HAMAR LASER STEALTH Series, General Training Manual

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Appendix H – Centering the Targets on the Floor
Monuments
When performing roll alignments, it is
often necessary to use floor benchmarks
at the side of the machine as a reference.
Hamar Laser offers floor plates on which
to mount targets so that these floor
benchmarks may be used as a reference.
When using these floor plates, the target
center must be mounted over the pointed
set screw on the bottom side of the floor
plate. This is accomplished via the
NORMIN method, described in
Appendix B, beginning on Page 73.
There are three centers involved: the
target center, the laser beam center and
the true bore center (or the rotational
center). You must determine the amount
that the target center is off from the rotational
center, and then move the laser center to be
coincident with the rotational center.
The target can then be electronically centered,
so all three centers are coincident as shown in Figure
39. This is accomplished by recording a target reading
with the target facing in one direction and then rotating
the floor plate holding the target 180 degrees and
recording the target reading again, as shown in Figure
40 . The two recorded readings are averaged by adding
them together and dividing by 2. This average becomes
the
Set Point
. The laser is then adjusted until the
readout displays the Set Point number, which makes the
laser beam coincident with the rotational center as
shown in Figure 41.
When the laser center is coincident with the rotational
center, the readings and the signs (+ or -) will be the same
when the target is rotated from one position to the other,
as shown in . You can then zero the target and all three centers will be
coincident, as shown in Figure 42.
1. Place a floor monument on a specific point by ensuring that the
pointed set screw that is directly underneath the target
centerline is firmly positioned into an indentation in the
surface.
Be sure that the target face is square to the laser beam. This is a
user call. There is no specific method of accomplishing this.
Figure 39 – Target Centered
Figure 40 – Target Rotated
Figure 41 –
Laser Beam Coincident
with Rotational Center