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l
5528A
Angular Measurements
8·
4
3. Finally,
you will check your alignment
to insure
the
';Important
Considerations" number
"5"
has been fulfilled
.
Procedure
NOTE
Use of the
Gunsight
Alignment method
is
described
in
the
following procedure. On ce you become
familiar
enough with
alignment
principles,
you
may
want
to
start with
"Autore-
flection
"
(described in Section
15)
or
to
align
by
the same
philosophy
as
the
"
Gunsight
"
method, but without
targets.
(Your entire interferometer opening would be the
inlcrfero-
meter target
and
the laser
Head's
return port target
would
become
the Reflector's
targeL
)
1.
Move the moveable part of your
machine
as dose to the
l
aser
Head
as
possible.
Note
that
the
"moveable"
part
of
the machine
may depend on
the
axis
you are measuring. That
Is,
the
"
X"
-axis
moveable
part
may not
necessarily
also be
the " Y"-aKis
or
"Z"-aKis
moveable
part.
This
wi
ll
keep the machine
from
hilling the laser Head
during a
measurement
and will
help
establish
the
"
near-end-of-travel
"
.
2.
Visually
align
the laser Head as
well as you can parallel
to the direction of travel
and position it at
an appropriate
height.
Some
things to
consider
are
-
•
Position for
an aKis appropriate
for
what you wanltodo (review Section
4'5
ma
terial
on
this).
•
If
you
think
you will be
making
II
Straightness or Squareness
measurement
late r,
establish
a
measurement
axis al a
height
above
the
table that will allow
easy
inlerchangeabilily
of
the
Optics
.
To do
this,
mount a
RelrorefieClor
on a
Height
Adjuster that is flu sh
with
Ihe top of
th
e
post
supported by the base;
then position the
laser Head so the return
beam from
the
Retroreflector
enlers the laser
Head's
lower
port.
•
Use
"
Autoreflcction"
to help
you
do
this
once you
become proficient
at laser System
measurements.
If
you use
II
AutorcflCClion
"
you won't
have
to do
any
further
alignmen t, you 'll on ly
need to check
for beam
strength.
3.
Decide
where
you will
position
the
Opti
cs
so
,hal:
•
The Interferometer is
between the Reflector and
the
laser Head
.
•
One Optic
is
where
the
tool
mounts
and the other
is
where the workpiece moun
ts.
•
The
Optics
are
at the "ncar end of
tra
vel
".
(This means
Ihal
any
subsequent motion of
Ihe machine
will separate
the
optics
furthe
r
rather than
bring
them
doser
together.)
(See Figure
8-2.)
• If
you want
to measure
perpendicular axes from the same laser
Head position
,
position
the Interferometer on a part of the machine
that
remains stationary
and can
serve as
a beginning
poinllo measure
these
axes.
(See Figure 8-9 and
Fisure
8-10.)
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