Planetary Gear System

Introduction: Planetary Gear System

Planetary Gear systems were used in 500 BCE by the Greek to model the rotation of the planets around Earth, A Planetary Gear system use a Sun/Main Gear surrounded by Planetary Gears or secondary gears that rotate around the Main gear within an internal Gear. This type of gearing is sometimes used in tractors and construction equipment to provide high torque to the drive wheels. In bicycle hub gears, the sun is usually stationary, being keyed to the axle or even machined directly onto it. compared to conventional gearboxes and Planetary gear system has smaller dimensions, Greater Durability, High transmission ratio, Higher Gear Ratio.

Step 1: Equipment

You will need Fusion 360, a Laser Cutter, 2 motors, some wood glue and some cheap wooden chopsticks.

Fusion 360

Laser Cutter,

Step 2: Math Behind Gears

This is quite complicated to understand and get right on your first attempt, The ratio of the Gears must be correct or your gears will become jammed or fall out of place.

Step 3: Fusion 360

Fusion 360 is a 3D CAD/CAM tool for product development that combines industrial and mechanical design, collaboration, and machining in a single package. Fusion 360 enables fast and easy exploration of design ideas with an integrated concept-to-production platform. By Using Fusion 360 we are able to create Models of what we plan on making, I recommend using tools such as geargenerator.com to fiddle around with designs until you are happy, GearGenerator is free to an extent and can help you with the complex math and design challenges If you wish you can expedite the process by paying for the Direct file from Gear Generator. However, you can do it for free by modeling in fusion 360 after the dimensions provided by GearGenerator for Free.

To understand Fusion 360 further watch this video https://www.youtube.com/watch?v=xlho1DjwCbc

Step 4: Lasercutting Gears

Towards the end of your Fusion Experience, you need to export your files in SVG format to prepare for Laser cutting, as you can see in the images above this is how you should format you Planetary gears, One with the gears and the Internal Gear, and a backplate to hold the gears in place. if you encounter difficulty with this area you can edit SVG files easily using Inkscape or Affinity Designer

Step 5: Combining the Pieces

use the tip of the chopsticks as legs for the base plate of the planetary gear system. attach the corresponding gear to each chopstick. Once the gears are in place check for friction between the gears. if you have an imperfect cut or have miscalculated the math behind the gears they may fall from their sockets and slide against each other. if this happens, revisit the math between your internal stationary gear and your external rotating gears. recut the board with stronger settings. place the working pieces in place and cut the chopstick attached to the middle gear in half. attach a servo motor to give it spin. depending on the strength of your servo and the dimensions of your gears your distance traveled with the gears should have increased by a figure of 5 squared.

good luck. i recommend using this product to create moving figurines as i had intended to do before my workspace was shut down for quarantine.

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