1. Gears

2. Worm Drive 2 Parts – Worm – gear in screw form – Worm Gear – meshes with the worm to create a worm drive Perpendicular drive axes Direction of transmission not reversible Large gear reductions (20:1 – 300:1+) Changes direction of motion 90° Used in: gates, high-performance cars http://openmoco.org/article/selecting-gearing-your-motion-control-rig http://en.wikipedia.org/wiki/File:Worm_Gear.gif

3. Spur Gears Simplest and most common gear type Cylinder/disk with radially projecting teeth Teeth are straight and parallel to rotational axis Noisy, teeth under a lot of stress during each repetitive impact Used in: alarm clocks, washing machines, clothes dryers http://www.machsources.com/productimages/20923/40cr-spur-gear.jpg http://usa.autodesk.com/adsk/servlet/item?siteID=123112&id=10008317&linkID=9242016

4. Crown Gear Teeth project at right angles from the plane of the wheel Reasons for use: – Excellent heat distortion control, High strength, Wear resistance, Noiseless and vibration-free operation, Fixes Misalignment Used in high-stress junctions in cars Animated! http://upload.wikimedia.org/wikipedia/commons/3/34/Crown_gear.png http://www.zakgear.com/Scrown.html

5. Information Sources Worm Drive – http://science.howstuffworks.com/transport/engine s-equipment/gear5.htm – http://en.wikipedia.org/wiki/Worm_drive Spur Gears – http://science.howstuffworks.com/transport/engine s-equipment/gear2.htm Crown Gear – http://www.reliableplant.com/Read/22778/crowning- noise-reduction-gears