Chainsaw Dissection

Hundreds of moving parts work together to give a chainsaw its precision and power. One of the most vital parts is the guard rail--the flat piece of metal that the chain runs around. See how this integral component is manufactured to be light and rugged. Don't miss new episodes of MACHINES: HOW THEY WORK Thursdays at 10/9c on Science! http://www.sciencechannel.com/tv-shows/machines-how-they-work/ Subscribe to Science Channel: http://www.youtube.com/subscription_center?add_user=sciencechannel Check out SCI2 for infinitely awesome science videos. Every day. http://bit.ly/SCI2YT Download the TestTube app: http://testu.be/1ndmmMq