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The actual minimum safe setting will vary somewhat, for any given machine, depending upon the character of the material, the amount of fines in the feed, and whether the crusher is being operated under choke-feed or regulated feed conditions. It is possible, when all conditions are favorable, to operate gyratory crushers, with standard throw eccentrics, at smaller discharge settings than are indicated by the published tables. Generally speaking, however, it cannot be considered good practice to do so; and any experimentation along these lines should be accompanied by a close check on the power consumption, to make sure that the crusher is not being overloaded.
When it is necessary, or desirable, to operate a gyratory crusher at discharge settings below the minimum standard, the safe procedure is to fit the machine with a reduced throw eccentric. The crusher manufacturer will be able to advise the operator about these special throws for machines of his make.
If a reduced throw eccentric is installed, the capacity at any given setting will drop off approximately in direct proportion to the reduction in throw. In some cases it is possible to compensate, partially at least, for this drop-off by speeding up the machine. Here, again, the manufacturer will be able to advise the operator as to the maximum safe speed for any particular crusher of his line.
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