Old Case Hammer Mill.Mar 19, 2011 . Grinding up some flax screenings for cattle feed with the old Case hammer mill and Cockshutt 40 tractor on the belt.old case hammer mill,Grinding Feed on a Vintage Case HammerNov 12, 2016 . This was a really cool blast from the past. My great grandfather purchased this hammer mill back in the 1930's or 40's to grind feed for his dairy cattle. As a kid I remember grinding feed on that hammer mill every Saturday morning. We had it mounted to the floor in grandpas grainery and we would hook up.