Subject:
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Re: Orrery gear train
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Newsgroups:
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lugnet.technic
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Date:
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Wed, 3 Apr 2002 03:45:38 GMT
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Viewed:
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619 times
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Don,
check out Robert Munafo's geartrain table!
http://home.earthlink.net/~mrob/pub/lego/gears2.html
Regards Chris
In lugnet.technic, Don Rogerson writes:
> I'm building an orrery and came up with this gear train for the earth and
> moon. The ratio is 1:27.7777 which is as close as I could come to the actual
> orbit of the moon, which is 27.32268 days. That's about 1.6% difference, or
> about 11 hours over the course of a month. I would be interested in your
> comments, and especially if anyone can approach the ratio more accurately.
>
> This link is to a .dat file showing just the gear train. The axle extending
> through the differential housing at top drives the earth, and the 1x8 plate
> driven by the diff. housing represents the moon.
>
> http://www.donrogerson.com/bricks/lunardrive.dat
>
> this is a .dat of the gear train in the frame
>
> http://www.donrogerson.com/bricks/orrery.dat
>
> Don Rogerson
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Message has 1 Reply:
 | | Re: Orrery gear train
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| (...) I wondered as I was working out my own table if someone hadn't already done it! Very useful (it needs an addendum to include the 56-tooth turntable) He uses old 14-tooth bevel gears back-to-back in several trains. I'm having to make do without (...) (22 years ago, 3-Apr-02, to lugnet.technic)
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Message is in Reply To:
| | Orrery gear train
|
| I'm building an orrery and came up with this gear train for the earth and moon. The ratio is 1:27.7777 which is as close as I could come to the actual orbit of the moon, which is 27.32268 days. That's about 1.6% difference, or about 11 hours over (...) (22 years ago, 3-Apr-02, to lugnet.technic)
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