Ball transfer unit types |
Ball transfer units with solid steel housings |
Ball transfer units with solid steel electro zinc-plated housings are specially designed for heavy-duty tasks and remain functional even under heavy impact loads and extreme conditions. The norelem ball transfer units with solid steel housing can be used for heavy loads of up to 15,000 N. |
Mini ball transfer units mini |
norelem offers a further variant in the form of mini ball transfer units. This special design is mainly used in measuring instruments, for conveying materials in clean room areas and in miniature mechanisms. The ball transfer units consist of a housing with integrated bearing shell, a cover, a load ball and several bearing balls. The mini ball transfer units are available in the norelem online shop in a steel and stainless steel version. |
Ball transfer units with sheet steel housing |
norelem ball transfer units with sheet steel housings are equipped with felt seals. These felt seals ensure that the penetration of dirt is reduced. Depending on the requirements, you can choose between electro zinc-plated steel and stainless steel. |
Load ball |
Customers have additional options when choosing the load ball type. In addition to steel and stainless steel, they can also opt for a polyamide load ball. Ball transfer units with polyamide load balls (plastic balls) are particularly suitable for the transport of sensitive goods such as glass or polished aluminium and sheet steel. |
Heavy duty ball transfer units for outdoor use |
All steel ball transfer units are designed for a long service life under shock loads. All units are supplied with solid steel housings and hardened surfaces. Due to the numerous drain openings, the ball transfer units have a very high degree of self-cleaning. They are therefore particularly suitable for use in outdoor installations. |
Ball transfer units with threaded pin |
These ball transfer units have a large support area. Due to the screw fastening they have a high stability and a high load capacity. The moulded wiper seal for the load ball is external. |
Ball transfer units with fastening element / fastening hole |
Ball transfer units with fastening elements or fastening holes (without housing) can be easily mounted and dismounted from the functional side. The ball transfer units with fastening element are fixed with spring-loaded claws. These permit large tolerances in the mounting hole. |
Ball transfer units with spring element |
Ball transfer units with spring elements enable an even load distribution when transporting goods with an uneven surface. When used in machines such as guillotines, press brakes, etc., the element springs out again at the end of the machining process and the workpiece can rolled off. |
Tolerance rings |
By using a tolerance ring a larger tolerance range between the parts to be joined is possible. The ball transfer units can be installed quickly and cost-effectively. |
Installation instructions and technical data |
The installation instructions and technical data can also be found in the data sheet for our standard ball transfer units (95000). |
Determining the ball transfer unit loading |
To determine the load for a ball transfer unit, the weight of the transported goods is divided by 3. If the load ball level is well coordinated, the number of load-bearing ball transfer units can also be calculated, depending on the nature of the transported goods. |
Arrangement of the ball transfer units |
The arrangement of the ball transfer units depends on the surface area of the goods to be transported. By goods with a uniform, level surface area, such as the base of boxes, the distance between the ball transfer units is simply calculated from the length of the shortest edge divided by 2.5. |
Transport speed and load rating |
The recommended conveyance speed is 1 m/sec. With polyamid load balls 0.25 m/sec. The specified load rating applies to all mounting positions and relates to 106 revolutions of the load ball. By extended use in excess of 1 m/sec and depending on the loading, the temperature can be expected to rise and the useful life reduced, particularly with balls Ø60 to Ø90. |
Calculating the service life: |
L =(C/F)³ x 10⁶ rotations
L = service life
C = load rating (N)
F = load (N)
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Attention: Use a high-temperature lubricant!(see Ball transfer unit data sheet )(95000). |
Temperature resistance |
The temperature resistance of ball transfer units with felt seal is 100 °C permanent temperature. At temperatures above 100 °C only non electro zinc-plated ball transfer units with steel load ball without felt seal can be used. Note reduction in load capacity! Multiply the load rating by the temperature factor (table). |
Determining the loading for ball transfer units with spring element |
For these types the determining factor is the value given in the “Pre-tension” column of the table. The weight of the transported goods is divided by the number of supporting ball transfer units. |