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In lugnet.build, Phillip Thorne wrote:
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In lugnet.build, Leonard Hoffman asked:
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Right now I’m planning on building a large “science factual” spaceship with
a rotating centrifugal-gravity hab-ring. ... hints/suggestions/how-to for
powering the rotating section.
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Alas, the Technic toolkit has nothing in the way of planetary gears, or a
means to do coaxial shafts. But if you’re willing to do brick-modding, you
could carve out the center of a 48-tooth gear (so it can free-spin, but
roughly); then pin it to a beam (to provide a smooth edge) and thread the
pair onto an axle, which would be fixed to the ship’s nonrotating section.
You could then drive the 48-tooth with a spur gear (or several) run parallel
to the spin-shaft. (This is speculation.)
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There are a couple of option without resorting to mods:
| | Use a large technic turntable. This is probably preferable, as the ring will be large and it will give you a better mechanical advantage, and allow a much more sturdy connection through the centre. Note there is a new studless version now too.
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| | Use a small ring gear. This can be used with a technic plate to drive the ring, but is a much smaller gear. Depending how big the model will be, it may be an option though.
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I’ve considered the same problem now and then, with regards to SF replicas:
an (unfinished) “2001’s” Discovery and an (unstarted) “Babylon 5”
Omega-class Destroyer. And Joe Meno wants to see some visually distinctive
original designs for microscale spaceships, so a similar problem applies; but
with less weight.
The Discovery’s centrifuge can’t have an axle down the center -- the
transfer shaft is there. I was considering an arrangement of tires (bearing
stand-ins) rolling in a race built of 1x5x4
arches and
inverted arches.
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Note also that the motor doesn’t have to be in the main body - if it’s to be
battery powered it can be in the ring.
ROSCO
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