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Brewtopian Space Progran
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DA3 Space Program (CAT 7), including a functional orrery.
About this creation


The Brewtopian Space Agency was set up almost a century ago with the goal of unlocking the mysteries of outer space. Unfortunately, because our telescope lenses are usually covered with beer foam, it has taken us all of that time just to discover the inner planets of our own solar system. Based on that knowledge, out scientists have constructed a working model of the solar system, an orrery.

Here is what our scientists currently know about our universe: The DA3 home planet, Planet Guinness, is the second planet from its sun in the Goldman system. Planet Guinness has a unique climate that causes a tan cloud cover in the northern hemisphere and a black one to the south. For this reason, Planet Guinness is sometimes known as the "Black and Tan" planet. Planet Guinness has one moon, the Barrett Moon, which makes almost 12 revolutions per year. Closer to the sun is Planet VAkkron, a verdant green planet full of interesting life forms. The Brewtopian Space Agency is actively trying to determine whether its atmosphere is suitable for growing hops. Due to the fact that Planet VAkkron is a captured planet, it orbits the sun in a direction opposite that of Planet Guinness.

[ I hope that was enough sucking up to the DAS to score a few brownie points. ]




Because I was building digitally, where it is a real pain to mesh gears together, I tried to go for a solution that involved as few gears as possible (which, hopefully, should make it easier for the DAS to confirm its functionality as well). There are two key elements in the design of this orrery:

  • A central gear train based on a large Technic turntable, with a 24-16 tooth differential going up through its center.
  • A simple, secondary gear train based on the large planetary gear set that came with the Bucket Wheel Excavator. This secondary gear train provides the motion for the moon without adding complication to the central gear train.


Here is brief description of how the orrery works, starting with a listing of the moving axles, and the gear ratios between them.

CENTRAL GEAR TRAIN

Axle 1: Crank
Axle 2: Vertical axle with stacked 24T and 40T gears
Axle 3: 8T idler gear between axles 2 and 4
Axle 4: Inner orbital axle (the differential)
Axle 5: Outer orbital axle (the outer section of the turntable)

There is a 16T gear that meshes with the 16T end of the differential (the top end). That gear is fixed to the pair of 4L half-thickness liftarms immediately above it (it cannot rotate with respect to the liftarm). It serves only to transfer the differential's rotation to the smaller, upper orbital arm. The gear ratios for the central gear train are as follows:

Axle 1 to Axle 2: 12:12 or 1:1
Axle 2 to Axle 3: 40:8 or 5:1
Axle 3 to Axle 4: 8:24 or 1:3 (0.33:1)
Axle 2 to Axle 5: 24:56 or 1:2.33 (0.42:1)

For every clockwise turn of the crank, the green planet revolves about the sun 1.67 times in the counter-clockwise direction and Planet Guinness revolves about the sun 0.42 times in the clockwise direction.

SECONDARY GEAR TRAIN

Axle 6: Vertical axle with 12T gear making contact with planetary gear
Axle 7: Horizontal axle near end of larger orbital arm
Axle 8: Vertical axle at end of larger orbital arm

Planetary gear to Axle 6: 140:12 or 11.67:1
Axle 6 to Axle 7: 12:12 or 1:1
Axle 7 to Axle 8: 12:12 or 1:1

The moon revolves around Planet Guinness 11.67 times for every revolution of Planet Guinness about the sun.



GEAR TRAIN PICTURE 1: The picture below shows orrery with most of the supporting framework removed. What is left is the gear train, plus the orbital arms.



GEAR TRAIN PICTURE 2: The picture below shows an even more stripped-down version of the orrery. The larger orbital arm is removed, except for the gears and the planet/moon at the end.



GEAR TRAIN PICTURE 3: The picture below shows the gear train from below, showing the idler gear that is part of smaller orbital arm's drive train.





For the sake of the following two positional examples, consider the starting position of the orrery to be shown in the following picture:





Turning the crank 90 degrees clockwise, the green planet will revole 150 degrees counter-clockwise (looking down) and Planet Guinness will revolve 38.57 degress clockwise. The moon will revolve about Planet Guinness 450 degrees counter-clockwise (i.e. retrograde motion). The following picture shows the position of the orrery after a clockwise 90-degree crank turn from the starting position (above).





Turning the crank 90 degrees counter-clockwise, the green planet will revole 150 degrees clockwise (looking down) and Planet Guinness will revolve 38.57 degress counter-clockwise. The moon will revolve about Planet Guinness 450 degrees clockwise (i.e. retrograde motion). The following picture shows the position of the orrery after a counter-clockwise 90-degree crank turn from the starting position (above).





And finally, the required picture of a downed space capsule being discovered by our military forces. A squad of Brewtopian commandos have discovered an alien space capsule containing gallons and gallons of the greatest substance known to man: BEER. The commandos are struck with awe and feel the need to enshrine this great discovery and bow to it - definitive proof that there is intelligent life out in the far reaches of the galaxy.





If you like this MOC,you might also like some of my other DA3 MOCs:




Comments

 I made it 
  June 2, 2018
Quoting Tom's MOCs Gallons of cold brew in a crashed alien space capsule. Yes. The only thing that could be better is a big plate of warm chocolate chip cookies to go with it ...
I can't say no to chocolate, either. Maybe we need some chocolate-chip-flavored beer.
 I made it 
  June 2, 2018
Quoting Kurt's MOCs Nice work!
Thanks. Technic in digital form is definitely a challenge, so I'm glad you like it.
 I made it 
  June 2, 2018
Quoting Clayton Marchetti Thatís ok, if it does Iíll come back again
Thanks.
 I like it 
  June 2, 2018
Gallons of cold brew in a crashed alien space capsule. Yes. The only thing that could be better is a big plate of warm chocolate chip cookies to go with it ...
 I like it 
  June 2, 2018
Nice work!
Mark B.
 I like it 
Patrick Boyle
  June 1, 2018
Great job!
 I like it 
  June 1, 2018
Thatís ok, if it does Iíll come back again
 I made it 
  June 1, 2018
Quoting Zach Sweigart A superb example of technical prowess. Awesome!
Thanks. Maybe not as creative as using train tracks, but I'm still pretty happy with the design.
 I made it 
  June 1, 2018
Quoting Doug Hughes Nicely done, the orrery is especially well designed!
Thanks. I had the advantage of having all of the neat parts at my disposal, especially the big gear, which definitely helped the design.
 I made it 
  June 1, 2018
Quoting VAkkron ô Statement of approval! Good luck reaccruing MILPO, mate.
Thanks. I'm glad it still qualifies. :-)
 I made it 
  June 1, 2018
Quoting Patrick Boyle Great job!
Thanks!
 I made it 
  June 1, 2018
Quoting Seaman SPb Excellent engineering!
Thanks. I have a pretty good Technic background, but it's so hard to do it in the digital domain.
 I made it 
  June 1, 2018
Quoting Clayton Marchetti Love the 2001 a space odyssey reference. Excellent work!
Thanks, again. I hope we won't have to go through this a 3rd time. :-S
 I made it 
  June 1, 2018
Quoting Stuart Lucas Welcome back to the site's finest digital orrery!
Thanks. Technic in digital is definitely no picnic. I'm anticipating some difficulty with the missile launcher for the same reason, even though I have a pretty good idea of how to implement the working features.
 I made it 
  June 1, 2018
Quoting Pico van Grootveld Spinning and beerkegs are a prefect combination!
The "spins" usually come a few hours after the kegs arrive.
 I made it 
  June 1, 2018
Quoting Werewolff Studios Now that is one hefty explanation for one fantastic beast of an orrery! Great stuff as always Mark!
Thanks. I figure that the hefty explanation was needed, since this is a digital entry. I wanted to make sure that the DAS understood how it worked.
 I like it 
  June 1, 2018
A superb example of technical prowess. Awesome!
 I like it 
  June 1, 2018
Nicely done, the orrery is especially well designed!
 I like it 
  June 1, 2018
Statement of approval! Good luck reaccruing MILPO, mate.
 I like it 
  June 1, 2018
Excellent engineering!
 I like it 
  June 1, 2018
Love the 2001 a space odyssey reference. Excellent work!
 I like it 
  June 1, 2018
Welcome back to the site's finest digital orrery!
 I like it 
  June 1, 2018
Spinning and beerkegs are a prefect combination!
 I like it 
  June 1, 2018
Now that is one hefty explanation for one fantastic beast of an orrery! Great stuff as always Mark!
 
By Mark B.
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LEGO models my own creation MOCpages toys shop Brewtopian Space Progran


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