Jun 10, 2019· They use these machines to dig and lift sand, gravel, or earth. Paving and surface equipment operators use machines to spread concrete and asphalt during the construction of roadways. Piledriver operators control equipment to hammer heavy beams of wood, concrete, and steel, called piles, into the ground.
Hammer mills use rotating hammer or knives to breakup wet or dry product that has been fed into the chamber of the machine. The rotating hammers or knives in the chamber of a hammer mill reduce the side of the product by impacting the product and by forcing .