crossed or “skewed” with respect to the
other. Put the crossing point at the middle
of the two rolls, pick the right
amount of crossing and, when they deflect,
the gap between them presents itself
as uniform across the roll face.
The roll crossing mechanism is comprised
of a motor-driven screw turning
in a fixed nut, applying a force against
one side of a main bearing housing, with
that force opposed by a hydraulic cylinder
acting against the other side of the
bearing box, thereby “capturing” the box
between screw and cylinder. The mechanism
is applied to both main bearing
boxes of the roll to be crossed, with the
drive trains arranged to move the boxes
in opposite directions.
Normally, there is a means of coupling
the two drive trains to ensure that
the bearing boxes are moved the same
distance in opposite directions, to keep
the crossing point at the center of the
roll face