Technical data GN 509.3 for ball transfer units GN 509 and GN 509.1

Ball transfer units consist of a metal body inside which a ball, supported by smaller balls, helps in conveying loads applied on a plane surface in every direction (for example conveyor belts).

Choice of the ball transfer unit

To choose the proper ball transfer unit for a conveyer track, both weight and dimension of the load to be carried must be taken into consideration.
The max distance “a2” between the ball transfer units (on a plane surface) is obtained by dividing the smaller load dimension to be conveyed (a1) by 2.5.
This calculation (based on an elementary geometry principle) guarantees that a load is always supported by at least 3 ball transfer units, thus preventing it from tipping over.
As far as the weight is concerned, as the load is supported by at least three different ball transfer units, each of them would bear a third of the total weight (the total weight divided by three).
It may be equal or lower than the max load capacity values showed in the table for every unit.