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To show the characteristics of this type of crusher when fitted with non choking con caves we have prepared a diagram of the same size machine so equipped (Fig. 6). We now have the cumulative benefits of the flared head and curved-profile liners. There is a marked reduction in the number of strokes required to shift plane "O" down to the discharge level; the chokepoint has been raised, and the ratio of volume reduction is lower (about 1.2:1).
There is a decrease in the effective receiving opening, as compared with the straight-face chamber, when using "full-curve," non-choking con caves, which is the type shown in our diagram. This effective opening is established by the maximum angle of nip; therefore it varies somewhat for different materials, and in different sizes of crusher. For this crusher 26 deg. was chosen as the governing angle; about 28 deg. is the conservative maximum for the largest machines of this type.
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