Model
5528A
Straightness
Measurement
s
8. Position the Reflec
tor
and Turning
Mirror
relative
to
the Re
tr
oreflector
and
Interferometer
,
as
follows-
a. Bring the Interferometer/
Re
lr
orcfle
c
lor
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
si
de.
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
se
tting provides
.).
10.
Visually align the
la
se
r 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
sc
rews
at
its
base
until
the
la
ser 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
Re
lr
orefiector
, 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 s
hould
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
Reflec
tor
to
see
the
dOls.
13
.
Move
your machine (
or
sl
ide the
Turning
Mirror
/ Reflector assembly) back and
forth
(
or
s
ide
-
to
-s
ide)
untillhe
laser beam hits the
junction
of
the
Reflector
's
mirrors and is ce
ntered
in
the
slo
ued
opening
. You will need to
se
parate the
Optics
to about
75
mm
(3
inche
s)
for
Short
Range,
or
about
600
mm
(2 feet) for
long
Range,
in
order
to
do
thi
s.
If
the
Interf
erome
ter
dip
s the beam after this adjustment. readjust the tilt
of
the
Turning
Mirror
, using
its
small
sc
rew
s,
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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