Source link : https://www.thingiverse.com/thing:328569 Designer : https://www.thingiverse.com/TheGoofy Everything is 3d-printed (even the spiral spring), except e few small screws, some metal pins, the cord, and the lead for the weight. This video shows the clock and the building process (actually with a simpler ratchet-winding): http://youtu.be/HgZBPYJ2Y-w Designed with Blender. PLA printed with Rapman 3.2. Some parts require a loose clearance (hollow shaft for hours and minutes), other parts require a press fit (hands). The 3d-files are optimised for older printers with more inaccuracy in xy, or a badly guided z axis. I.e. when printed with a newer generation printer, parts are most likely too loose. In order to compensate this, the material flow could be increased (over-extrusion). In Simplify3d there is another useful parameter: "process settings / advanced / other / horizontal size compensation". Pins: 1 x Balance wheel: 1.5mm diameter, 40mm length 1 x Escape wheel: 2.0mm diameter, 28mm length 1 x Reduction gears: 2.0mm diameter, 60mm length 1 x Drum Transmission: 3.0mm diameter, 60mm length 1 x Drum Axis: 3.0mm diameter, 60mm length 1 x Crank transmission: 3.0mm diameter, 30mm length 4 x Planets Axis: 3.0mm diameter, 39mm length 1 x Weight Axis: 3.0mm diameter, 15mm length Screws: 6 x Frame: M3, 12mm, Flat Head 5 x Winding Drum: M3, 10mm, Flat Head There are STL-versions with 2 x 2 combinations for the winding: a) Simple Ratchet v1: 4.22 revolutions per hour (weight moves 26.5cm/h) b) Simple Ratchet v2: 2.25 revolutions per hour (weight moves 14.1cm/h) c) Planetary Drum v1: 3.01 revolutions per hour (weight moves 18.9cm/h) d) Planetary Drum v2: 1.61 revolutions per hour (weight moves 10.1cm/h) My clock works well with version c) and 1.2kg weight. For version d) I'd probably need a weight of 2.3kg. The actual needed weight depends a lot on the friction of the whole system.
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