Subject:
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Re: Gear train friction?
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Newsgroups:
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lugnet.technic
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Date:
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Wed, 6 Dec 2000 08:59:34 GMT
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Viewed:
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2113 times
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In lugnet.technic, Amnon Silverstein writes:
> One of the tough problems in building a clock is to design a very low friction,
Hello, I stumbled across your posting about the continuos loop chimer and it
blew my mind. So I decided to join lugnut I'm also curently working on a
weight driven pendulem clock and I'm going to try to build your device. I
originaly tried to build a clock several years ago and I gave it up at the
escapment.Then I stumbled onto Leo's site. Anyway to overcome lack of
runtime, friction, and garbagy lego gear mesh, My friend and I concluded we
needed a slow running clock. Our logic was less rotations less friction. I
have a leo inspired escapent with 18 teeth conected to a second hand threw 5/3
ratio or 24t:40t.So the escapent turns once every 36 seconds with one second
between each tic and tock. Unfortunitly this set up requires a long pendulem
and therefor more freggin legos.I don't currently have a way to post any
pictures but I can e-mail some pics of the escapment to you if you would
like.I also think one solution to increase run time might be a powered
automatic winding system. It would utilize motors, polarity switches,a gear
drive with a rocker arm that enables one way rotation only regardless of input
direction,and a device to shut itself off when winding was complete(timer).
These devices do exist in one form or another at
http://public.surfree.com/werdna/lego.htm#legocad invented by Andrew Lipson
I'm looking forward to your conclusions on the turn tables.Also I noticed
the small gear doesn't mesh well. What do you think? well good luck to both
of us on 1:300
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Message has 1 Reply:
 | | Escapement efficiency (Re: Gear train friction?)
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| A 1 rotation/ 36 second escapement is going to be really tough. Mine is 1 turn / 8 seconds, and is is close to the edge of the reliability envelope. The big problem is that the escapement must come to a complete stop with every pendulum swing, and (...) (23 years ago, 6-Dec-00, to lugnet.technic)
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Message is in Reply To:
| | Gear train friction?
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| One of the tough problems in building a clock is to design a very low friction, very tall gear ratio drive. I want the spool to turn around somewhat less than once every half hour, and the escapement to turn once every six seconds, so I need around (...) (23 years ago, 4-Dec-00, to lugnet.technic)
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