In addition to being not totally accurate, the model is also not totally complete. That brass tube would also be glued to the brace, which is also fixed. The hairspray is an alternative to sealants, non-toxic and relatively cheaper plus it does a really great job. For example, metric 3,4,5,6mm etc, 1/32, 1/16. Thanks for any tips!PS. The cardboard rings are meant to depict the Asteroid Belt. Third from bottom, a 46-tooth gear drives another 46-tooth gear that’s attached to Earth’s axle. They drive the planetary tubes, to the right, of Mercury through Mars, which spin independently. This is so they are always the same distance apart. Question

At a later stage I will put together a pdf containing all of these. Reply Question Mine sits on top of a 3/32” rod at the center. I also cut out circles in this gear relative to the size of the planets because I wanted that represented somewhere, even if just decoratively. That gear needs to remain stationary. The gears need to have specific teeth ratios to ensure the planets move that the proper speed relative to one another. Dry fit the vertical supports and add the top plate. Planet size - I quickly found I couldn’t make the planets and sun proportional in size to each other. - A ring with an inner diameter of 15 cm - 6 inches and an outer diameter of 16 cm - 6 & 5/16 inches. ~ Kitty, Thanks for the design, your model is beautiful.I used it to create a CG version, you can view it here:https://www.youtube.com/watch?v=G98cUGuzzm0, http://www.theincredibletruths.com/ ... please read my blogs, Admin please contact with me, I need a help for my blog .. please mail me , mail id- swarnajyotibanerjee1971@gmail.com. How would you design and determine gear sizes? Note that the months should be COUNTERCLOCKWISE. Planet stalks and collars – The little arms and collar that the planets are attached to. In the center of each gear, you’ll need a hole that will snuggly fit your brass tube. Moving Saturn on the model, for example, requires 12 of the gears to all move together perfectly. My kids would love making this. To join the brass rods to the marbles, I used wooden golf tees. I drilled a hole the same diameter of the rod straight down the tee. The earth sits on a rod that slides into the moon's axle. Fixing the Earth Large Gear in its Bracket, http://3.bp.blogspot.com/_rwSxBTzspRQ/SqY20-U7pJI/AAAAAAAAABc/AcbKGxV8X9E/s1600-h/GearDiagram.GIF, The Earth remains at a constant axial tilt (of around 23 degrees), Brass tubing and rods of different diameters, available from. My current plan involves simply adding all of the planets above the largest gear and using stationary structures affixed to the base to hold the largest gear aloft. Certain plywoods don't take stain well because they are a combination of different materials that absorb stain differently. Everything fine with the painting?

Earth large gear bracket – A bracket where the earth large gear sits. Wouldn't be as pretty but would be an affordable (accessible) project for kids. It will be very difficult to reasonably make the planets proportional.

I reinforced those rods with a sheath of thicker brass tubing, which prevented much of the bending. Correct me if I'm wrong though, it has been a while since I worked with the materials. If you do have any questions, feel free to contact me at Murray Keir at gmail (I'm sure you can figure it out if you're not a bot). Consider paint or test your stain before using it on your cut pieces. Even on gears that spin at the same speed, the washer will maintain the proper spacing. Now for the Orrery.

I decided to building mine out of plywood because it was a material that was easy to work with given the tools I had on hand. It's very cool seeing everyone's different take on the design. I'll start by talking about the tools and materials that I used: I started by hitting the internet hard and seeing what had already been done. Wooden balls would be best. Then glue the three (B) cirlces on top of the two (C) circles and those onto the (D) circle to create the base of the orrery.

Make sure to post your photo on Hielke Rispens instructable as well. Well a little bit of paint can go a long way!! To make the brace, I used the same file as the top plate with a few changes: By now, you should have all the plywood parts cut: With all these parts, you can start assembling the main body of the orrery. That 16 tooth gear drives a second 40-tooth gear, which also shares an axle with a 16-tooth gear. I stained all my gears to make them look less like cheap plywood. To do this, I cut half the tube off from the end to about 1 cm along. Note: The moon rotates around the earth once every 27.32 days.
(X teeth)*(9/146) = Y inches in diameter. When ordering the brass tubes, do the wall thicknesses matter? Is it indeed better to use a 37 tooth gear in place of the 40 tooth once.? This design is also scalable, so it can be as large or as small as your materials will allow. That is, they have very small angular velocity that's difficult to observe in an orrery. 18/74 = 0.24. Now you take your little spheres and sand them with the sandpaper so the paint can stick better. Crayon Terrazzo: How to Make Better Art With Science. This means when the tube spins, friction will ensure the collar spins, but when I want to reset the planetary positions, I can just move them easily. I’m sure someone in the comment section will correct me if I’m wrong. Did you make this project? Mercury orbits the sun in 88 days or 0.24 years. I especially like that it's pretty simple to make. All the tubes should end at that the top plate except for the tubes that hold the planets, they should extend through the top plate.The rods and tubes that go through the center of the top plate need to be long enough to not only protrude through the top of the top plate, but also continue on to each have an exposed 0.5 inches of brass. Mars then spins the next gear tree which in turns spins the final gear tree, far right, which in turn passes back to a free gear on the previous gear tree. Some of the gears have bores larger than the tube they are meant to be attached to. Draw up each gear in gear generator (http://geargenerator.com/), Import that svg file into my CNC program (or laser cutter or 3D printer). Unless you’re like the Michael Phelps of the scroll saw perfectly cutting 19 small gears with almost 900 total teeth is probably more frustrating than possible. Make sure you are keeping the spacing between the axial equal or adding another axial in a different position to keep the gears meshing well. To make the moon rotate around. It's purpose is to prevent the 146-tooth gear from spinning. Take the base and slide in everything in order: And so you have your own Orrery to display and observe! The gears to need to be in a precise location. For the top plate, I used the same CNC file with four changes. The design relies on custom cut gears, which need to be perfectly centered, symmetrical, and have identical teeth. What to use for planets? They have the same angular velocity. The 146 gear, the one with the months engraved in it, is only there to make the earth's moon spin around the earth. I know that the brace is supposed to perform this function, but I'm not quite sure how that works specifically.

The end result should be something like the pictures above. Just starting the design process and this is a great project for inspiration. Did you make this project? The main point is that it have two levels.

I don't, for instance, tell you exactly how long to make the tubes or how much to space the gears. This will require two more stacks of gears. Nearly all the gears (except for the 146 and 11 tooth) are sandwiched between a top and bottom plate. Close enough to that the teeth mesh but not so close that they bind. The sun would be the largest object but not as large as it should be. The 146 tooth gear spins the 11 tooth gear which spins the small moon arm. Notice also that all the tooth combinations add up to 92. The gears are the heart of the orrery. The 11-tooth gear can have any size tube. I then made a collar, one tube size up, and into this glued a small piece roughly the size of the one I had cut off. Reply You could so use beads, wooden balls, custom make planets from clay, or purchase plastic models.

7 months ago. This spins a smaller gear which is attached to the moon, causing it to rotate around the earth. Feel free to use these as you would, I ask only that if you do use these instructions and make an orrery that you send me some photos. I have no experience with mechanics or building but I am determined to do this. If you are using a material that you can drill into, you can skip the golf tees and stick the rods directly into the planets. 10 months ago, Please excuse my ignorance: but I don't get it: doesn't have 146gear to be fixed? Attached are some modified plans I drew out including tube telescoping mechanism. This stacked set of drive gears spins, but they do not move relative to each other. Instead of indents for the axles and vertical supports, the brace requires holes all the way through the material because all the axles run through the brace.They can be in the same location and the same size as the indents on the top plate though. To be clear, all the gears should be able to spin. Thank you for checking out this Instructable, hope it helps! Instead, I resolved to have them represented in size order, but not proportional. Well, that's the plan. Share it with us! The device accurately depicts where the earth is with respect to other planets, the sun, and the moon and how they move relative to one another. Solder on Venus and Mercury's planetary arms and add the planets to the end of those arms. Participated in the Full Spectrum Laser Contest 2016. The one for the yard would span 10' at it's largest point and move on its own. This isn't perfectly accurate. Both plates hold all the axles in position. Earth arm – The collection of gears, rods and sprocket with the earth and moon attached. The inside and outside diameter is what is important. If someone wanted to include our moon on their model and they wanted it to orbit, then they would have a fixed 146 toothed gear glued to a brass tube.
Places like Woodcraft usually have a variety of sizes of wooden balls up to 2 in diameter.

As the earth's axle rotates (driven by the gears between the plates), it moves the arm around the outside of the 146-tooth gear. Question 1 year ago. And if so - how did you prevent it from spinning around? That rod should drop into the indent on the base plate. For me, I found the distance between the axles needs to be the sum of the radii of the gears minus 0.125 inches.


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