Subject:
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Re: Technic Pendulum Clock progress
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Newsgroups:
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lugnet.technic
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Date:
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Sat, 25 Nov 2000 17:56:20 GMT
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Viewed:
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1443 times
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In lugnet.technic, Amnon Silverstein writes:
> I've been trying to make a practical Technic pendulum clock. I want it to
> run for 24 hours/winding, and to keep time to within 10 min/ day. So far,
> with 5 lbs of lead X 2 feet of drop, it runs for about 4 hours, so I have a
> ways to go. If there are any other clock builders who read this, I'd like to
> know other people's clock efficiency in hrs / (ft lbs). Mine has an
> efficiency of .4 hr/ftlb
> Here is a picture of what I have so far. It doesn't have any hands yet, but
> it has a winder that lets it be rewound while it is running.
> http://www.best.com/~amnon/Homepage/Games/clock1.jpg
Hi Amnon,
I know there are some clock design pictures here in LUGNET® somewhere.you might
try searching for "clock".
two things that might increase your time is a little more weight on the
pendulum and removing the pully on the lead weight. If I recall my pulley
physics correctly, by having that pulley there you are reducing the weight
transmitted to your clock motor by half. Ie, the weight is distributed by the
anchor on one side and the cable winding mech on the other.
http://www.best.com/~amnon/Homepage/Games/Lego/escapement.jpg
I found this link (provided by Chris Magno) to a picture that shows this setup.
http://news.lugnet.com/org/ca/rtltoronto/?n=114
Chris's original post
hers one from Zef Damen
http://news.lugnet.com/build/?n=4533
and Eric Harshbarger's very nice grandfather clock : )
http://news.lugnet.com/general/?n=13919
I hope this helps : )
John
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Message has 1 Reply:
 | | Re: Technic Pendulum Clock progress
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| John, I have seen these two other clocks, and a few electric Lego clock designs. I went back to these pages, and I found out that they do have enough information to calculate efficiency. I built an approximate copy of the Zef Damen clock's weight, (...) (24 years ago, 26-Nov-00, to lugnet.technic)
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Message is in Reply To:
| | Technic Pendulum Clock progress
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| I've been trying to make a practical Technic pendulum clock. I want it to run for 24 hours/winding, and to keep time to within 10 min/ day. So far, with 5 lbs of lead X 2 feet of drop, it runs for about 4 hours, so I have a ways to go. If there are (...) (24 years ago, 25-Nov-00, to lugnet.technic)
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