ircon Modline 4, Installation And Operation Manual

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2–10
Section 2 — INSTALLATION
2.
9
ALIGNING THE MOUNTING AXIS
A MODLINE 4 is "sighted" on the target object by
aligning its mechanical axis so that its mechanical
centerline intersects the target at the center of the
desired viewing area. The optical axis is aligned
very closely with the mechanical axis. Thus, by
aligning the mechanical axis you are also aligning
the Cone of Vision so it is centered on the desired
viewing area.
Where very large target surfaces are involved (tar-
get size many times larger than spot size), align-
ment can be as simple as sighting along the top or
side of the casting and aiming it so it points rough-
ly at the center of the target. For more accurate
alignment, refer to the following instructions.
BASE MOUNTING
If you plan to mount the MODLINE 4 by its base
pad, project a straight line from the bottom surface
of the base pad to a point below the center of the
desired point of measurement on the target as
shown in Fig. 2.10. For a standard casting this
point should be 2.1 in. (53 mm) below the center of
the measurement point. For a water-cooled casting
it will be 3.3 in. (84 mm) below the center of the
measurement point. This establishes your vertical
alignment.
Align the mounting hole positions on the mounting
support 50 they form a straight line aimed at the
center of the desired measuring point on the target
surface. This establishes your horizontal align-
ment.
Note that these alignment axes and prepare the
mounting support. When the base pad is bolted to
the mounting support, the optical axis will be cen-
tered on the desired viewing area.
FRONT FLANGE MOUNTING
The second mounting method is to use the front
flange of the MODLINE 4 as the mounting surface.
The instrument's optical axis, which is coincident
with the mechanical centerline of its casting, is per-
pendicular to the front flange mounting surface.
The instrument should be mounted such that the
optical axis projects to intersect the target surface
at the center of the desired viewing area.
This method requires that you visualize a straight
line from the center of the lens to the desired cen-
ter point on the target. This line is the optical axis.
Erect a mounting support with surfaces perpendic-
ular to this axis. When the front flange is placed
against this mounting support, its line of sight will
be properly aligned with the target.
NOTE: The diagram shows the MODLINE 4 front
flange parallel to the target surface, and the optical
axis exactly perpendicular to the surface. However,
you can mount the MODLINE 4 so the optical axis
is at some other angle to the target. In this case
the "spot" will be elliptical rather than circular, but
as long as the target surface is large enough to
accommodate the widest axis of the spot, this will
not present a problem.