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Model
5528A
5quareness
Measu
rements (In
it
Vertical
Plane
)
13-18
2.
Make
sure you
input
a calibration
factor for the Optical
Square
to the HP Dimensional
Metrology Analysis
System's
program
,
if
you
use that
system,
You will find the
calibration
number next to
the seri31
number
on
the
Square's front
surface.
Procedure
Since
a
Squareness
measurement
requires co
mparing two
Straightness
measurements,
you
must
have the measurement data from the first a)Cis available for
comparison
with the
seco
nd-axis
data,
This
is easily
done
with
the HP
Dimensional
Metrology Analysis
System,
Refer to the
Analysis
System's Operating Manual and
programs
for exactly
how
to
record
and store
the data for
t
his
first
axis.
If
you don't
use
the
HP Dimensional Metrology
Analysis System,
follow
the
instru ctions
in
Section
10 for
"
PROCEDURE
",
under
"
MAKING A
MEASUREMENT".
Then refer
to
Section
21
of
this
User's Guide
to help
you
ca
lculate
Square
ness from
your
data.
What Affects Accuracyl
1.
See
the information presented under thi
s
heading
in
Section
10
of
thiS
User's
Guide.
2.
The
orientation of
the
Optical Square
relative to the laser beam
is very important.
Any
ansulClr
misalignment
(eve
n a few minutes
of a
degree
)
will induce
errors
in
your
measurement. To
prevent
this from
happening,
secure
the
Optical Square against
parallels
in
T slots or
other
similar
machine
fea
tures
that are
square
relative to the
machine's
motions.
SECOND-AXIS MEASUREMENT (Horizontal Axis)
This second-axis measurement is merely
a vertical Straightness
measurement
along
a
horizontal
axis (see
Figure
13-12), Thus,
you
should
use
the
instructions
given
in
Section
10
of
this
User's
Guide (or
in
Section
11
,
if your machine
has a
horizontal spindle
and you arc
measuring
"Z- Y"
Squareness), and add to
that
(where
appropriate)
the
information below.
Installation and Alignment of
Optics
Procedure
NOTE
Do
not move or adjust
the
Straightness
Reflector
from its
position
after
the
first measurement
1.
Remove
the Optical Square, Turning Mirror,
Interferometer
and
Relrorefl
ector.
2.
Moun
t
the Interferometer (and
the
Relroreflector
if
the spindle
is
horizontal
)
where
the
loot
normally mounts.
3.
Adjust the
laser Head
to
line
up with
the
new
measurement
axis. The output
beam should hit
the
junction of
the
Reflector
mirrors.
and the
reflected beam
should
hit the La ser Head's
exit
port
.
a.
Trillnslale the laser Head
so
that
the
o utpu
t
beam goes
through the In
terferometer and
st rikes
the
junct io
n
o
f
the
Reflector
mirrors.
b.
Rol al
e the la
ser
Head
so
Ihat Ihe
reflected
beam
strikes
the center
of
ils exit port.
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