UMPETHA 082009/072010.014
Installing the rack.
Rack to pinion spacing. Correct.
The driving surfaces of each tooth
are 1 to 2mm apart. Allowing for
slight variance in the height of the
rack when the wheels shrink in
colder conditions or where the
gate flexes and the rack is no
longer square to the pinion.
Rack to pinion spacing.
Space to large.
This will cause skipping at the
slightest resistance to the gate
travel, resulting in the motor
control going out of
synchronization to the gate
position. (Losing open limit) The
long term damage here will be
stripped teeth.
Rack to pinion spacing.
To tight.
This will cause unwanted rolling
resistance especially in colder
conditions. Where the wheel
shrinkage will cause the gate to sit
heavier on the pinion or the rack is
no longer square to the pinion due
to gate flex.(False safety sensing
activation)
Begin by fastening the motor atop the base plate with 2mm spacer plates between.
Clamp the end of the first length of rack end to the closing edge of the gate. Rest the other end
of the length on the pinion as shown here. Use a spirit level to ensure the rack remains true.
Rack end clamped to closing edge of gate
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