Never thought this build would make me quit

Key Concepts

• Kinetic Necklace: A wearable necklace designed with a functional, miniature roller coaster track.
• Ring Roller: A component from model train sets used to facilitate continuous movement of the coaster car.
• Hinge & Lock Mechanism: Critical elements for creating a continuous, wearable track.
• Solder Joint: A method of joining metal components using a melted alloy.
• 3D Printed Metal: An alternative fabrication method chosen for increased durability and reliability.

Initial Concept & Fabrication Attempts

The project centered around creating a functional, wearable necklace featuring a miniature roller coaster that continuously circles the wearer’s neck. The initial concept involved utilizing components from a model train set, specifically a “ring roller,” to achieve continuous motion. The creator sourced this component from a local model train shop, believing it to be a viable foundation for the design. A key challenge identified early on was the need for a single, unbroken track to form the necklace. This necessitated the incorporation of a hinge and a locking mechanism to allow the necklace to be put on and taken off while maintaining track integrity.

Design & Engineering Challenges – Version 1-5

The creator explicitly states that the initial attempts at constructing the necklace were fraught with difficulty. Five distinct versions were prototyped before achieving a seemingly functional design. The process involved significant engineering challenges related to maintaining the track’s structural integrity, ensuring smooth car movement, and reliably operating the hinge and lock. The final version, after numerous iterations, appeared successful, hinging on the stability of a single “solder joint” – a connection created by melting and flowing a filler metal (solder) to join metal items.

Catastrophic Failure & Shift in Methodology

Despite the apparent success of the fifth prototype, the project experienced a critical failure. The crucial solder joint broke, resulting in a complete derailment of the roller coaster car. The creator humorously describes the outcome as far exceeding a simple derailment, characterizing it as a catastrophic event involving the coaster catching fire and, metaphorically, launching the wearer into a tree. This failure led to a decisive shift in the project’s methodology.

Transition to 3D Printed Metal Fabrication

Following the failure of the initial, manually constructed prototypes, the creator announced a change in fabrication strategy. The project would now utilize 3D printed metal components instead of relying on assembled model train parts and soldering. This decision was motivated by the need for increased durability and reliability. The creator explicitly stated, “I am officially giving up… just on doing it this way,” indicating a recognition that the original approach was fundamentally flawed in achieving a robust and safe wearable design. The move to 3D printed metal suggests a desire for greater control over material properties and structural design.

Synthesis & Main Takeaways

The project initially aimed to create a novel kinetic necklace using readily available model train components. However, the inherent limitations of these components, particularly the fragility of soldered joints, led to repeated failures. The experience highlighted the importance of material selection and fabrication techniques in achieving a functional and durable design. The ultimate decision to transition to 3D printed metal represents a pragmatic adaptation, prioritizing reliability and structural integrity over the initial simplicity of the original concept. The project serves as a cautionary tale regarding the challenges of translating a seemingly simple idea into a physically viable product, and the necessity of adapting one’s approach in the face of unforeseen engineering obstacles.