2
Both the A-1511 and T-218T measuring targets are very repeatable. However, in our experience, the A-
1511 is much faster at taking the measurements. To get the best repeatability, some mechanism should be
employed to ensure that each point on the diaphragm or other component is marked and the measuring tip
is placed exactly on the same point. Given that the surfaces inside a turbine are usually pitted and rough,
a radius tip should be used. For new turbine installations, repeatability of .001 in. (0.025 mm) or better is
easily achievable. However, for older turbines, it becomes increasing more difficult to hold .001 in.
repeatability because of the high level of pitting and corrosion.
The L-705 Laser
The L-705 Laser has been designed
with a .750 in. (19.05 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. (19.05 mm) hole on center
is all that is needed to hold the laser
(the extruder package includes a self-
centering chuck fixture). In fact, the
laser replaces the first reference target
that a typical borescope would need.
L-705 Features and Setup
The L-705 has a range of 50 ft. (15 m),
and under good environmental
conditions, it is accurate to .001 in.
(0.025 mm) over the whole range. By
carefully following the NORMIN
procedure described in Appendix A,
accuracies of .0002 in. (0.005 mm) in
10 ft. (3 m) can also be achieved.
The L-705 has a range of 50 ft. (15 m), and under good environmental conditions, it is accurate to .001
in. (0.025 mm) over the whole range. By carefully following the NORMIN procedure described in
Appendix A, accuracies of .0002 in. (.005 mm) in 10 ft. (3 m) can also be achieved.
The L-705 provides a straight reference line to which any bore or extruder barrel can be aligned and
measured. The laser mounts in an adapter. The laser and adapter, in turn, are mounted in either in the
bore or the counter bore of the gearbox spindle. The laser projects a beam through the adapter and down
through the inside of a bore or barrel toward any of Hamar's bore targets, which are mounted in the
opposite end of the bore or the free end of the extruder barrel. The laser beam is then adjusted (qualified)
to project the actual axis of rotation of the gearbox.
The following describes the operational features of the L-705 Laser. These features include bubble level
vial orientation, micrometer values and settings, ON/OFF switches and the external battery pack.
•
The ON/OFF slide switch
has a lighted LED to indicate that power is ON.
•
The Pulse/Continuous switch
selects the laser mode compatible with the readout/interface being
used (see Page 6 for more information about Pulse/Continuous modes and the readouts used for each
mode).
•
Battery Pack connector
accepts a slip-fit probe with a flexible cord.
Figure 1 –
L-705 Laser
