The Bearing Carriage has four polished tracks on which the bearings are in linear rolling-ball contact with the profiled rail. The bearings are recirculated through the end-face reverse units and closed return conduits. The carriages are fitted with end-face wipers and additional longitudinal wipers in order to minimise sensitivity to external influences.
The minimum stroke length (hmin.) is required if the rolling-ball contact is to be adequately lubricated. The carriage is charged at the factory with lithium-based grease. Lithium-based grease with a mineral-oil base can be used for re-lubrication.