Sim Racing Hardware

Sim Racing Hardware Thermoplastic Polyurethane 1195A Injection Molding with Arburg Allrounder H 4700T

As engineers designing for the limit, we understand that the interface between human and machine is where performance is won or lost. In the world of high-fidelity Sim Racing Hardware, this interface is not just a point of contact; it's a high-bandwidth channel for physical feedback. The grip on a wheel, the face of a brake pedal, the surface of a sequential shifter—these components are subjected to intense forces, constant abrasion from gloves, and exposure to sweat and oils. They must provide consistent, predictable tactile feedback, lap after lap, session after session. The engineering challenge is immense: produce parts with the durability of industrial components, the ergonomic feel of a high-end sports car, and the dimensional precision required for seamless electronic integration, all while being commercially viable.

This is where conventional materials and processes fall short. Machining from billet is too slow and costly, and often can't produce the complex, ergonomic surfaces required without multiple, tolerance-stacking setups. Standard injection molding with commodity plastics lacks the requisite durability and tactile properties. The solution lies in a specialized combination of advanced materials and process control. We're talking about molding a high-performance polyester-based thermoplastic polyurethane, specifically BASF Elastollan 1195A, a material renowned for its exceptional abrasion resistance and toughness. However, its very strengths make it notoriously difficult to process. It is both hygroscopic and shear-sensitive, a combination that can lead to catastrophic part failure if the molding process is not perfectly controlled. At MechanoFab, we have engineered a definitive solution, pairing this demanding material with the precision of our Arburg Allrounder H 4700T injection molding cell to create net-shape components that are simply unattainable through other means.

System-Level Compliance: De-Risking Your CE and FCC Certification Path

When developing hardware for a global market, compliance is not an afterthought; it's a foundational design requirement. Our manufacturing process is architected to de-risk your path to both CE and FCC certification, ensuring your components contribute to, rather than complicate, system-level approval.

CE Marking: For a component integrated into an electronic assembly, the CE mark signifies conformity with multiple EU directives. Our process directly addresses the most critical ones. The use of a premium, well-documented polymer like BASF Elastollan 1195A provides a clear and traceable path for RoHS (Restriction of Hazardous Substances) and REACH (Registration, Evaluation, Authorisation and Restriction of Chemicals) compliance. We provide full material datasheets and lot traceability, eliminating ambiguity. Furthermore, our mastery of the molding process ensures the full mechanical properties of the polymer are realized. This is critical for the Low Voltage Directive and Machinery Directive, where the physical integrity of enclosures and user-interface components is paramount. A part molded with micro-cracks or internal stresses from poor process control is a latent failure point; our process eliminates this risk.

FCC Compliance: While a non-conductive polymer part itself does not emit radio frequencies, its role as an enclosure or structural element for PCBs and sensors is critical for system-wide EMI/EMC (Electromagnetic Interference/Compatibility) performance. FCC Part 15 regulations for electronic devices are strict. The dimensional stability and dielectric consistency of the housing material are crucial for predictable RF shielding and performance. Our process, centered on the Arburg's SELOGICA control system, guarantees unparalleled shot-to-shot consistency. This means every single part, from the first to the thousandth, maintains the exact same geometry and material density. This consistency ensures that the performance of your integrated electronics is not subject to variations in the mechanical housing, providing a stable baseline for your FCC testing and validation efforts. By molding a perfect, void-free part, we ensure its dielectric properties are uniform, preventing unexpected signal path interference or shielding failures.

Core Capability Parameters: The Engineering Specification

This is not marketing material; this is the data. The following table outlines the specific material properties and machine parameters that define this manufacturing capability. These are the numbers that govern the performance, precision, and viability of your component design.

Cost & Volume Dynamics: Mastering the Process Window for Mid-Volume Production

The economic sweet spot for this capability is a production volume of 250 to 1,000 units. This range is often a "valley of death" for manufacturing—too small for massive, dedicated production lines, yet too large for prototyping methods. Our process is explicitly optimized for this niche, delivering mass-production quality and consistency at a viable cost structure, primarily by mastering the unique challenges of the material itself.

Processing a hygroscopic, shear-sensitive Thermoplastic Polyurethane like 1195A is a challenge we've mastered. The core problem with polyester-based TPUs is their affinity for atmospheric moisture. If not meticulously pre-dried to a specific moisture content (typically below 0.05%), the polymer chains will undergo hydrolysis under the heat and pressure of the molding barrel. This chemical reaction permanently severs the polymer chains, drastically reducing molecular weight and destroying the material's hallmark toughness and abrasion resistance. The result is a brittle part, often with visible splay marks or silver streaking on the surface. Our process begins with calibrated, closed-loop drying systems to guarantee the resin is in perfect condition before it ever enters the machine.

Once in the machine, the second challenge emerges: shear sensitivity. The long-chain molecules that give TPU its strength can be mechanically torn apart by excessive shear stress. This can happen with overly aggressive screw speeds, high injection velocities, or poorly designed gates in the mold. This creates an extremely narrow processing window. You must inject fast enough to fill the entire mold cavity before the material freezes off, yet gently enough to avoid shear-thinning degradation. This is where our investment in the Arburg Allrounder H 4700T pays dividends. Its advanced SELOGICA control system is the key. It allows us to program a multi-stage injection profile, precisely controlling the velocity and pressure at every point in the injection cycle. We can begin injection slowly to gently introduce material through the gate, ramp up speed to fill the bulk of the part, and then transition to a precise packing phase to eliminate sink and voids without over-pressurizing the cavity. This level of control is simply not possible on lesser machines.

This single-setup, net-shape molding strategy is fundamentally superior to multi-stage machining approaches. Machining a complex grip from a block of polyurethane introduces a host of variables: tool deflection on thin sections, heat buildup causing material gumming, and tolerance stack-up from multiple fixtures. The surface finish is also a product of tool paths, which can never truly replicate the flawless, uniform finish of a polished mold cavity. Our single-shot injection molding strategy at MechanoFab eliminates these variables entirely. The part emerges from the mold as a finished, net-shape component with exceptional surface quality and abrasion resistance, ready for assembly.

For the 250-1,000 unit volume, the Arburg's rotary table design is a force multiplier. For a complex part that may require a longer cooling time to ensure dimensional stability, a single-station machine's cycle time is dictated by that long cooling phase. Our multi-station rotary table decouples injection from cooling. While one part is cooling at station two, the machine is already injecting the next part at station one. This parallel processing can slash cycle times by 30-50%, directly reducing the piece-part cost and ensuring absolute shot-to-shot consistency for batch production. This efficiency is what makes high-performance molding accessible and affordable in the mid-volume range, lowering the Total Cost of Ownership (TCO) by minimizing scrap, eliminating secondary operations, and maximizing throughput.

Conclusion: Your Partner for High-Performance Components

In the competitive landscape of sim racing, every component matters. Achieving the ultimate in durability, tactile feel, and precision requires more than just a good design; it requires a manufacturing partner who has mastered the materials and processes to bring that design to life without compromise. Our specialized capability in molding BASF Elastollan 1195A on the Arburg Allrounder platform is that solution. We have tamed a difficult material and optimized a process to deliver superior components, on-spec and on-budget.