Another important factor is the Automax design of the 1300 Maxtrak cone. A closed-side setting allows for easy adjustment while the machine is running. “Fines can cake up and damage other makes of cone crushers,” Kobyluck says, “but not the Automax. Further, the 1300′s cubicity is superior. The crushed product is smoother and has a better finish without a lot of jagged edges; so it’s much more ‘workable’ for making concrete. Before we got the 1300 Maxtrak, we were using a smaller stationary cone by another manufacturer that just wasn’t getting the job done.”

Specific materials produced at the Rattlesnake Quarry include #6 (0.75 inch, 0.375 inch, and 0.5 inch); #7 (0.5 inch); #67 (a 1-inch blend of  #6 and #7); #4 (1.5 inch); and #3 (6 inch coming straight out of the jaw crusher). The 6-inch product is conveyed first to the primary screen to scalp a 1-inch minus base material. The 1-inch plus overs are then sent to the cone to make 1-inch minus material that goes to the 20- by 6-foot triple-shaft, three-deck horizontal screen with the re-circulating feature.

Kobyluck has been operating the 26- by 44-inch jaw crusher since 2005; the dry screen since 2006; the cone crusher and scalping/screening plant since April 2008. Replacing the old 26- by 44-inch jaw and old, smaller cone in April 2008 has completed the current system that has doubled previous production and improved product quality.

The jaw crusher features an “M” series single-toggle jaw with a hydraulic adjust system for changing the machine quickly with no drawback rod adjustment.

The cone features the all-in-feed Automax design for better throughput, shape, and reduction for secondary, tertiary, and quaternary use. The design can effectively utilize greater engine power and has lower frictional loss. This results in greater production, product quality, and fuel efficiency. More of the energy is used to crush the rock, rather than to overcome the frictional resistance that may occur in other cone crushers.

The primary screen is a high-capacity, heavy-duty machine capable of dry screening, three-way splitting, and stockpiling a wide variety of materials in the most demanding applications.

The dry screening plant with a re-circulating feature is designed for large-volume processing up to 800 tons per hour with screen motion variances that allow the operator to adapt the plant to specific applications, providing high resistance to pegging and blinding, and with high energy characteristics to loosen fines.

Keys to a successful quarry

Kobyluck is a family owned and operated company started in 1972 by Josh’s parents, Dan and Maureen Kobyluck, with one truck. The company now consists of four divisions: Quarry, Trucking, Construction; and Ready-Mix Concrete. The divisions are run by the four Kobyluck brothers, who have all been involved in the company one way or another since an early age – Josh since he was 12 years old. The quarry operation provides crushed stone for use in the construction and ready-mix divisions, and for sale to a variety of customers.