Usually temperature resistance varies from -30C + 100C (212F), +70C continuous +100C intermittent. These values do not affect the correct running and quality of the ball transfer units.
Units with felt sealing can bear up to +100C, and without sealing temperatures up to +150C/200C are possible. For a high temperature use of this product we usually suggest ball transfer units with AISI 420C stainless steel carter without felt sealing.
The higher the temperature, the lower the load carrying capacity, as explained in the following relation:
FRICTION COEFFICIENT [µ]
(expressed as % of mass conveyed)
High Capacity 0.005%
Medium Duty 0.2%
Light Duty 0.25%
At a speed of 1m/sec, friction will be around 0,005µ. However, this is subject to considerable deviations according to the specific applications of the ball transfer units.
HOW TO DETERMINE THE TYPE, NUMBER AND DISTANCE
Ball size loading capacity and the effective load placed on each ball transfer unit are normally provided by the weight of charge divided by 3. The result gives the highest load which any individual ball transfer unit may support. It is important that the load is supported through the center line of the unit; the carrying capacity is much affected by the downwards and sidewards applications, so a suitable security charge margin is suggested.
In order to determine the distance between the ball transfer units, divide the shortest horizontal distance of the load by 2,50. For example, for a weight measuring across the base 500mm x 1.00mm the recommended distance will be 200mm (500: 2,50). This is the distance among the units that guarantees enough ball transfer units on the shortest side of the load.
The units can usually be placed in three different ways: