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Model
5528A
Straightness
Measurement
s
8.
Position
the
Reflector
and
Turning Mirror relative to the Retroreflector
and
Interferometer,
as follows-
a.
Bring the
Interferometer/
Relrorcfleclor assembly close
enough
to the
Straightness
Reflector to line up the Interferometer with the junction
of
the Reflector's mirrors.
Also
position the Interferometer
in
the
other
axis
so
its
opening
is positioned in the
center of the
Reflector's
slot.
(look
straight
down into the Reflector
and
make
sure
the
Interferometer's opening is
in the
middle.)
This is
a very important step.
If
the
Optics are
not physically lined up at this point,
aligning along the vertical
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
increase the distance between the Optics.
b.
Make
sure the
Reflector is
square
relative to the machine
and
to the Interferometer
(within
±
5
degrees),
and
then secure
the RefiectorlTurning
Mirror assembly
to the
machine.
c.
Make
sure
the Turning Mirror is
square
relative to the
Reflector,
and
is
nOl
lilted 10
either
side
.
9.
Switch
10 the large
aperture on
the Laser Head
's
exit
port,
and set
the turret ring to
"
OTHER
".
(When aligning
your set up
it is
good
practice to
work with
the
strongest possible
beam,
which
this
setting provides
.).
10.
Visually align
the laser Head as
well
as
you can
parallel
to
the machine's table,
and
position it
to have the
beam strike
the
center of
the Turnins
Mirror's
opening.
(Use
the
Interferometer's
target
or
a
piece of
paper to help
you to
this.)
11.
Adjust
the TurninlS
Mirror's
position
with the small
screws
at
its base
until the
laser
beam
goes
throush the
small
alignment ring
on
the
Reh
oreflector, find
passes
through the
Interferometer
without
being
dipped.
(See
Figure 11 ·6.
)
To do this
-
a.
Get
the beam to
go
through the
alignment
ring.
b.
look at
the
side
of
the Interferometer
facing
the
Relrorefiector,
and adjust
until
you
see
no red
reflection.
12. Orient the Interferometer bezel
's
scribed
line
90
degrees to the
Reftector's
slotted opening.
Two dots should
appear on
the
Reflector's
front
surface
unless
the
Optics are quite
dose
together.
(See
Figure 11-7.
)
If
so,
insert a piece
of
paper acrOS5 the front
of
the
Straightness
Reflector to
see
the
dOls.
13.
Move
your machine (or
sl
ide the Turning
Mirror/
Reflector
assembly
)
back
and
forth
(or
side-
to-side
)
untillhe
laser
beam
hits
the
junction of
the Reflector
's
mirrors and
is
centered in
the
sloued
opening.
You
will need
to
separate the
Optics
to
about 75
mm
(3
inches)
for Short
Range,
or about 600
mm
(2 feet)
for long Range
,
in order to
do
this.
If
the
Interferometer
dips
the
beam
after
thi
s
adjustment.
readjust the tilt
of
the Turning
Mirror,
using
its
small
screws,
and
then
try
again to move the
entire
assembly
so
the two
beams
line up
on
the
junction of
the mirrors
.
11-11
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