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Film-Line Roll Alignment

Film-Line Roll Alignment Laser

Film-Line Roll Alignment

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 film line or process mill, all in a fraction of the time needed with conventional methods.

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 wander or "walk" to one side of the roll or the other. This means a lot of down time and tons of scrapped product. Frequently, the only methods available are using optics or 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.

L-742 Significantly Simplifies Roll Parallelism Checks

The L-742 significantly simplifies roll alignment. In fact, the L-742 is so easy to use it usually only requires one technician to operate it. With 2 automatically rotating laser planes, each with 100 feet (30.5 meters) of range in radius, rolls at multiple elevations can easily be checked for horizontal parallelism with one setup.
Read 9 PDA Software - Roll Alignment Tab
The setup process is easy and fast because we use timesaving and simplifying features like is our ALIGN mode in the R-1355.24ZB readout. The feature compares one targets reading versus another, calculating the difference between the two. This allows the user to adjust the roll until the "difference" reading is zero instead of having to calculate the difference in his head. It also is a great time saver for the bucking in process.

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 roll alignmentLaser 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 calibration once a month or so and can easily be checked in the field with a simple 10-minute procedure.

zigbee wirelessWireless Targets and Readout Speeds Setup

The A-1519-2.4ZB/A-1520-2.4ZB targets use the R-1355-2.4ZB Nomad PDA Readout, provide up to 0.00002" (0.0005 mm) resolution, color software and a wireless receiver to display up to 5 targets simultaneously. Other features like electronic zeroing and target averaging help to speed setup.


Tram Bar Measurement Method

For situations where it’s impossible to put the target on the side of the roll, we use the Tram Bar Method.  Here you put a tram bar over the end of the shaft and put a target on it.  Zero at 12:00 and measure at 6:00 to check roll levelness. Then zero at 3:00 and measure 9:00 to get the parallelism relative to the reference roll.

A-1519-2.4ZB Target using Tramming Method to measure the parallelism

Application Note
Data Sheet
How it Works


  • 2 continuously rotating laser planes with operational range of 100' (30.5 meters) in radius.
  • Laser planes flat to 1/2 arc seconds (0.00003"/ft or 0.0025 mm/M) in 180º sweep and 1/4 arc second (0.000015"/ft or 0.001 mm/M) in 90º sweep.
  • Planes are mutually square to 1 arc second (0.00006"/ft or 0.005 mm/M).
  • Includes Pitch/Roll/Yaw base with coarse and fine adjustments.
  • Standard Targets: A-1519-2.4ZB Single-Axis, Wireless Target with 1" (24.5 mm) Measuring Range and 0.0005" (0.0125 mm) Resolution.
  • Backlit levels accurate to 1 arc second (0.00006"/ft or 0.005 mm/M).
  • Instant on with virtually no warm-up.
  • Typical setup time 20 minutes or less.
  • Diode lasers 2 times more stable than HeNe based laser systems.
  • Battery or AC powered.
  • Completely self contained.
© 2012 Hamar Laser. Products Covered Under US & Foreign Patents.