Vex+Curriculum

   http://curriculum.vexrobotics.com/curriculum/mechanical-power-transmission/gear-ratios
 *  [|Curriculum Lesson Content]
 *  [|Unit 1: Introduction to Engineering]
 *  [|Unit 2: Introduction to Robotics]
 *  [|Unit 3: Introduction to VEXnet]
 *  [|Unit 4: Introduction to Autodesk Inventor]
 *  [|Unit 5: THE GAME!]
 *  [|Unit 6: Object Manipulation]
 *  [|Unit 7: Speed, Power, Torque & DC Motors]
 *  [|Unit 8: Mechanical Power Transmission]
 *  [|8.1: Introduction]
 *  [|8.2: Power Transmission]
 *  [|8.3: Gear Teeth & Pitch]
 *  [|8.4: Gear Ratios]
 * <span style="font-family: inherit; font-family: inherit; font-size: inherit; font-size: inherit; vertical-align: baseline; vertical-align: baseline;"> [|8.5: Motion Reversal & Idler Gears]
 * <span style="font-family: inherit; font-family: inherit; font-size: inherit; font-size: inherit; vertical-align: baseline; vertical-align: baseline;"> [|8.6: Compound Gear Reduction]
 * <span style="font-family: inherit; font-family: inherit; font-size: inherit; font-size: inherit; vertical-align: baseline; vertical-align: baseline;"> [|8.7: Other Types of Reductions]
 * <span style="font-family: inherit; font-family: inherit; font-size: inherit; font-size: inherit; vertical-align: baseline; vertical-align: baseline;"> [|8.8: Applying Gear Ratios to DC Motor Systems]
 * <span style="font-family: inherit; font-family: inherit; font-size: inherit; font-size: inherit; vertical-align: baseline; vertical-align: baseline;"> [|8.9: Arm Design]
 * <span style="font-family: inherit; font-family: inherit; font-size: inherit; font-size: inherit; vertical-align: baseline; vertical-align: baseline;"> [|8:10: Modeling an Articulating Scoop]
 * <span style="font-family: inherit; font-family: inherit; font-size: inherit; font-size: inherit; vertical-align: baseline; vertical-align: baseline;"> [|8.11: Formulas]
 * <span style="font-family: inherit; font-family: inherit; font-size: inherit; font-size: inherit; vertical-align: baseline; vertical-align: baseline;"> [|8.12: Engineering Notebook]
 * <span style="font-family: inherit; font-family: inherit; font-size: inherit; font-size: inherit; vertical-align: baseline; vertical-align: baseline;"> [|Unit 9: Drivetrain Design]
 * <span style="font-family: inherit; font-family: inherit; font-size: inherit; font-size: inherit; vertical-align: baseline; vertical-align: baseline;"> [|Unit 10: Lifting Mechanisms]
 * <span style="font-family: inherit; font-family: inherit; font-size: inherit; font-size: inherit; vertical-align: baseline; vertical-align: baseline;"> [|Unit 11: Systems Integration]
 * <span style="font-family: inherit; font-family: inherit; font-size: inherit; font-size: inherit; vertical-align: baseline; vertical-align: baseline;"> [|Unit 12: Testing and the Iteration Process]
 * <span style="font-family: inherit; font-family: inherit; font-size: inherit; font-size: inherit; vertical-align: baseline; vertical-align: baseline;"> [|Unit 13: Design your Own Part [optional]]
 * <span style="font-family: inherit; font-family: inherit; font-size: inherit; font-size: inherit; vertical-align: baseline; vertical-align: baseline;"> [|Appendices]
 * <span style="font-family: inherit; font-family: inherit; font-size: inherit; font-size: inherit; vertical-align: baseline; vertical-align: baseline;"> [|Teacher Materials]