Laser Cutting, Wood Working | Maker Hub 2024 Spring
This report outlines the development process of a unique timing device that operates without any electronic components. The necessity for precise timing combined with a non-electronic mechanism posed a significant challenge that inspired a creative solution.
Concept and Inspiration The initial concept for the device emerged from the idea of a marble run, which was further inspired by a video recommended by David featuring Wintergatan's Marble Machine. This machine not only functions as a musical instrument but also demonstrates the potential for precision and stability in a marble run system. This revelation reinforced the viability of developing a timing device based on the marble run concept.
Design Process and Techniques
The original design envisioned a composite structure with a track starting from a conical top, leading the marble into a bag, then onto a spiral track, and finally dropping into a cup. To create the tracks, 3D printing was chosen for its versatility and precision. However, it was quickly discovered that the spiral track accelerated the marble too fast, failing to achieve the desired 30-second duration.
A key turning point was the realization that the smaller steel marbles available at the maker hub could safely roll on a laser-cut track made from 1/4 inch thick wood. This insight led to the redesign of the marble run with flat tracks to lengthen the duration.
Modifications and Refinements
To further extend the timing, a reversible track design was considered, allowing for a new run after a flip. However, after adjusting track incline, length, and folding, an optimal incline was found that balanced minimal tilt with preventing the marble from stopping due to friction. Surprisingly, the first test on a thick wooden board measured exactly 30 seconds, leading to the abandonment of the reversible concept in favor of perfecting the track incline for precise timing. The ideal incline was determined to be 34.5 degrees.
Challenges and Solutions A significant challenge was encountered with the 3D printed base for the track, which failed due to material jamming. As a contingency, a simple base was constructed using woodworking techniques. Not as stable, this makeshift base resulted in the marble rolling for 28 seconds in final tests, slightly short of the 30-second goal.
The development of this timing device required innovative thinking and adaptability. Through a process of trial and error, including adjustments to design and overcoming material constraints, a nearly precise timing mechanism was achieved without the use of electronic components. This project underscores the potential for integrating traditional mechanical principles with modern fabrication techniques to create novel devices.
(Various creative timers from our class)