The Working Principle of Hammer Mills (Step-by-step Guide .A hammer mill is an essential machine in the pharmaceutical and food processing industries. You can use it to crush, pulverize, shred, grind and reduce material.the principle of hammer mill,How Does a Hammer Mill Work? - SlideShareSep 23, 2014 . The basic principles of particle size reduction. Presentation includes a comparison of gravity and pneumatic discharge hammer mills, how.