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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Thu, 4 Apr 2002 01:25:27 GMT
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Viewed:
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665 times
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Hi Don,
If your gear train does not require too much torque, you could try using two
rubber wheels as bevel gears. By having one tire ride on the face of the
other wheel, you can get any fractional ratio you want. I've once seen a car
in a museum that used this principle to create a continuously variable
transmission...
Greetings,
David
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 is in Reply To:
 | | Orrery gear train
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| 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 (...) (23 years ago, 3-Apr-02, to lugnet.technic)
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