Model
55
28A
Straightness Measurements (
Along
A
Hori
zontal Axis)
10
-6
Procedure
NOTE
Use of the Gunsight Al
ignment
method is described In the
following
procedure
.
Once
you become familiar enough
with
a
lignmen
t
principle
s,
yo
u
may
wa
nt to start with
"Au
tore-
flect
io
n"
(descr
ibed
in Section
15
).
1.
Mo
ve
the machine
's
table (if it
mov
es)
as d
ose
as
po
ss
ibl
e to the
la
se
r Head.
Mo
ve
the
ma
chine
's
s
pindle
(
if
it moves)
iIS
I
~
r
~
po
ss
ibl
e away from the
la
se
r Head.
Note
that the " moveabl
e"
part
of
the
ma
chine may depend on the
ax
is you are measuring.
That
is
, the
"X
"-axis
mo
veable pari may not ne
cessa
rily also be the " Y"_axis
or
"Z"
-
axis
moveable
part.
This wi
ll
keep
the
ma
c
hine
from
hitting
the
la
ser Head during a
mea
surement and will help
es
tablish the
"near-end-of-travel"
.
2.
Visua
ll
y a
li
gn
the
laser Head
as
well
as
you
ca
n parallel 10 the direction of travel and position
it
at
an
appropriat
e heigh
t.
Some things to consider
are-
• Po
si
tion
for
an
axis
appropriate
for
what you
wa
nt
to
acco
mp
lish (revi
ew
Section 4
's
material
on
this
).
• If
yo
u
think
you
wil
l be
making
a Distan
ceor
Angular
mea
surement later, establish a
meas
urem
ent axis
at
II
height
abo
ve
the table Ihal
wi
ll al
lo
w
easy
inter
changing of
Ihe Optics. To
do
this,
mou
nt
the Straightness Reflector as s
hown
in Figure
10
-4,
and keep
the
Reflector
as
low
as
po
ss
ible on
its
lJase,
without
covering
up
the hole
in
the Reflec
tor
Mount'
s
Po
s
t.
Then position the
la
ser Head
so
its beam strikes the
ce
nt
er
of
the slot.
• Use "
Autoreflec
t
ion"
to
help
you do
thi
s once you become
profi
cient
at
la
se
r
System measurement
s.
If you usc " Auloreflec
lion
" you
won',
have to
do
any
further
al
ignm
ent. yo
u'll
only
need to check for beam strength (and remove slope,
if
you
don
't
u
sc
the HP
Dimen
sional
Metr
ology Analysis
Sys
lem
).
3. Decide
where
you
will
po
s
ition
the
Op
ti
cs
so
that:
•
Th
e
Interferom
e
ter
is
between
the Reflec
tor
and the laser Head. (Al
sosee"
OTHER
MOUNT
ING RE
QU
I
REMENTS
",
below.)
•
Th
e Int
er
ferometer
is
wh
ere the tool mounts.
•
Th
e Re
fl
ec
tor is where the workpiece moun
ts.
• The
Opti
cs
are
at
the " near
end
of tra
ve
l
".
(This meanslhat
an
y subsequent
motion
of
Ihe
ma
c
hin
e
wi
ll separate the opti
cs
further rather than bring them
clo
se
r
togcther
.)
(
See
Fi
gure
10-
2.
)
For Short range meas
ur
ements
thiS
sho
uld
be about
100
mm (4 inch
es
).
For
long
range measurements
Ih
is
shou
ld
be aboul
900
mm (3 fee
t).
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