The large DAVI roller is used to transform a flat plate into a round cylindrical shape.  Here’s how it works:

  • The three-roll variable pitch works by having all three rolls able to move and tilt.
  • The top roll moves in the vertical plane and the side rolls move on the horizontal plane.
  • When rolling, the top roll presses the metal plane between the two side rolls.
  • The advantage of having the variable three roll is the ability to roll many thicknesses and diameters of cylinders.