“Preset” is a method to reduce the size of upper plates of sliding bearings in order to save
the material cost. The normal length of a upper bearing plate should be composed of the
following components: length of bearing + 2 x irreversible movement + 2 x reversible
movement. Initially the bearing is placed at the mid-point of the upper bearing plate
without considering the directional effect of irreversible movement. However, as
irreversible movement normally takes place at one direction only, the bearing is
displaced/presetted a distance of (irreversible movement/2) from the mid-point of bearing
in which the length of upper plate length is equal to the length of bearing + irreversible
movement + 2 x reversible movement. In this arrangement, the size of upper plate is
minimized in which irreversible movement takes place in one direction only and there is no
need to include the component of two irreversible movements in the upper plate.
Note: “Preset” refers to the displacement of a certain distance of sliding bearings with respect to upper
bearing plates during installation of bearings.
