Hammer mills work on the principle that most materials will crush, shatter, or pulverize upon impact. Material is fed into the mill's chamber through the feed chute, typically by gravity, where it is struck by ganged hammers attached to a shaft that rotates at high speed inside the mill's grinding chamber. The material is crushed or shattered by a combination of repeated hammer .
Video of the Day: Russian Combat Suit. A hightech Russian research center has been developing nextgeneration combat suits for their arms, and they have come up with something that looks straight out of GI:Joe. Many are comparing them to Star Wars suits also, and if they provide as much functionality as they do cool factor, Russia's enemies.