The L-742 Ultra-Precision Dual Scan® Laser offers 2 automatically
rotating laser planes. It has been designed specifically for roll alignment
applications. It is a very affordable yet powerful tool to not only MEASURE
but also FIX roll misalignment on almost any kind of process mill, all
in a fraction of the time needed with conventional methods.
A blown-film line requires 2 different alignments. The first is to align
the vertical die centerline to a set of nip rolls, frequently 3 stories
or so higher than the die. Traditional methods of using a plumb bob are
difficult to set up and are not very accurate. Misalignment results in
poor product quality and lots of downtime trying to fix it.
The second alignment is the parallelism of the nip rolls to the take-up
rolls. This is an extremely difficult task as the nip rolls are frequently
3 stories higher than the take-up rolls. If the rolls are not aligned
properly, the product will start to wrinkle and "walk" to one
side of the rolls, seriously impacting product quality.
L-700
Ideal Solution to Die-to-Nip-Roll Alignment
The L-700 Laser Alignment System is an ideal system to align the nip rolls
to the die. Using the rear-mounted .500" mounting stud and our NORMIN
method, the L-700 can easily be fixtured into the center of the die, projecting
the center up to 100 feet (30.5 meters). To see if the nip roll is centered
over the die, a simple fixture is used to hold a 2-axis target. Each end
of the roll is then measured to determine how centered it is to the die.
The system has an accuracy of +/-.001" (.03 mm) in 100 feet.
L-742 Significantly Eases Roll Parallelism Checks
The L-742 significantly simplifies nip-to-take-up roll alignment. With
2 automatically rotating laser planes, each with 100 feet (30.5 meters)
of range in radius, roll alignment to +/- .002" (.06 mm) in 100 feet
becomes not only feasible, but easily attainable. In fact, the L-742 is
so easy to use it usually only requires one technician to operate it.
More Accurate Alignment Increases Material Flow and Quality
With poor alignment, most roll-type machines, whether a film line or paper
machine, will produce a product that has wrinkles and other quality problems.
The material will also want to wander or "walk" to one side
of the roll or the other. This means a lot of downtime and tons scrapped
products. Frequently, the only methods available are optics or using trial
and error with tram bars, both of which are very time-consuming and costly.
The L-742 Roll Alignment System, by contrast, is so accurate and easy
to use that you can get the alignment right the first time, saving enormous
costs in reduced downtime, scrapped product and quality problems. In fact,
most machines that can handle it can run at faster speeds after laser
alignment. This increased productivity will pay for the laser in a matter
months, in some cases.
High
Accuracy Reduces Optics' Guesswork
Hamar Laser's L-742 Roll Alignment System is accurate to +/-.002"
(.06 mm) in 200 feet (61 meters) under good atmospheric conditions. This
accuracy turns the alignment process from an art using optics to a science
using lasers. Optics are considered an art because each operator "sees"
the readings differently and essentially has to make an educated guess
as to the correct number. In fact, it is rare that any 2 optics operators
will get the same numbers. With the L-742, this guesswork is essentially
eliminated because the target electronics determine the alignment reading.
And it is very repeatable from one operator to the next!
Factory-Built Benchmark Fixturing
The L-742 Roll Alignment System comes with fixtures to pick up floor benchmarks
for aligning the laser to the machine's centerline. The L-742 also has
the flexibility to easily use the reference roll to set up temporary offset
centerlines. In fact, this is our preferred method of referencing the
machine's centerline, as benchmarks are frequently in not much better
shape than the floor they sit in. Cracks in the floor can seriously affect
the position of the benchmarks and often result in poor alignments.
Laser Planes Have 200-Foot Range Vertically and Horizontally
One of the most powerful features of the L-742 is the automatically rotating
laser plane with 100-foot (30.5 meters) range in radius. That means rolls,
at almost any elevation, can be measured simultaneously without having
to move the laser vertically. This also allows the laser to be moved to
more sections without having to change the location of the reference targets.
Competitive Systems Use 10-Year Old Technology
Our competitors' roll alignment systems use point-and-shoot laser technology,
along with remote beam-bending devices that are difficult to set up and
relocate. We abandoned that laser technology 10 years ago with the introduction
of our multi-plane, continuously rotating lasers. Not only is this point-and-shoot
technology difficult to set up, it also requires extra manpower and about
50% more time.
Less Manpower Needed for Alignments
The L-742 Roll Alignment System reduces the alignment-team manpower. Wireless
targets and automatically rotating laser planes make setting up the laser
at each machine section easier. Our laser systems usually require only
one operator. The wireless readout displays both targets simultaneously,
allowing the user to quickly reference the benchmarks. Traditional optics
usually require at least one man holding a reference target in both reference
locations.
No Need for Optic's Time-Consuming Recalibration after Plumb Measurements
Unlike optics that usually require recalibration of the levels each time
plumb is checked, the L-742 can simultaneously check level and plumb from
a single setup. The levels usually only require one calibration at the
start of the job, and if the laser is not taken off the base, level calibration
is only required once a month.
Wireless
Targets and Readout Speeds Setup
With Hamar's new line of wireless targets (A-1519, A-1519HR & A-1520
or A-1531, A-1532 & A-1533) there is no need to string long extension
cords to reference targets. The targets have up to a 3" (76 mm) measuring
range and can be used up to 100 feet (30.5 meters) from the laser.
The 1532/1533 targets have built-in readouts and .001" (0.013 mm) resolution. The A-1519-900, A-1519-2.4, A-1520-900 and A-1520-2.4), have up to a 1" measuring range, a resolution as low as 0.00001" (0.00025 mm) and can be used up to 100 feet (30.5 meters) from the readout. The R-1310-900 (R-1310-2.4) Readout uses a HP PDA, color software and a wireless receiver to display up to four targets simultaneously. Other features like electronic zeroing and target averaging help to speed setup.
L-700
Ideal Solution to Die-to-Nip-Roll Alignment 
Wireless
Targets and Readout Speeds Setup