A Custom Mechanical Cam for a Helio-Chronometer Sundial
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A mechanical implementation of an EoT adjustment system consisting of a custom cam instead of an analemma curve.
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Updated at source:
Model information
- Source
- Printables
- Category
- Mechanical Parts
- License
- Creative Commons — Attribution — Noncommercial — Share Alike
This cam is part of the P&G Helio-Chronometer design described at: https://www.printables.com/model/1542266-working-replica-of-an-early-20th-century-pilkingto
The cam was derived mathematically using the spreadsheets in the link provided below. The input parameters can also be modified so that someone can develop their own custom cam designs: https://drive.google.com/drive/folders/1-8d7HC8gH5ODaASLF8Njl1xOkzFsHQeT?usp=sharing
A 3D cam (STL) can then be generated using the Python script at: cam_csv_to_stl.py
Follow the instructions in the readme file, provided in the link above.
REFERENCES
1. British Sundial Society Bulletin, Volume 38(i), March 2026, MAKING A WORKING 3D PRINTABLE REPLICA OF THE PILKINGTON & GIBBS HELIO-CHRONOMETER, MARC NADEAU.
2. British Sundial Society Bulletin, Volume 18(ii), June 2006, A REVIEW OF THE HELIOCHRONOMETERS BY PILKINGTON & GIBBS, Part 1. The design and accuracy of the Gibbs Helio-Chronometer, GRAHAM ALDRED.