Gyro erection procedure
RESTRICTED
Fig. 67
With gyro hot and erected to the vertical,
bubbles should read zero.
The bubble may
underneath the
mounting brackets with
paper,
or in the case of a new bubble
tube, the
underside of a
high side of the bubble may be
stoned.
ERECT TELESCOPE TRANSVERSE CROSS HAIR TO THE/C
VERTICAL.
1.
Level small tripod mirror over center grid
dowel pin
(Grid has been removed).
2. With gyro
in the
vertical
as in last para-
graph, set telescope indicator to exactly zero.
3.
Turn eccentric screw
in #l sheave until
transverse hair
bisects
image of lower end of
telescope tube in mirror.
M. ERECT FORE AND AFT CROSS HAIR TO THE VERTICAL./
1.
Tripod mirror is leveled as above, tele-
scope
indicator is slightly off zero and
gyro is
verticalset in exactiy zero drift.
Tilt telescope until fore and aft hair bi-
image of lower end of telescope tube.
To divide backlash.
a)
Set in 10°
right drift and come back
to exactly 3å right drift.
Turn trail arm to place fore and aft
hair tangent
hair tangent to image of lower end of tube.
Repeat step (a) with
left drift.
d) Fore
and aft hair should be tangent
but if it is not, correct
for half the error by tapping the telescope tube
lightly with an orange stick.
e)
Reset the fore and
aft hair tangent
to the image with trail arm and repeat steps (a)
and
(c) .
ret
f)
screw.
g)
Tighten cross trail clamp lever tur-
Recheck.
N.
SHAPE FLEXIBLE LEADS.
1.
2.
3.
seti.
Use orange sticks.
Make no sharp bends.
Shape
leads exactly the same (in each
Leads
should not touch each other or any-
thing else, when gyro is moved through its limits.
both
be
shimmed
L.
M,
ERECT
FORE
AND
AFT
CROSS
HAIR
TO
THE
2.
Set
in
exactiy
drift.
3.
sects
b)
c)
to
other
side
of
image,
191