Designs and variants
- single direction bearings
- double direction bearings
- cartridge units with a flanged housing
The main criteria used when selecting bearings to support screw drives are axial stiffness and load carrying capacity, running accuracy, speed, and frictional moment. Other factors to consider can be the moment stiffness of a bearing arrangement or the ability to cope with misalignment between the shaft and housing. Mounting and seal requirements also need to be considered. Table 1 provides an overview of the criteria and to what extent the different bearing series fulfil the requirements.