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Mechanical / Wind up - 60 minutes timer Answered

Hello guys,

I am planning to do one project where I need to use mechanical timer - or better said mechanism. It needs to run for 60 minutes and it does not need to be really precise. So +/- 5 minutes is not a problem. Now... the main "problem" bothering me is the size of this mechanism. Maximum diameter of the mechanism should be under 3.5cm and maximum thickness can be 2.5cm.. This is why I can not use mechanical mechanism from kitchen timer. Because it is too big. (diameter of around 5.5cm or even more).. I have been thinking of mechanism from wind up toys since it is really small.. Is there any way to modify it? Does anybody have experience with this? I have been thinking also of using damper and spring... The other requirement is that it needs to be cheap (which means under 5$), that is why I can not use mechanism from watches. Basically what I would need is the same mechanism you can get in kitchen timer, but it needs to be smaller. Now I do not care with which technique or mechanism we achieve this. It just need to run for 60 minutes and it needs to be mechanical. Can anybody please help me with suggestions on how to make this work?

Thank you everybody in advance!

Best Regards, Luke

Discussions

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Jack A Lopez

26 days ago

Sometimes an image search can help, like, to kind of show what is out there. For example, here is an image search, at DuckDuckGo, for "tiny wind-up kitchen timer"
https://duckduckgo.com/?q=tiny+wind-up+kitchen+tim...

Curiously, I had to include the word, "kitchen", otherwise it was just showing me old-style clocks; i.e. the kind with 12 hours, evenly spaced around a circle, for telling the time of day.

Anyway, some of them look kind of small. E.g. some are egg-shaped, and possibly made to be close to the same size as a chicken egg.

Regarding this notion of adapting a windup toy, I do not know much about clockwork, but I do recall the name of the mechanism that connects the mainspring to the resonator (e.g. a pendulum, or mass-spring oscillator) for to kind of "count off" the clicks (i.e. periods or half periods of the resonator). That mechanism is called an, "escapement".

https://en.wikipedia.org/wiki/Escapement


I don't know how much help that will be to you. It might be kind of a big leap between merely knowing what the mechanism is called, and building your own tiny, workable clock.

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LutzS3

4 weeks ago

The problem is that you are not able to find that tiny pieces on the market.
Please if anybody can find this please paste link here in the topic. I will really appreciate it!
I still need help with this..

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Downunder35m

5 weeks ago

If you can find a suitable reduction gearbox or make an airbreak:
Motors for hot whhels cars are tiny....
Am certain they can be misused somehow....

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LutzS3

5 weeks ago

yeah it is too big. This is why I posted this topic... If somebody maybe know the solution to this? I would really appretiate it. Thanks for your answer @Yonatan24 though...
Anybody else have solution to solve this?

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Yonatan24

5 weeks ago

Those twist-kitchen timers hmmm... You could glue a spring onto it which will come in contact with a piece of metal when you twist it and let go as soon as the time goes back to 0...

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Yonatan24

5 weeks ago

I just salvaged a mechanical/ticking timer from an old standing fan.120min. About 5x5cm. Mayeb search for one on eBay, but it'll probably be too big.