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(1) High capacity per dollar of investment.
(2) Annular discharge opening minimizes slabbing; makes for more cubical product. (3) Shape of receiving openings favorable for slabby material. This, plus point 2, gives the machine a distinct advantage over the jaw for handling thinly stratified stone.
(4) Long receiving openings, plus large area, tend to minimize bridging.
See al so the comments under "Transportation Equipment and Feeding Methods." (5) Double receiving openings permit dumping from two sides of crusher.
(6) Relatively low Flywheel effect minimizes starting peaks; also allows the machine to stop quickly when power is cut off due to over-Ioads caused by tramp iron or choking.
(7) Machine can be serviced by simple overhead crawl-type hoist, whereas jaw crusher requires crane with travel in two directions to properly handle parts.
(8) Relatively high pinion shaft speeds permit use of higher speed motors, and lower-ratio drives.
(9) Lubrication is simpler and more economical than is possible to achieve in the jaw crusher.
(10) Cost of foundation will usually be lower than for the jaw crusher.
( 11) Necessary safety guards are less extensive than for the jaw crusher.
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