Optimal hammer design and placement will provide maximum contact with the feed ingredient. Hammer mills in which the rotor speed is approximately 1,800 rpm, should be using hammers which are around 25cm (~ 10 inches) long, 6.35cm (~2.5 inches) wide, and 6.4mm (0.25 inches) thick.
For the labor union, see International Brotherhood of Teamsters. Teamster driving a team of six horses at the Oktoberfest in Munich, Germany. A teamster, in modern American English, is a truck driver, or a member of the International Brotherhood of Teamsters, a labor union in the United States and Canada. Originally, the term teamster referred to a person who drove a team of draft animals, usually a wagon drawn by oxen, horses, or mules.
The tubs and the coal could weigh over 600kg, and would have to be moved through roadways which were often only 60-120cm high. Getters were the oldest and strongest members of the family, almost always grown men or strong youths. Their job was to work at the coal face cutting the coal from the seam with a pickaxe. Getters were the only members of the family who would work continually with a candle or safety lamp, as they needed the light to see the coal face. Activity ideas: