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/diy/ - Do-It-Yourself

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Anonymous 07/18/14(Fri)14:29 UTC+1 No.669465 Report

Does anyone have any experience with clockwork? I'd like to ask for some references, info or advice about working with the gears and clock set-up and all.

Basically I'd just like to make a table-top tellurion (http://en.wikipedia.org/wiki/Tellurion). The last time I've worked with gears was in my high school robotics class, so I get the basics of meshing and gear ratios and all that. I have a basic design for how the gears should be situated and the cosmological ratios they need to be to correctly simulate the periods of all rotations and revolutions, I just need to find proper, real gear ratios that meet these expectations.

But what I'm wondering specifically is what I need to take into account if I plan to have the parts custom made. Meshing, tooth size and other issues I'm probably ignorant about.

On top of that, how does one link it to a clock? Ideally I'd have a battery powered or something similar clock (which is the term I'm using since I'm used to working with digital systems), as opposed to a crank operated gear system.

If any of you could help me out here, I'd be wildly appreciative!
Anonymous 07/19/14(Sat)09:30 UTC+1 No.669828 Report

(Not really sure what the proper amount of time would be before bumping)
Anonymous 07/19/14(Sat)09:46 UTC+1 No.669829 Report

Check your watch, oh, yeah... never-mind.
Anonymous 07/20/14(Sun)11:42 UTC+1 No.670336 Report

Oh you sure got me haha!
Anonymous 07/22/14(Tue)12:09 UTC+1 No.671389 Report

Gonna throw this a one last bump before I let it die.
Ellie 07/22/14(Tue)15:55 UTC+1 No.671434 Report

>Gonna throw this a one last bump before I let it die.
>Thread CPR. Breathe squish squish squish Breathe squish squish ...

Do you want to hook it to a mechanical clock or drive it from one of the battery powered clock movements from your local craft store? Either way, step 1 is "Get a working clock".

I found this youtube video to be very educational.
The keywords you want to search for are clock escapement and movements
Also there are some helpful educational bits on WoodenGears.ca.

Your clock will have either a 12 or 24 hour hand, depending on the convention in your country. This is the base of your Tellurion clockwork mechanism.

For the Tellurion:
The earth's rotation is driven directly from your 24 hour wheel or 2:1 from the 12 hour wheel.
The Lunar cycle is a 29.5:1 reduction of the 24 hour wheel or 59:1 reduction of your 12 hour wheel.
The Earths revolution is 365.25:1 reduction of the 24 hour wheel or 730.5:1 of the 12 hour wheel.

If you want to add planets, you'll have to look up their orbital period on your own.

How you make the gears depends largely on how you want it to look. In my head I see this assembled with giant gears (many feet in diameter) in polished brass under a transparent floor of a black painted room with all light coming from a brilliant yellow orb sun and fiber optic pinpricks of light for the stars outside the solar system. For this scale , it's completely reasonable to do have a small 40 tooth 24 hour gear drive a massive 14610 tooth earth's revolution gear. What is your budget/ideal size?
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