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“Preset” is a
method
to reduce the size of upper plates of sliding bearings in order to save
the material
cost.
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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.
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