Watch a countdown to oblivion. - Contractor UK Bulletin Board

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OwlHoot replied

22 November 2013, 11:54
Originally posted by zeitghost

http://www.smithofderby.com/assets/D...ming+Sound.pdf

Just looks like a fecking big magnet & a plate to me.

It would be a piece of piss to design an electromechanical bell ringer though. All you need is an offset weight which a motor turns via a ratchet on a central axis. When it reaches the top of its turn it drops down and moves the clapper via an elliptical shaped cam to strike the inside of the bell, and then the weight starts climbing again ready for the next strike, and so on.
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OwlHoot replied

22 November 2013, 09:40
Originally posted by zeitghost

Followed by ding dong bell:

How do you ding a gong automatically? | General | An Engineer In Wonderland

HTF does that mechanism work then?

Looks like a the large cyclinder on the lower left is steadily rotated clockwise (away from the vertical) by a motor, until at some point it suddenly falls back and causes the hammer to strike the bell.
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zeitghost started a topic Watch a countdown to oblivion.

22 November 2013, 09:30
Watch a countdown to oblivion.

I can't believe someone makes... Life expectancy watch | I can't believe someone makes... | Made By Monkeys

Sic Transit Glorious Mondays.

Or sommat.
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