Model
5526A
Distance Measurements
6-8
Procedure
1.
Move
the moveable pari
of
your machine
as
clo
se
to
the
la
ser H
ead
as possible.
NO
le
Ihal
the
"moveable
" part
of
the
machine may depend
on
the axis you are measuring.
That
i
s,
the
"X"·ax
is moveable part may not necessarily also be the "V"-axis
or
"Z"·
axis
moveable part.
This
will
keep the
ma
c
hine
from
hilfing
the
la
se
r Head
during
a meas
ur
ement and w
ill
he
lp
establish
the
"near
e
nd
of
travel
".
2.
Visually align
the
la
se
r Head
as
well as you c
an
parallel to the direction
of
travel and position it
at an
appropriate
height. Some things
to
consider arc -
• P
os
ition
for an
axis
appropriate
for what
yo
u want to
do
(review Section 4
'5
material
on this).
•
If
you
think
you will be
making
a Straightn
ess
or
Squareness measurement latcr,
establish a mcasurement
axis
at
a hcight above the table that will a
ll
ow
easy
inter
changins
of
the Optics. To
do
thi
s,
mount a RetrarefieclOr on a Height Adjuster
that is flush
with
the l
ap
of
the post s
upported
by the base; then
po
s
ition
the
la
se
r
Head
so
the
return
beam
from
the Retroreflector enters the laser Head's l
ower
port.
•
Use"
Autoreflcc
tion" to help you
do
this once you
be
come
pr
oficient
at
la
ser
Systcm measurements.
If
you
u
se
" Autoreflec
tion
" you
won't
have
to
do
an
y further
a
li
gnme
nt
, you'
ll
on
ly need to check f
or
beam strength and
cos
ine e
rr
or once you
ha
ve
installed the
Opti
CS.
3.
Decide
where
you will
position
the Optics
50
that :
• The I
nterferometer
is
between the Refl
edor
and the laser Head.
•
On
e
Optic
is
where
the tool mounts and the o
ther
is
where
theworkpie
ce mount
s.
• The
Opti
cs
are
at
the " near end
of
tra
ve
l
".
(This means thai
an
y subsequent
motion
of
the
ma
c
hin
e
will
separate the
Op
t
ics
further rather than bring them
doser
together.) (
See
Figure 6-4.)
• If you want
to
meas
ure
perpendicular
alCes
from
the same laser H
ead
po
si
tion,
position the
Int
erferometer
on II part
of
the
ma
chine that remains stationary and
can
se
rve
as
a
beginnins
point
to
mea
sure th
ese
axes.
(
See
Figure 6-9. )
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