L-706 Small-Bore Alignment Laser System

Hamar Laser’s L-706SM Small-Bore Laser Alignment System is highly accurate and unparalleled for ease of use. It has been designed to work on very-small, bore-diameter applications to work with our 4×4 mm PSD targets. It is used primarily on short length, small diameter applications, such as heat exchangers, tube-sheet bore straightness measurements and large caliber gun barrel straightness. The L-706SM may be used at distances up to 15 ft (4.5 m).

System Highlights

  • Fast: 15-minute setup time. Measure each bore in seconds!
  • Easy: Customized self-centering bore targets are easy to insert into tight spaces and do not need to be inverted to calculate results.
  • Simple to learn: Use simple X-Y readouts to view the data. No “black boxes” needed!
  • Versatile: For diameters from .75 to 2.0 in. (17.75 to 50.8 mm). Larger bore IDs can be accommodated with our other self-centering bore targets: A-510, A-512 and A-516.
  • Bore9 Software: Record bore alignment and calculate straightness data using Windows-based Bore9 Software, and provide printed reports.

Key Features

  • 15-minute setup time. Measure each bore in seconds.
  • L-706SM Operational Range: 1 to 15 ft (0.3 to 4.5 m).
  • A-220 Customized Self-Centering Bore Targets are easy to insert into small bores and do not need to be inverted to calculate results.
  • Small-bore targets accommodate a range of bore diameters from .75 to 2.0 in. (17.75 to 50.8 mm) or more.
  • R-1307 Readouts with .0001 in. (0.001 mm) resolution update in real time as the bore is adjusted.
  • Add a second readout to transmit readings wirelessly up to 200 ft (61 m).
  • Optional Bore9 Software aids with setup, records bore data and analyzes the alignment results.
  • Optional large-bore targets can align bores from 2 to 40 in. (50.8 to 1,000 mm)
  • Optional spherical-bore “virtual” targets with customized adapters for easy and fast alignments.
  • Durable and rugged, designed to last many, many years of service.

If you do not see your application listed, please contact us to discuss your requirements. We will be more than happy to provide a solution that’s right for your unique alignment problem.


Automotive, Marine & Locomotive Engine Blocks

  • Crankshaft and Camshaft Line Bores
  • Cylinder Straightness

Manufacturing & Metalworking

  • Deep-Bore Straightness Checks on Parts, such as large caliber gun barrels or heat exchanger tube-sheet bores


  • Artillery Gun Barrel Straightness Checks


  • Small-Bore Extruder Barrel Alignment
  • Small-Bore Extruder Bore Straightness and Wear

Simple Fixturing for Fast Setup

The L-706 Laser has been designed with a .750 in. (19 mm) mounting stud and flat face with magnets to hold it flush to fixturing. Since the laser beam is concentric to the OD to within .0005 in. (0.01 mm), a simple flat face and .750 in. (19 mm) hole on center is all that is needed to hold the laser (the extruder package includes a self-centering chuck fixture).  The laser comes with a 2 mm laser-beam diameter to work with the T-220’s 4×4 mm PSD.  Due to the small size the laser limited to about 15 feet (4.5 m) for most small-bore applications.

Patented, Self-Centering Target Bore Adapters

The L-706 system uses our patented self-centering target technology for the T-220 Target.  Self-centering bore targets use no moving parts to self center in a bore and take just seconds to position the target in a bore for an accurate measurement down to .0005 in. (0.01 mm).  This eliminates the annoying 0 and 180 measurements needed for typical bore targets.

  • How Hamar Laser Self-Centering Bore Adapters Work

T-220 Target Designed for Small Bore Diameters

The T-220 Self-Centering target can measure the alignment and straightness of bores from .75 to 2.0 in. (17.75 to 50.8 mm).  The target comes with a 4-foot (1.2 m) pole for insertion deep into bores.  Pole extensions are also available.

Highest Bore Alignment Accuracy

Hamar’s bore alignment systems are the most accurate in the industry.  Our patented, self-centering targets combined with ultra precise lasers means accuracies down to .0003 in. (0.0075 mm) in 10 feet (1 m) are no problem for our line of bore alignment lasers.

Good Angular Adjustment Range

The L-706 Laser has an angular adjustment range: ±0.06° (± .0125”/ft. or ± 1.04 mm/m) and is used on applications under 40 feet (12 m), such as extruder barrels and hinge-line bore alignments.

2-Axis Readout with High Resolution

The R-1307B 2-Axis Readout has .0001 (0.001 mm) resolution with LED displays that can be seen from 10 feet (3 m).  It features 9 hour battery life and the ability to change display resolution and system averaging.  The R-1307B-2.4ZB  version adds a 2.4 GHz radio to transmit the data to our Bore9 Software for recording and analysis.

Bore9 Software for Recording and Analysis

Hamar Laser’s Bore9 software records alignment (concentricity) data for up to 50 bores.  It also measures straightness of cylinders and can measure diameter changes when used with our self-centering targets in Measure Mode.  It supports all of Hamar’s past and present bore alignment equipment and features a step-by-step guide to help the user through the software.