About Discs
 
Single Offset


The simplest and original disc design. The inherent flaw of the single offset disc involves the thrust applied to the lead corner (B) while discing. This imparts a turning moment to the disc (C). The hitch can be adjusted side-to-side to counteract this effect, though changing soil conditions in the field can still cause the disc to swing. It is also thought that the disc gang assembly angle can be adjusted to counter this effect. However, the angle adjustment on these discs is actually used to compensate for disc blade wear.

As the disc blades wear, the effective angle of the entire gang changes - becoming less. Increasing the angle adjustment compensates for this wear. This same thrust at the lead corner is also responsible for the premature blade wear normally experienced at this end of the disc gang assembly. This design is also limited in width. As width increases, so does dimension (A) and eventually the unit becomes so long as to be impractical.

At widths over 20', transport becomes an issue. Some manufactures hinge the extreme ends of the front and rear gang bars to simplify transport. However, these measures seldom survive the stresses of heavy discing and require frequent repair.

To overcome these problems, single offset discs should combine as wide a main frame as possible with maximum weight and rigidity. A wide, heavy frame carrying heavy, rigid gangs will track straighter, last longer and require the least maintenance. KELLO-BILT single offset discs surpass all these requirements.

 

Single Offset
Offset Tandem


The KELLO-BILT offset tandem design incorporates width and transportability in one package. The term offset refers to the fact that the front gangs are offset and overlap in the middle to cut out the center balk. Most tandem designs are not offset and rely on either a cultivator shank and shovel or a spring mounted, angled coulter blade to eliminate the center balk.

These systems do not allow for varying working depths and consequently often leave ridges or troughs in the field. The tandem design tracks straighter than an offset because of its symmetrical arrangement. The KELLO-BILT's double wings are designed as wide as possible to spread the structural weight evenly over the width of the disc. It should also be noted that KELLO-BILT hinges the wings to the frame rather than to the gang bars.

Though more expensive to produce, this is an inherently stronger and more durable design. Each section has its own hydraulically controlled transport assembly to allow maximum depth control for a level, smooth finish. Two tapered blades at each rear corner contribute to the smooth finish.

 

Offset Tandem
Doublewide Offset

The KELLO-BILT doublewide offset is a tandem arrangement that consists of one right hand and one left hand unit of equal widths joined at the hitch and between the frames with spreader bars. This style of disc is very flexible for rocky and hilly conditions. It does not fold but it can be split for transport or to be used as two separate units.
Doublewide Offset

Tapered Roller Bearings




Tapered roller bearings are specifically designed for heavy radial and thrust loads typical of heavy discing operations. This style of bearing is designed so that all elements in the rolling surface and the raceway intersect at a common point on the axis - thus true rolling is obtained.

 

Tapered Roller Bearings
Radial Ball Bearings



Whether trunion mounted or mounted in pressed steel flangettes, radial ball bearings are not suitable for use in heavy tillage discs. As their name indicates they are designed primarily to carry radial loads. As the purpose of discing is to move soil in a direction at a right angle to the disc blade, side thrust is applied to the bearings that carry the disc blades.

Unlike tapered roller bearings, which are designed to accommodate thrust, radial ball bearings deform when thrust is applied. The contact areas between the balls and the raceways are reduced and offset as one raceway attempts to move horizontally relative to the other raceway. This can result in spalling of the metal surfaces and premature bearing failure. In extreme cases, such as rock impact, the raceways may break.

As the bearing is not designed primarily for thrust, neither are the seals which consist of 2 or 3 rubber lips locked to the outer race and riding against the outer surface of the rotating inner race. The deformation of the bearing can cause the seals to invert, be pushed out or lose contact with the inner race. Once contaminants enter the bearing, its failure is assured.

 

Radial Ball Bearing
Disc Blades

Disc blades are available in two styles - notched and plain.  Notched blades penetrate the soil more aggressively as weight per inch of circumference is greater between notches rather than being spread out over the longer continuous circumference of a plain blade. 

As the purpose of KELLO-BILT discs is to maximize performance in heavy trash and primary tillage applications, notched blades are standard equipment on our discs.  Plain blades are available but we recommend they only be used on rear gang assemblies.

There is a perception that notched disc blades wear more quickly than plain blades. Naturally, because a notched disc is more aggressive and therefore performing more work, it should be expected to wear-out sooner than a plain blade.

If both notched and plain blades are working at the same depth and carrying the same load, wear can expected to be equal.  However, wear of the notched blades is more noticeable because the corner of the notch becomes rounded and the depth of the notched decreases.  Without such a reference points, wear to a plain blades is not as apparent and must be confirmed with a measuring tape.

All KELLO-BILT discs can be special ordered with cold applied tungsten hard surfaced blades.
Notched BladePlain Blade
 
       



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