two rotational degrees of freedom (in addition to the three linear axes), letting the tool approach the part from more angles. That makes it easier to machine complex, contoured, or angled features in fewer setups.

The episode describes how CNC parts are priced based on machining effort rather than just part size. It emphasizes that design choices that increase toolpaths, complexity, or difficulty can raise spindle time and drive up the quote.

Spindle time is the amount of time the CNC spindle runs cutting the material. Because most machining quotes scale with how long the machine is actively removing metal, more complex geometry typically increases spindle time and therefore cost.

A tolerance is the allowed “error range” for a dimension on a machined part. Tighter tolerances mean the part must be made more precisely, which usually increases machining time and cost.

Geometric dimensioning and tolerancing (GD&T) is a standardized way to specify not just sizes, but also the allowed shapes and relationships between features. It helps machinists and inspectors understand exactly what must be accurate and how to measure it.

A reamer is a cutting tool used to finish and refine an existing hole to a very accurate diameter. Using a precision reamer is slower than rough machining, but it’s how shops hit tight dimensional targets like “thousandth” levels.

A tool change is the process of swapping cutting tools (or tool holders) during machining. It adds non-cutting time—like picking up the next tool, switching, and reorienting—so it increases overall manufacturing cost.

The inspection process is the step where parts are measured to confirm they match the drawing’s specifications. It often requires dedicated metrology equipment and controlled conditions (like temperature control) because measurement accuracy can be affected by thermal expansion.

A first article inspection is an early production check where the shop measures the initial part(s) to verify the process can meet the specification. If tolerances aren’t clearly called out, shops may only check the first article rather than every part.

Five axis machining is a CNC process where the tool and/or workpiece can move along five axes, allowing complex shapes to be cut from multiple angles without repositioning. It’s powerful for tight packaging and complex geometry, but it’s typically more expensive because it requires more setup and more complex toolpaths.

Suspension kinematics describe how the suspension geometry moves as the wheel travels—how arms, links, and pivots change angles and positions. That movement affects handling and ride because it changes things like camber gain, roll behavior, and how the tire stays in its best contact patch, whether the vehicle is on-road or off-road.

Designing “in the virtual world” means using computer modeling (often CAD and simulation) to develop suspension geometry before any physical parts are built. It’s useful for exploring packaging and kinematics quickly, but real-world testing can reveal issues like compliance, manufacturing tolerances, and unexpected binding.

Wheel travel is the distance the wheel can move through the suspension’s suspension stroke (typically from full droop to full bump). More wheel travel can help off-road vehicles keep tires in contact over bumps and ruts, but it must be balanced against geometry limits and component clearances.

Lower control arm pivot mounts are the attachment points on the chassis where the lower suspension arms rotate. Their location sets key suspension geometry, influencing wheel path, camber behavior, and how the suspension clears other components at full bump and droop.

A trophy truck is a purpose-built off-road race truck designed for extreme suspension travel, durability, and traction over rough terrain. Because it’s built to survive big impacts, suspension geometry choices (like control arm placement and wheel travel) are tightly linked to performance and reliability under harsh conditions.

A spherical bearing (often called a “heim joint” in off-road) uses a ball-and-socket design to allow movement with low friction and minimal compliance. In suspension builds, spherical bearings can improve control by reducing bushing flex, but they can also transmit more noise/vibration and may require careful alignment and protection from contamination.

Camber and caster are wheel alignment angles that strongly affect how a tire contacts the road. Camber is the inward/outward tilt of the wheel, while caster is the fore/aft tilt of the steering axis that helps with stability and steering feel.

Droop is the suspension’s extension travel—how far the wheel can move downward relative to the chassis. Designers check droop to ensure the tire maintains good geometry (like reasonable camber) when the suspension is hanging.

Full compression is the suspension’s maximum bump-travel position, where the suspension is pushed upward as far as it can go. At this point, designers verify clearances and geometry and ensure the shocks and linkages behave correctly without binding.

Shock length is the physical stroke/overall size of the shock absorber, which determines how the suspension can move through droop and compression. Correct shock length is critical to avoid running out of travel or creating geometry problems at the ends of suspension movement.

A progressive suspension load means the resistance increases as the suspension compresses further. This is often achieved through shock/spring geometry and helps control harshness while still providing strong support near the end of travel.

Independent rear suspension (IRS) means each rear wheel can move up and down somewhat independently. This can improve ride comfort and traction because one wheel’s movement doesn’t force the other to move the same way.

A solid axle connects both wheels with a single rigid beam, so movement on one side affects the other. Solid axles are common on off-road and heavy-duty applications because they’re durable and can be easier to set up for articulation.

Bump steer is the tendency for a car’s steering angle to change as the suspension moves over bumps. It happens when the suspension link geometry doesn’t keep the wheel’s steering axis aligned with the motion of the suspension.

Optimum Kinematics is a suspension-geometry analysis tool used to predict how suspension angles change through travel. It’s aimed at optimizing suspension kinematics—like camber change and bump steer—before building hardware.

Suspension kinematics is the study of how suspension components move relative to each other. In practice, it’s used to predict wheel angles (like camber) and steering changes (like bump steer) throughout the suspension’s travel.

Four-link calculators are tools used to design and evaluate a four-link suspension setup, which uses four control arms to locate the axle or wheel assembly. They help estimate geometry outcomes like camber behavior and how the suspension moves through travel.

Camber is the angle of the tire relative to vertical when viewed from the front or rear of the car. A “camber curve” is how that camber angle changes as the suspension moves through its travel, which affects tire contact patch shape and grip. In off-road, the host argues camber sensitivity is higher because traction is limited and tires deform more over bumps.

An i-beam suspension is a type of front suspension that uses an I-shaped beam to locate the wheel while allowing vertical movement. In the early Baja context, the host describes how these setups could let the wheels “duck” to gain maximum travel over rough terrain. That geometry is part of why the suspension can keep tires working in low-grip conditions.

Maximum suspension travel is the total range the suspension can move from full droop to full compression. The host argues that in off-road, targeting more travel helps the wheels follow the terrain and keeps the tire contact patch working despite bumps and low grip. He connects this directly to the “whoops” behavior and tire sidewall deformation.

The tire sidewall is the flexible rubber structure between the tread and the tire’s bead. In off-road, the sidewall’s flex and deformation can significantly affect how the tire maintains shape and contact patch under load and at large camber angles. The host uses sidewall behavior to explain why camber angles matter so much in low-grip conditions.

“Death wobble” is a severe front-end oscillation where the steering and suspension rapidly shake, often triggered by speed, uneven surfaces, or worn/loose components. The host uses it as a real-world failure mode to justify why alignment and suspension geometry (like caster) matter as off-road vehicles push higher speeds. It’s a safety-critical phenomenon rather than just “rough ride.”

The Ford Maverick is a compact pickup truck known for being practical and relatively affordable compared with larger trucks. In a podcast context, it may come up when someone is describing a “Maverick” concept or design idea, even if they’re using the name as a reference point for a vehicle style or layout. It’s often discussed because it represents a smaller, more everyday approach to pickup ownership.

Ultra4 is an off-road racing class built around purpose-built, high-travel vehicles designed for extreme terrain. The host describes it as scaling up from production side-by-sides like a Can-Am Maverick or Polaris Razor, then using very large tires to reduce how harsh bumps feel. The key idea is maximizing suspension travel and tire size to keep the car controlled over big impacts.

The Can-Am Maverick is a production side-by-side (SxS) off-road vehicle line used as a reference point for how Ultra4 builds scale up. The host’s point is that Ultra4 takes the basic idea of an SxS platform and enlarges it dramatically for racing—especially in tire size and suspension travel. That’s why it’s mentioned in the context of “scaled all the way up.”

The Polaris Razor is a production off-road side-by-side (SxS) line the host compares to Ultra4 race vehicles. The comparison is about scaling: Ultra4 takes the SxS concept and enlarges it significantly, including much larger tires and suspension travel. Mentioning Polaris Razor helps listeners visualize the “starting point” before the extreme race build.