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Unless the rock is exceptionally friable the maximum thickness of the feed should not exceed that thickness which the crusher can effectively nip between the advancing slugger teeth and upper part of the anvil; the only breaking done on top of the roll should be the beam-action breaking of long slabs. For that reason the maximum advisable thickness of ledge is established by the distance between the face of the anvil, and the point of contact on the face of the roll where the teeth can get a fun "bite" on the rock. This of course is a function of the roll diameter, which governs the general proportions of ,the crushing chamber.
The 24-in. diameter Fairmount crusher has an effective nip of about 14 in. maximum; the machine will grip stone up to.' about 24 in maximum; and the 60-in. crusher will handle ledges up to about 36 It. thickness. These thicknesses are based on limestone of medium hardness; for harder material s the advisable thickness is somewhat less.
So far as width is concerned, the crusher will handle any piece that will enter into the crushing chamber between the si de liners. There is no practical limitation to the length of the feed, so far as the crusher itself is concerned. If the piece is not too thick the machine will break any rock that can be maneuvered end-on into the crushing chamber.
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