Material Handling for the Marble and
Gentle handling and accurate positioning
are extremely important when you work
with expensive and highly brittle
raw materials. At times, the use of
air handling systems makes positioning
slabs easier, and sophisticated below-the-hook
devices (such as vacuums) aid in the
process as well. But cost-effective
material handling begins with a quality
lifting system, and North American
cranes are ideal for your precise
Our mechanical braking system on
the trolley and bridge eliminates
the need to adjust brakes on a regular
basis (typically every 3 months).
There are no brake pads to change
or adjust with our mechanical brakes.
This will reduce overall maintenance
and extend the life of the wheel gears
We use a minimum
of 2 bearings per wheel.
All of our bearings are Class "D" which means they are designed with a
minimum life expectancy of 10,000 hours of actual motor on-time.
This is double the Class "C" rating - bearings for Class “C” cranes have a minimum life expectancy of 5,000 hours.
Our Class "D" bearings are also sealed-for-life
and never need lubricating.
Our contactors, rated for 20,000,000
stop / start cycles if used in conjunction
with electronic soft start features,
should never need replacing under
normal operating conditions. Click
here for our Technical Report on electrical
For maximum control, we also offer
infinitely variable speed controls,
which allow the movement of the hoist,
trolley and / or end trucks to be
precisely regulated by the operator
from 1% to 100% of the main speed,
and any speed in between. With this
option, the load is lifted or moved
at precisely the desired speed--very
slow for precise positioning, moderate
speed for cluttered areas, or full
speed for efficiency.
In addition to
variable speed invertors
offer other significant advantages:
- Dramatically reduce wear
on brakes (15-fold),
by eliminating quick, repetitive
- Reduce wear / Extend
gear motors and couplings; and
- Eliminate contactors.
Finally, North American's concrete
and stone dust package keeps the electrical
controls and motors of your crane safe
from the effects of airborne particles
through the use of totally enclosed motors
and gasketed control boxes.
design capabilities go far
beyond this simple list, however.
Our team of engineers can custom-design
for the most demanding and complex
applications; no matter what
your requirements, NAI
expertise can improve your productivity
and add value to your operation.