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Much of the foregoing discussion of secondary crushing stages will apply equally well to any succeeding stage, especially so if the stage is to run in open circuit. The cardinal factors of capacity, feed size and product size must be checked in very much the same fashion, keeping in mind the probable difference in types of crushers to be used. Usually, when we arrive at the third stage in a crushing plant, we are dealing with reduction or fine-reduction crushers where the feed size, as established by the open side setting of the preceding stage, must be checked against the maximum one-way dimension of rock that the reduction crusher will nip. This comparison is usually all that is required to assure an adequate receiving opening, but it should be kept in mind that this maximum nip-dimension is not the full radial receiving opening of the reduction-type crusher.
In our own lines of reduction and fine-reduction crushers this differential in full, and effective, receiving opening applies to the Superior McCully reduction crusher, the New house crusher (with full-curve, non-choking concaves), and the Hydro con e crusher. To assist in the selection of machines of these types the following table has been prepared to show the maximum one-way dimension of rock that each machine will nip. These dimensions are for minimum crusher settings. In the case of the Superior McCully and New house crushers they will increase by whatever' amount the proposed setting exceeds the minimum, full both of these machines the figures apply to full-curve, non-choking concaves.
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