Metal grinder according to their works can be divided into two types a biaxial or uniaxial low speed use the material for cutting cutter, cut, tear, pull. Straight worm gear motor mounted directly on the drive shaft shredder transmitted through the gear shift driven shaft so that the drive shaft and the housing of the stationary knife cutterhead formation relative motion. Initiative shaft helical cutter staggered so that the material being squeezed into the same time, tear, cut so that the materials are crushed role. Two high-speed rotation of the impeller to stir the metal chips long tear break-speed rotation (about 1000 r / min) of a series of multi-piece spindle round steel circular plate associated with the spindle. All around the circular plate fitted with four to six small cast manganese steel gear. In their small pinion shaft to rotate freely. Broken down according to the requirements of the particle size of the metal shavings and election chaos into a group of long metal shavings into the high-speed rotation of the machine are steel gear from the top port winch tearing into small pieces out of the bottom of the sieve mesh size fixed.