Quantity: The number of ball transfer units required depends on the load weight, dimensions, and the condition of the load-bearing surface. When calculating the necessary quantity, one must consider the maximum load weight and the smallest load-bearing surface area, and assume that only a portion of the ball transfer units are supporting the load; this allows for the calculation of the required load capacity per individual unit.
Spacing: To ensure that the load-bearing surface remains continuously supported by the ball transfer units-thereby preventing slippage-the spacing between the units should be set to the length of the shortest edge of the load-bearing surface divided by 2.5.
Temperature Resistance: Ball transfer units constructed from different materials exhibit varying degrees of temperature resistance. For instance, units featuring steel balls and felt seals can withstand temperatures of up to 1000°C, whereas those utilizing plastic balls and specialized seals are rated for temperatures up to 60°C. As the ambient temperature increases, the maximum permissible load capacity decreases proportionally; therefore, when selecting a unit for a specific application, it is essential to choose a model appropriate for the prevailing operating environment temperature.