EXPERT ADVICE
ity base than resurfacing over the old road
surface.
From the start, the emphasis for milling
machines was to place more power to the
cutting drum, which is needed to remove
more material. Thus, the cutter head it-
self and the cutting teeth designs became
critical. The cutting teeth would dull fair-
ly quickly and needed frequent replace-
ment. The replacement process could
cause enough downtime to greatly detract
from the initial efficiency of the milling
process itself. So, manufacturers worked
on designs for quicker replacement, as
well as increased durability of the cutting
teeth. Different sized cutting drums were
offered so that machines could mill at dif-
ferent widths.
Today’s machines and attachments are
more technologically advanced. They are
designed to handle any asphalt aggregates
in use today. Depending on the depth of
the cut, some of the larger machines can
cut close to 15,000 square yards (13,000
m²) a day, at 75 feet per minute.
In addition to faster speed, added pre-
cision to the milling process has become
important. The innovation of controls
and automation has brought greater pre-
cision for controlling slope, depth, and
speed.
There is no question that the techno-
logical advancements made in microelec-
tronics have benefited milling machines
and attachments. Electronics designed to
improve performance, include electronic
sensors and a built-in cross slope. A pair
of sensors can read a variety of references
from 12 to 55 inches directly below the
bottom of the sensor. Each sensor can be
calibrated and adjusted from the ground
level or at the operator’s console.
The position of the rotor in relation to
the grade reference can be constantly dis-
played on the central controller. Changes
to the elevation controls include the ad-
dition of a raise/lower switch that is used
when milling around obstacles. In many
cases, the electronic control module mon-
itors and regulates the performance of
major machine systems, including speed,
steering, rotor drive, and other functions.
If a problem occurs, a warning is issued.
“The way in which milling is performed
is constantly changing and evolving,
thanks to new technologies,” stated Matt
White, North American sales manag-
er-milling & RS for BOMAG Americas,
Inc., Ridgeway, S. C. “More productive,
powerful machines with improved cut-
ting technology, electronics and grade
control systems require much more skill
in the area of electronics than ever before.
This can create new challenges for opera-
tors, service technicians and manufactur-
ers alike.”
Along with the electronic features that
keep milling machines on track are the
advances being made in the cutting end
of the machines. The ability to change
cutting drums quickly to achieve multiple
cutting widths with the same machine is a
benefit to contractors who may only need
one machine to accomplish multiple job
requirements.
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