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Strong Egg Timer mechanism? Answered

I want to a mechanism that turns a drum very slowly for a few hours.  It should work just like an egg timer: You wind it up and then it turns slowly. Is there mechanism available that works like this or do I have to built it from scratch?

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steveastrouk (author)2013-05-06

You'll need to put some quantities on "a few hours" - how many ?
"A drum" - what size ?
"Slowly" - how slow ?

A weighted clock type drive would be simple enough.

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uwe999 (author)steveastrouk2013-05-06

good questions, thanks.
The drum should turn about 1x per minute or less and should run for up to 8 hours.
The drum is 2 ft in diameter and needs about 5 ftlbs max to turn.

Where can I get a "weighted clock type drive"?

cheers

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steveastrouk (author)uwe9992013-05-06

I may be wrong, but I reckon you're going to have to do it from scratch, if its the way you want to go. Its basically a pendulum clock.

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rickharris (author)steveastrouk2013-05-06

There are many speed controlling mechanisms in the clock work world.

From swinging balls to fans.

Smart grease is also a good option depending on how slow you want it to go and how variable it needs to be.

http://www.rapidonline.com/Education/Smart-Grease-Starter-Pack-06-1294/?sid=9ea25341-8288-46cb-90ca-c9b1d2112ed0

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steveastrouk (author)rickharris2013-05-06

I'm thinking that "fans" and "grease" are energy lossy though, but an escapement isn't

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