Gears & VEX Agenda Essential Terminology Gear Types Gearing Up/Gearing Down Direction Gear Ratios Example Application: Sumo-petition gear testing apparatus Essential Terminology Driver – gear attached to a motor Follower – gear doing useful work Idler – gear between the driver and follower Gear Train – a row of gears Geared Up – the follower moves faster than the driver Geared Down – the follower moves slower than the pound gears – a gear train with multiple gears on one axle Do you get it? Which gear is the driver (A or B)? Which gear is the follower (A or B)? A B motor Do you get it? Which gear is the driver (A or B)? → A Which gear is the follower (A or B)? → B A B motor Do you get it? Which gear is the follower (A, B, or C)? Which gear is the driver (A, B, or C)? Which gear is the idler (A, B, or C)? A B C motor wheel Do you get it? Which gear is the follower (A, B, or C)? → C Which gear is the driver (A, B, or C)? → A Which gear is the idler (A, B, or C)? → B A B C motor wheel Gear Types spur gears differential bevel gears rack & pinion worm gear Spur Gears 84 tooth 60 tooth 36 tooth 24 tooth 12 tooth Worm Gears worm gear Worm gears allow axles at right angles to transfer rotational motion.