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Application Design




TYPICAL MOUNTING CONFIGURATIONS


How to determine the type, number and mounting arrangement of ball transfer units.

LOAD CAPACITY

Equal load distribution over many ball transfers is seldom, if ever achieved. Load distribution is governed by the flatness, hardness and smoothness of the load surface in contact with the balls and the ball transfer installation height variance and system deflection. Absolute flatness of the application is difficult to insure under field service conditions. To avoid exceeding the rated capacity of any individual ball transfer units, sufficient ball transfers should be provided to afford a safety factor of 3. As an example: The number of ball transfers (75 lb maximum capacity) to support a load of 750 lbs would be 10 units x 3 or 30 units to obtain smooth rolling motion under varying degrees of flatness and ball contact.

The force required to put a load in motion is also governed by the flatness, hardness and smoothness of the surface in contact with the balls. Engineering calculations will usually determine that the force required ranges between 1 and 5% of the load weight. As the number of ball transfers under a load is increased, the force required to put a load in motion will be decreased.

When calculating loads, the possibility of impact and unequal leveling should be considered. Self-leveling rubber cushions placed under each unit can reduce these problems. The rubber cushions allow the units to equalize, thus reducing the possibility of excessive loading on some of the units. The rubber cushions also protect the units against impact loading. High-density rubber cushions are available for several models of ball transfers in this catalog.

ARRANGEMENT

Arrangement of the ball transfer units depends on the weight of the load, surface of the application and undersurface of the conveyed load. Determine the number of ball transfers required to support the load based on the considerations above. Once the number of units has been calculated, these units should be arranged symmetrically under the load. The minimum distance between the ball transfers should be the length of the shortest dimension of the load divided by 2.5. This minimum spacing will support the conveyed article and prevent it from becoming unstable on the conveyor.

Application engineers should be conscious of load sharing considerations in the design of the application. Our technical staff is available to assist you with mounting and spacing recommendations for your applications.

MAINTENANCE

All carbon steel ball transfers are prelubricated and sealed, thus not requiring further maintenance. Most units have a drain hole in the bottom of the unit to expel dirt and moisture. In certain extreme applications, units may be maintained with a cleaner or lubricating fluid applied to the main ball at regular intervals.

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