Leveling procedure
RESTRICTED
Fig. 65
10. Turn
4 to
9, inclusive.
wil! not be done with the
be done in the renalin, nd
On 3-legged stands,
leveling
remaining leveling bolt.
Stand should now be level, throughout 360°.
H. LEVEL STABILIZER.
1. Mount stabllizer on head of stand.
Place
sight stem
surface plate
sight
stem bushing.
3.
Place
precision level on plate and
stabilizer
bubble will remain on
level is
rotated
throughout 360°.
be placed
parallel with
diagonal boleye! should
L. MOUNT SIGHT ON STABILIZER.
1. Clamp directional connecting rod
I to
pointer with course
centering marks aligned.
2.
Set zero drift.
Fig. 66 J. ERECT GYRO TO VERTICAL.
En minutes tow gyro
1. Allow gyro to warm up for approximately
80 minutes to reach operating temperature in order
that gyro will
be hot when gyro bubbles are check-
ed for level.
2.
Turn switches off, allow gyro to come to
a stop, then remove
upper
half of sight housing.
3.
Loosen cross trail clamp jever turret head
screw just enough sothat the telescope cradle may
independently of the gyro but not
so much
cradle won't stay in any position
in
which it is placed.
wedges or clamps,
fix gyro approx-
imately
vertical.
use bubbles as
reference.
Place three-legged surface plate on top of
Gyro housing and precision level on surface plate.
6. Level surface plate by moving gyro on its
bearings.
If wedges are used, tap very lightly on
gyro when
erecting it, using
fiber drift, and
on wedges when
driving them fast.
Be careful about surface plate. If wedges
slip, surface
plate and level will fall, probably
doing
damage to themselves as well
as to the
sight.
K. CHECK GYRO LEVELING BUBBLES.
repeat
steps
2.
in
shim
untii
zero
as
diagonal
boits.
be
that
the
5.
7.
also
8.
much
189