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Model
5528A
Flatness
Measurements
9-6
3.
Draw a
" map"
of the Surface
Plat
e.
The
map
shou
ld
be drawn
on
a
sheet
of paper
with
highlights
loca
ted
o
n
th
e
surfa
ce
plate
itself with
Icad
pencil
.
Ta ke care not to
put
markings
directly on
the
grid
lin
es,
sin
ce
the
equipment
must
be
fr
ee
to
slide
o
n th
e
granite surface
alo ng these
lines
.
The
grid
system must
contain the
eig
ht
basic
lines,
as
show
n
in Figure
9-4.
The
le
ngth
of
each
line
in this grid
should
be an
cven-i
nteger
("2",
"4",
elc.
)
mul tiple of
th
e
lengt
h
of the
Footspacer
to
which the
Angu lar
Rellector
is
attached.
For a
very
large
Surface
Pl
ate,
you
will probably want
to
use
a
larger
Foolspacer,
sin
ce measureme nts
points will
be
determined by
e
nd -Io-end
positioning of
the
Footspacers.
There shou
ld
also
be a 7.S
an
(3-
inch)
margin between the outside
of
the
grid and the edge
of the
Surface
Plale on
three
of
the
sides,
and
a
10 cm
(4-inch)
margin
on
the
side
thai will be
in
line
with
the
laser
Head.
Figure
9-4.
Grid
Map
of Surface
Plat
e
4.
Align
the laser Head. usi ng the"
Aut
o
reflection
"
method
.
parallel to
the surface
plate and to
perimeter line
loGE",
7.5
em
(3
inches
)
oUlside the grid.
(This
is
2.S
em
(1
inch
)
in
from
the
edge
of
the
Surface
Pl
ate, as
shown in
Figure
9-5.)
3.
Place
o ne
of
the Flatness
Mirrors
so
the
long edge
of
it
s
base
is
flu
sh
with
th
e edgeoft he
Surface Plate and parallel to
lin
e
"G E".
b.
Turn
th
e
Flat ness Mi rro
r until
the
mirror
is
perpendicular
to
the
edge
of the
surface
plate,
and
faces
the
l
aser
He ad.
c.
Visua lly align the
laser
Head
so its
beam
hils
the
mirror.
d.
Turn
to
Section
1S
in
this
User's Guide.
and
follow
the in
stru
ctions for
" AUloreflection",
sta
rtin
g
al step
"
4",
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