Introduction

Collaborates with OSE Clubs - the Open Hardware Enterprise Club.
Introduces the concept of open source product development
This module teaches you how to design and make geardowns for various applications using 3D printing and design software.
Outcomes:

Learning about mechanical advantage, force, torque, speed, efficiency, and power
Hands-on understanding of torque via Torque Measurement], rotational speed measurement (Arduino Tachometer), and Rotational Power Calculation.
Gaining hands on experience with collaborative product development
Learning CAD design in FreeCAD, including using part libraries from OSE and external sources, and being able to modify and create files in a snap
Ability to generate files for printing
Ability to design a functional gear of any geardown ratio.
Ability to demonstrate the correct functioning of such gears in practical situations from cranks, motors, to winches.

Planetary Gears

Why gears? Give me a lever long enough, and I shall move the world.
Why planetary gears - compact and easily stackable form lends itself to many applications. See Curriculum - Grinder
3D Printer - for parts printing
Lesson 1 - Using Wiki and Google Docs for documentation and collaboration.
Exercise 1 - Create a Template
Lesson 2 - theory of Planetary gears. Force, torque, speed calculations. 1 hour
Lesson 2 Group or Individual Exercise in Google Docs - Find the torque and speed on a sample gear with 1" sun, 4" planets when driven with the Open Source Cordless Drill. Document on Google Doc Gear Calculation Spreadsheet.
Lesson 3 - Open source planetary geardown generation in OpenSCAD
Lesson 4 - FreeCAD design
Lesson 5 - Using, finding, and modifying parts in FreeCAD by using OSE and other part libraries
Lesson 6 - Designing and building a 3D printed space frame that can hold 500 lbs
Lesson 7 - Designing and building a 3D printed winch. See Geardown for What
Lesson 8 - Mechanical advantage. Winching people up with a cordless drill
Lesson 9 - Designing a geardown for a cordless drill-driven mixing auger.
Lesson 10 - Understanding materials limits of plastic. Building a functional 1000x geardown.
Lesson 11 - Applying a geardown to a grinder for grinding plastic waste. 3D Printed grinder

Planetary Geardown Wiki Page - has all templates
Exercises can be done singly or as a team.
Singly - students can take one page each of the Template
As a team, group of students can work on the same document - up to as many students as needed
For teamwork, role allocation happens on first page of document with a graphical icon
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