L-708/L-708LD Bore Lasers

L-708 Standard and L-708LD Long Distance Bore Lasers Designed specifically for those applications where it is hard to mount a bore laser externally, such as stern tube bearings, the L-708 offers the ability to be inserted directly into a bore for very fast, high-accuracy bore alignments. With high resolution, the capability to measure a wide range of bore diameters, and our patented A-514 self-centering bore adapters, the L-708 is the best choice for hard-to-fixture bore alignment applications.

The L-708 also offers a variety of target options, including self-centering, see-through, 2-axis and 4-axis targets, hand-held readouts, and Windows®-based software to display and analyze alignment data. The system handles a wide variety of bore alignment applications, including: bore straightness checks for cylinders and large gun barrels, engine-block crankshaft bore alignment, and stern tube bearing bore alignment. If your specific application isn’t listed, call us and we will work with you to solve your unique alignment problems.

The L-708 Bore Laser System

The L-708 Bore Laser is a battery-operated, visible light laser that mounts magnetically in a bore fixture or mounting. It has been designed to be inserted into our A-514 Self-Centering Bore Adapters so it can be inserted into a reference bore, saving setup time. The laser has a mounting surface of 1.2498" (31.745 mm) and the laser beam is centered to this OD to within .0003" (0.08 mm). The L-708 Laser is equipped with coarse and fine angular adjustments necessary to set the laser beam to the center of the far reference target. It is used for applications up to 110 feet (33 M). The L-708LD Long-Distance Bore Laser can be used out to 200 feet (60 M).

Fast Setup and Even Faster Measurements

With simplified fixturing and self-centering targets, the L-708 system can be set up in as little as 15 minutes. Since it literally takes less than a minute to insert the target/adapter into a bore to take a measurement, in most cases bore straightness data can be taken and analyzed in 30 minutes or less. This means that even the longest bore application can be measured in just minutes versus hours for optics, tight wire or other laser systems. Nothing is faster than the L-708 Bore Alignment System!

System Handles Large Range of Bores

Any bore, from 3.75" (92.25 mm) up to 40" (1,016 mm) or more, can easily be measured with our L-708 Bore Laser System. The system offers three bore adapters and a leg-setting gage to set the adapters to the nominal bore ID. For bores from 2.0" (50.8 mm) to 3.75" (92.3 mm), we offer our A-510 Target and A-510STA Self-Centering Adapter Hub and M-705CL Customized Measuring Legs. We even offer bore targets that can measure bore alignment down to .70" (18 mm).

High Resolution and Accuracy

When used with our R-1307 Readouts, the L-708 system provides a resolution of .00002" (0.0005 mm). The system is accurate to .0012" (0.03 mm) and repeatable to .0002" (0.005 mm). Under good environmental conditions, the L-708 Laser is accurate to .004" (0.1 mm) over the whole 100 foot (30 m) range. By mounting the laser externally with L-111 Laser Stand and carefully following the NORMIN procedure, accuracies of .0003" (0.0075 mm) in 10 feet (3.1 meters) can be achieved.

Patented Self-Centering Target & Adapters – The Key to the System

The A-512 2-Axis Bore Target and the L-708 Bore Laser are designed specifically for our A-514 line of self-centering bore adapters. This unique feature allows the laser and target to be inserted into reference bores without any mechanical setup, such as bore sweeping or the need to rotate the target to determine mounting errors (a common problem with most other systems). All you need to do is insert the laser, target and their A-514 bore adapters into the reference bores and make sure they are oriented at 12:00. In just a couple minutes, the laser will be set up and ready to take measurements. Then it takes just seconds to measure each internal bore for alignment. The laser and target are concentric to their housings to within .0003" (0.0075 mm). When used with the A-514 adapters, the target and laser are centered to the bore within .0006" (0.015mm) accuracy.

Another unique feature of our A-514 adapters is they can handle a fairly large range of bore diameter changes of up to .020” or 0.5 mm. This means you don’t need to worry about bore diameter changes to get accurate measurements.

Live Alignment Data Saves Even More Time

Live Alignment Data Saves Even More Time Live Alignment Data Saves Even More TimeAs with all of our laser alignment system, the A-512 Bore Target provides live alignment data via our R-1307 readouts. This means once the target is installed in a bore and you are ready to align it, you just watch the readout continuously update as you adjust the bore, supporting pillow blocks or bearing sleeves. When the readings are zero, you’re done!

Simple Readouts

The L-708 Bore Alignment System comes with simple H & V axis readouts that are extremely easy to use. The R-1307 has a display resolution of .0001 inches (0.001 mm) There is no complicated software to learn in order to use the system, which minimizes training requirements. For those who want to document the alignment and produce a report, there is no easier bore alignment program to use than our Bore9 software.

Powerful new bore alignment software for most bore applications

Hamar Laser's new Bore9 software supports all of Hamar's past and present bore alignment equipment to create a powerful tool for measuring and aligning multiple bores. This comprehensive and easy-to-use program measures bore straightness (axis centering) and diameter change when using our targets in measuring mode.

Measure Bore Angle in Seconds

To check for bore angle relative to the centerline, just take a measurement at the front or back of the bore and any difference shows the angle! Adjust the front and back of the bore to read zero and it’s aligned! Also with our unique design, our target only needs a few inches of bore width to take a measurement.

Long Range and High-Resolution Angular Adjustments

The L-708 can be used for applications up to 110 feet (33 M). The L-708LD can be used for applications up to 200 feet (60 M). The fine-adjustment micrometers can steer the laser beam in the horizontal and vertical axes to .0014" (0.036 mm) in 200 feet (60 M). It can either be mounted in our A-514 Self-Centering Adapters or used with our L-111 Laser Stand and L-102 Laser Beam Translator to be mounted outside of the bore. The L-111 and L-102 have course angular and fine centering adjustments to align the beam to reference bores.

Wireless Data Downloading and Transfer

For long-distance applications, the R-1307 Readout can be configured with a 2.4GHz Zigbee® radio and transmit its data up to 150 feet (45 M). The data can be received by a second R-1307, which is very useful when bucking-in (setting up) the laser to reference targets that are at distances greater than 15 feet, or it can also be received by the A-910-2.4ZB Computer Interface for automatic downloading into our Bore9 Software.

Application note
How it Works
L-708 Bore Lasers - How its works
Alignment System Features
  • Built-in coarse and fine horizontal and vertical angular adjustments for quick referencing
  • Designed to fit into reference bores using our A-514 Self-Centering Bore Adapters to save time and simplify the setup.
  • L-708 has a range of 100' (30 M). L-708LD has a range of 200' (60 M).
  • Visible laser beam straight to .0001" in 10' (0.0025 mm in 3 meters) or .001" in 100' (0.025 mm in 30 meters)
  • R-1307-2.4ZB Readout supports both wireless and cabled targets with a wireless range up to 150 feet (45 meters) with wireless range up to 150' (45 M).
  • System resolution of .00002" (0.0005 mm)
  • Self-centering target, accurate to .0012" (0.03 mm) and repeatable to .0002" (0.005 mm)
  • For higher accuracy applications (.001") the L-708 can be mounted externally using the L-111 Laser Stand with the L-102 Beam Translator
  • System handles a large range of bore IDs from 3.75" (92.25 mm) up to 40" (1,016 mm)
  • Windows-based Bore9 software with large color graphics to record and analyze bore straightness and alignment data.
  • Dynamic or live display of component misalignment
  • Portable enough to fit into small carrying case.
  • Laser runs for up to 8 hours on a standard, replaceable 9-volt battery
  • Optional A-510SM Small-Bore Target easily accommodates bores as small as 1.5" (38.1 mm)

Bore Alignment Applications

Compressor Bore Alignment

Compressor Bore Alignment

The L-708, combined with the L-111 Laser Stand and L-102 Laser-Beam Translator, are mounted outside of the compressor bore and our special version of the A-514 Self-Centering Bore adapter is used on the top and bottom 60 degrees of the “cut away” bores on the compressor to align the laser to the near and far bores. The target/adapter are then moved to the cross-head and other components to check and align the bores. With care, accuracies of 0.0005" (0.01 mm) can be achieved. The alignment is up to 50% faster and two times more accurate than tight wire methods.


Engine Cam/Crankshaft Bore Alignment

Engine Cam/Crankshaft Bore Alignment

The L-708 Bore Alignment Laser System has provided several automotive and diesel-engine manufacturers with a fast, reliable method of measuring the crankshaft bore for both straightness. The laser system has proven to decrease inspection times significantly and virtually eliminated dedicated, expensive gauging. The laser and target are adaptable to most crankshaft bore applications.

The L-708 and A-514 Self-Centering Bore Adapter are mounted inside the first reference bore of the engine block. The A-512 Target and second A-514 Adapter are mounted in the far reference bore and connected to the R-1307 Readout. The laser angle is adjusted until it reads zero. Now the laser is “bucked-in” (aligned to the references) and the A-512/A-514 is moved to internal bores for ultra-fast and accurate alignment checks. Setup time takes about 10-15 minutes and the entire alignment check can easily be done in less than 30 minutes.

Our Bore9 software documents the bore alignment, offering a step-by-step guide through the process, bore-to-bore and overall alignment tolerances and a report that shows if the bores are in or out of alignment.

Stern Tube Alignment

Stern Tube Alignment

The L-708 is also ideal for measuring the straightness of stern-tube bearing bores in marine applications. The laser can be used with two references: a) from the outside of the ship using the A-514 Self-Centering Bore adapter to mount it in either the aft strut bore or the aft stern tube bore, and then aligned to the forward stern tube bearing (or intermediate shaft bearing) and then shooting into the gearbox, or b) fixtured onto the gearbox shaft, aligned to the rotation axis and the laser is shot down into the stern tube. If the L-708 is combined with our T-261A 4-Axis Target and aligned to the stern tube bearings, it can calculate the shaft rotation axis alignment to the stern tube in four axes simultaneously, minimizing the number of moves during the final engine alignment!

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