Uploaded October 2020 | Updated September 2026, 2 weeks ago
This calendar automatically keeps the day of the week correct for a year, from March 1st to the end of February in the next year. Contrary to the incremental mechanism of perpetual calendar in fancy mechanical watch, any drum can be rotated arbitrarily to any direction (CW and CCW), endlessly.
This calendar consists of three planetary gear sets inside to keep the relationships among four drums. Detailed principle can be downloaded from Thingiverse.com with 3D data.
thingiverse.com/thing:4639361
My works on digital fabrication:
shiura.com/dfab/index-en.html
Please subscribe my YouTube channel if you like!
This calendar automatically keeps the day of the week correct for a year, from March 1st to the end of February in the next year. Contrary to the incremental mechanism of perpetual calendar in fancy mechanical watch, any drum can be rotated arbitrarily to any direction (CW and CCW), endlessly.
This calendar consists of three planetary gear sets inside to keep the relationships among four drums. Detailed principle can be downloaded from Thingiverse.com with 3D data.
thingiverse.com/thing:4639361
My works on digital fabrication:
shiura.com/dfab/index-en.html
Please subscribe my YouTube channel if you like!
