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Model
SS28A
Squareness
Measurements
(In
A Horizontal Plane
)
12-8
Figure
12-4.
M
ounting
of Oplical Square
5.
Position the
Straightness Interferometer
relative to the
Optical Square.
•
Bring the Interferometer close
enough
to the
Optica
l
Square
to
line
up the
I
nterferometer
with
the center
of
the Optical
Square's
slot. Be
sure
it is
centered
in
both axes
i up-and-down,
and side-to-side).
•
This is
a very
important
step.
If the
Opti
cs are
not physically
lin
ed
up at this point,
aligning
along the travel
axis will
be
impossible.
•
Be
sure
this
establishes
the
"
near
end of
travel", I.e.,
that any later movement
of
the
machine
can only
in
crease
the distan
ce
between
the Opti
cs.
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