Subject:
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Tellurian Orrery MOC
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Newsgroups:
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lugnet.technic
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Date:
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Thu, 19 Jul 2001 22:30:27 GMT
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Viewed:
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804 times
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Dear all.
Remember this post? http://news.lugnet.com/robotics/?n=15627
Remember that I replied with a few pictures of Orreries and said that one
day I might have a go at one? Well, as I was at home this week to babysit
some builders working on my house I had some time and this is the result:
http://www.brickshelf.com/cgi-bin/gallery.cgi?i=56981
I am really pleased with this because it uses a feature of
http://guide.lugnet.com/partsref/search.cgi?q=6542 (Technic 16t gear with
clutch) that I don't think TLC have made use of in a set yet: the fact that
you can attach a steering arm and drive it concentrically to an axle at a
different rate.
I hope my maths is right (though it shouldn't be too difficult to rebuild if
it isn't) and if it is then the earth makes 375 revolutions for each
revolution around the centre (the sun, or as I call it the 'strange Y-wing
domey golf ball part') and 30 revolutions for each revolution of the moon
about it. This is the closest you can get to reality with the gears available.
As you can see the gear train is a bit bulky.
http://www.brickshelf.com/cgi-bin/gallery.cgi?i=56986 and it took a while to
make all the gears fit, particularly taking the moon drive off half way up
the train.
I don't have many different 1 wide black slopes or I would have made the
disc a much better approximation of a circle.
The only way to drive it was to drive the earth spindle as any other axle
just locked so I had to mount a micromotor and its battery box on the moving
arm. This has made it very heavy and therefore it sticks a bit. I may
rebuild it to improve the balance of the arm.
Other pics reside here: http://www.brickshelf.com/cgi-bin/gallery.cgi?f=5670
Please LMKWYT.
Thank you
Psi.
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