Models S12-56, S8-43 & S8-43S

In addition to building the best tub grinders possible, W.H.O. also offers their customers superior service. You can call the factory and talk directly to the people who built your grinder. They'll know what machine it is and any of its special features. If you need parts they can just about always be shipped the same day you call.
 

Avoiding costly downtime is critical to your bottom line. When you purchase a

Look at the many quality features the W.H.O. grinders have. You'll appreciate the benefits you will receive as an owner, such as: minimum downtime, maximum capacity, low maintenance, multiple product use, dependable service, and increased profits. The standard Stationary Grinder, Model S12-56, manufactured by W.H.O., is of the same high quality construction and materials used in the P12-56 Portable Grinder. Power units are specified by the customer. The frame is 12" channel iron and the supports are made of 1/4" plate steel. The discharge area under the cylinder is built to the specifications of the customer.

Built for large capacities, the standard heavy-duty cylinder shaft is 56" long and 4 7/8" in diameter, with a 3 3/16" diameter bearing journal. There are eight rods in the cylinder which go through the cylinder plates and one end of each hammer. Twelve hammers, 3/8" thick, are spaced between every other cylinder plate for a total of 96 hammers. The weight of the hammers, when in motion with the cylinder, act as a flywheel giving the cylinder a more uniform balance and even motion.

Two cylinders can be used in the same tub if additional capacity is desired or extra fine grinding is anticipated. The cylinder is factory balanced for vibration-free operation. Balancing can be performed in the field following the directions given in the owner's manual.

The 12-foot, 2 1/2" flared tub top reduces spillage. The inside diameter of the tub is 10'. The straight sides improve feeding of material. Side fins inside the tub move material away from the edge of the tub to the cylinder as the tub rotates.

The grinding screens are made in two sections. Different sizes can be used with grinder to achieve a mixed grind, if desired

The frame is 7/8" bar stock. Screens have an area of 2,800 square inches on Model S12-56, and an area of 2,275 sq. in.on Model S8-43. Standard hole sizes run from 1/16" through 6". Optional sizes available upon request. Screens are interchangeable.

On each end of the main shaft are heavy-duty SKF ball bearings. The cylinder power source can be specified by the customer and mounted at the factory or in the field.

INSTALLATION:
For the most efficient method of operation, the tub should be set with the top edge about four feet above the floor or the bottom of the tub at floor level. This allows the drive train, power source, support rollers, and chain to be easily accessible for service and maintenance. This also makes it easier and safer for cleaning up under and around the grinder, and is a more convenient height for loading the tub.

Pictured is a typical installation of two tub grinders in an alfalfa mill. Mounted in this position, the operator has easy access to the power source, bearings, drive shaft and other areas which should be monitored. The owner of this installation said he had previously owned grinders mounted at floor level, but this installation with the tub above the floor is the safest and also the easiest for servicing the grinder. It's also the quickest for general cleanup. He said he wouldn't have them installed any other way.

W.H.O. Stationary Grinders have the reputation of being the best investment in grinders because they have the kind of "staying power" that's hard to find. This is the original tub grinder built by W.H.O. Mfg. in 1945. It has been in operation daily in a variety of installations.

Since receiving the original tub grinder patent in 1952, W.H.O. has made many design changes to benefit the user, but it's still the same machine. Each grinder is built to order and a variety of options are available to customers.

The tub is driven by electrical power through a planetary gear box with variable speed control, using a load sensor on the electric line to the motor.  The sensor will slow down the tub according to the load, toughness or moisture content of feed stock

The cylinder on the Model S12-56 can be driven by an electric motor or engine.  Screens are accessible from the tub, and the cylinder ca be removed through the tub.  The tub is driven by the sprocket and differential from an electric motor with a load sensor to govern tub speed.

The tub rests on heavy-duty roller bearings, adjustable roller guides make it easy to center the tub and the extra strong chain keeps it turning in the toughest conditions.

The tub is tilted hydraulically for changing screens, or for servicing.  The safety brace is provided with pins to be locked on the hydraulic cylinder shaft for safety purposes when the tub is raised.  Not the heavy-duty bracing on the underside of the tub.

The tub rests on heavy-duty roller bearings, adjustable roller guides make it easy to center the tub and the extra strong chain keeps it turning in the toughest conditions.

The cylinder on the Model S8-43S is driven by an electric motor.  The power is transferred by jackshafts and 10 V-belts (for use on 50 Hz. electric power).  The belts reduce vibration and load shock from the cylinder to the motor.  The Model S8-43 (for use on 60Hz. electric power) is driven directly from the motor.

Side fins inside the tub help move material away from the edge of the tub and into the path of the cylinder.