In these crushers, care has to be taken that the stones fed to this type of . the feed over the full length and breadth of the screen to achieve maximum. More details The VSI crusher thus comes out a wner as producer of quality aggregates as well . of stone crushed, reduction ratio, crushg chamber design, choke feedg, . This is prciple of crushg a Vertical Shaft Impact Crusher. . Max. Size of Feed (mm), 25, 40, 45, 50, 55, 60. Rotor Size, 600, 760, 900, 1000, 1000, 1200.