Hey! This thing is still a Work in Progress.
Files, instructions, and other stuff might change!
Planetary Gearbox Clock
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Published on May 9, 2011
This thing was Featured on May 13, 2011
Derived from
1:246 Gearbox
by emmett
Description
Also known as Clock-in-a-Cage!
WARNING! Since we still don't have a working escapement mechanism (see test jig #2 thingiverse.com/thing:8275 ), this is NOT a working clock, yet. Hopefully, it will be eventually. :-)
The Planetary Gearbox Clock is a collaboration with Emmett, who designed the original planetary gearbox and helped design and stack two of them with a 60:1 and 12:1 ratio respectively. I just slapped the escapement system on the back side and designed a cage-frame around it. The dove-tail snap-fit tabs for the cage I took from relet's excellent thingiverse.com/thing:6214 .
The intent was to do away with concentric shafts altogether, by putting the entire gear-train inside the shaft, as it were. The frame must hold the stator rings without interfering with the hands that stick out the side of the rotor rings, hence the cage design.
WARNING! Since we still don't have a working escapement mechanism (see test jig #2 thingiverse.com/thing:8275 ), this is NOT a working clock, yet. Hopefully, it will be eventually. :-)
The Planetary Gearbox Clock is a collaboration with Emmett, who designed the original planetary gearbox and helped design and stack two of them with a 60:1 and 12:1 ratio respectively. I just slapped the escapement system on the back side and designed a cage-frame around it. The dove-tail snap-fit tabs for the cage I took from relet's excellent thingiverse.com/thing:6214 .
The intent was to do away with concentric shafts altogether, by putting the entire gear-train inside the shaft, as it were. The frame must hold the stator rings without interfering with the hands that stick out the side of the rotor rings, hence the cage design.
Instructions
This is officially part of the Printable Clock Project and is being maintained on GitHub along with the rest of the code:
github.com/syvwlch/Printable-Clock-Project
The script posted here was used to generate the images, but the latest version will be on GitHub. Feel free to fork it and play with it, any improvements and/or variants welcome!
I will post STLs when it is ready for testing (not until we have a working escapement), and remove the WIP flag when someone has a print of it ticking properly.
github.com/syvwlch/Printable-Clock-Project
The script posted here was used to generate the images, but the latest version will be on GitHub. Feel free to fork it and play with it, any improvements and/or variants welcome!
I will post STLs when it is ready for testing (not until we have a working escapement), and remove the WIP flag when someone has a print of it ticking properly.
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emmett
on
May 9, 2011
said:
It turns out there are many tooth combinations to make a 12:1 gearbox, but only one with a reasonable number of teeth for 60:1. These teeth should all be printable as long as the ring gears fill up pretty much the whole 100mm platform and the bot is well-calibrated.
I'd really like to see a version printed with clear PLA for the ring gears and opaque for the planets so you can see them turning around inside.
MakeALot
on
May 9, 2011
said:
You may want to link your edge couplings together in some way at the centre or have some additional support across the whole clock as the radial arms will tend to make the central pieces splay out of the front/back of the clock.
License
Planetary Gearbox Clock by syvwlch is licensed under the Attribution - Share Alike - Creative Commons license.
More from syvwlch
Little proof of concept gif... I've been getting questions about how this work.
The gray ring is static. The red sun rotates once per minute. The green ring rotates once per hour (60 times slower).
I actually thought of designing one where the blue planets would give the minutes and the green ring would give the hours directly, with no need for a second gearbox... but the re
g/blue gear ratio would be too high, I think.
The color coding on the whole clock is:
Gray rings are static. Cyan escapement ticks the seconds. Red escapement wheel coupled with red sun rotate once per minute. Green ring and piggyback sun rotate once per hour. Blue ring rotates once per 12 hours.