Semester Project – Vacuum Capsule-Based Clock Winding System

1. Introduction

Mechanical desk clocks rely on periodic manual winding to store energy in their mainspring. This project explores the use of a vacuum (Vidie) capsule as a passive actuator to provide torque for winding, reducing or replacing the need for manual intervention. The vacuum capsule, which deforms under atmospheric pressure changes, has historically been used in instruments like barometers. This project merges horological tradition with innovative actuation principles.

2. Goal of the Project

The goal is to design, simulate, and evaluate a vacuum capsule system capable of generating enough torque to wind a clock mainspring. The project includes feasibility analysis, mechanical modeling, and the fabrication of a proof-of-concept prototype. It is part of the broader EPFL Watchmakers initiative.

3. Required Background

• Interest in horology and mechanical systems

• Knowledge of mechanical design and actuation

• Experience in CAD and simulation (e.g., ANSYS, COMSOL)

• Familiarity with basic FEA and thermodynamic principles

4. Deliverables

• Final report detailing design, simulation results, and prototype evaluation

• Two oral presentations (mid-term and final)

• Parametric 3D models of the capsule and transmission system

• Manufactured proof-of-concept prototype

• Environmental analysis report based on EPFL pressure data

5. Administration

• Location: EPFL Associated Campus of Neuchâtel

• Section: IGM or related sections

• Contact: roland.bitterli@epfl.ch

6. Future Prospect

If the results are promising, a follow-up project will aim to integrate a custom capsule-based winding system within a complete horological movement.