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A vertical shaft impactor includes an impacting assembly that is configurable in a number of different ways, depending on the material to be processed by the impactor. The vertical shaft impactor includes an impacting chamber and an impacting assembly disposed in the chamber. The impacting assembly

A vertical shaft impactor includes an impacting assembly that is configurable in a number of different ways, depending on the material to be processed by the impactor. The vertical shaft impactor includes an impacting chamber and an impacting assembly disposed in the chamber. The impacting assembly includes a number of rotors supported on a shaft, with the locations of the rotors being adjustable along the shaft. The rotors include adjustable structures for working and reducing materials in the vertical shaft impactor.

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1. A vertical shaft impactor to process a plurality of different materials, the vertical shaft impactor comprising: a housing defining an impacting chamber having a plurality of horizontal shelves secured to the periphery of the housing and extending into the impacting chamber; andan impacting assem

1. A vertical shaft impactor to process a plurality of different materials, the vertical shaft impactor comprising: a housing defining an impacting chamber having a plurality of horizontal shelves secured to the periphery of the housing and extending into the impacting chamber; andan impacting assembly disposed in the impacting chamber, the impacting assembly comprising a vertical shaft supported by the housing,a plurality of rotors concentric with the shaft and rotatable relative to the housing,a plurality of key slots defined in the vertical shaft at predefined intervals along the vertical shaft, anda plurality of keys selectively disposable in the key slots, each key including a nub for supporting one of the rotors along the shaft, the keys being interchangeable to vary the vertical position of the plurality of rotors relative to the shaft. 2. The vertical shaft impactor of claim 1, wherein the plurality of rotors comprises a plurality of vertically spaced impacting rotors and an impeller rotor, wherein the impeller rotor is located vertically below the impacting rotors. 3. The vertical shaft impactor of claim 2, wherein each impacting rotor comprises a planar cutting disk and a selectable number of radially-extending cutting assemblies removably mounted to the cutting disk; wherein each cutting assembly comprises a hammer supported by an upwardly facing top surface of the cutting disk, a cutting blade supported by the hammer, and a fan blade adjacent a downwardly facing lower surface of the cutting disk. 4. The vertical shaft impactor of claim 3, wherein the hammer, the cutting blade, and the fan blade each have through-holes that share a common spacing such that when the through-holes are aligned, the hammer, the cutting blade, and the fan blade may be collectively aligned with a corresponding bolt pattern through the cutting disk. 5. The vertical shaft impactor of claim 4, wherein the bolt pattern through the cutting disk comprises three bolts arranged in a straight line defined by a ray extending from the center of the vertical shaft. 6. The vertical shaft impactor of claim 3, wherein the cutting disk comprises a plurality of holes defined therein, and wherein the holes define a plurality of selectable mounting positions for the cutting assemblies. 7. The vertical shaft impactor of claim 3, wherein the selectable number of cutting assemblies is one of 4, 6, and 8, and the cutting assemblies are mounted to the cutting disk with an equal spacing about the disk, the interval between the cutting assemblies decreasing with an increase in the number of cutting assemblies. 8. The vertical shaft impactor of claim 3, wherein the cutting disk is configured to permit cutting assemblies to be added or removed to change the number of cutting assemblies mounted to the cutting disk. 9. The vertical shaft impactor of claim 3, wherein each of the cutting assembly comprises a hammer, a cutting blade supported by the hammer, and a fan blade. 10. The vertical shaft impactor of claim 9, wherein the each hammer is configured as one of a bar, a mallet, a beveled, and a serrated configuration. 11. The vertical shaft impactor of claim 9, wherein the hammer comprises a first cutting edge on a first side of the hammer and a second cutting edge on a second side of the hammer and spaced from the first cutting edge by a width of the hammer. 12. The vertical shaft impactor of claim 2, wherein the impeller rotor comprises a planar fan disk and a plurality of radially-extending fan blades mounted to an upwardly-facing top surface of the fan disk. 13. The vertical shaft impactor of claim 12, wherein the plurality of fan blades of the fan disk comprises a fixed number of fan blades. 14. The vertical shaft impactor of claim 13, wherein the fixed number of fan blades is 4. 15. The vertical shaft impactor of claim 12, wherein each fan blade of the fan disk has a flange mounted to the top surface of the fan disk and a blade portion extending vertically upwardly from the flange to define an angle of about 90 degrees with the flange. 16. The vertical shaft impactor of claim 15, wherein each fan blade has at least one triangular end connecting the flange with the blade portion. 17. The vertical shaft impactor of claim 15, wherein the blade portion has a vertical height configuration selectable from a plurality of vertical height configurations based on a characteristic of a material to be processed by the vertical shaft impactor. 18. The vertical shaft impactor of claim 12, wherein each fan blade is mounted to the fan disk using a bolt pattern comprising four bolts arranged in a straight line defined by a ray extending from the center of the vertical shaft. 19. The vertical shaft impactor of claim 1, wherein the plurality of rotors are spaced from each other by a vertical distance that is variable based on a characteristic of a material to be processed by the vertical shaft impactor. 20. The vertical shaft impactor of claim 1, wherein the plurality of rotors comprises first, second, and third impacting rotors, the first and second impacting rotors are vertically spaced by a first interval, the second and third rotors are vertically spaced by a second interval, and the second interval is not the same as the first interval.