Relationship Between Feed Size and Roll Diameter of Crusher

The diagram in Fig. 3 shows the method used in calculating maximum feed size for any diameter of rolls; the accompanying table gives a listing of feed sizes for standard diameters. These figures are based upon zero roll spacing; therefore the distance between faces (i.e., the discharge spacing to be used) should be added to them to obtain the

maximum feed size for any combination of roll diameter and setting. The calculations are predicated on a coefficient of friction of 0.3, which is safe for most materials, provided that the surface speed of the rolls is not too high.

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