TM 9-1290-357-15
title, loosen the screws, holding the collimator
leveled support plate of the fixture. Direct the
until it is perfectly plumb to the telescope reticle.
line-of-sight of the telescope at a plumb line,
Tighten the screws holding the collimator. Re-
loosen the locking screw of the holder, and rotate
move the surface gage with attached holder and
the telescope until its vertical reticle line coin-
telescope from the support plate.
cides with the plumb line along its entire length.
Tighten the holder locking screw.
e. Install a suitable adapter, simulating the
tripod support tube, on the support plate of the
fixture (fig. 43) with the three cam lock screws.
lescope (fig. 45) is directed into the collimator
f. Adjust the knurled objective scale of the col-
limator (fig. 41) to indicate between 30 and
absolutely plumb to the collimating telescope re-
150 yards.
Tolerances
Rebuilt
Limit
New
of
Item
instru-
instru-
Condition
ments
service-
ments
ability
Focusing sleeve
Approx
Middle of movement for
0.05
Approx-
sharp focus (inch).
imate
imate
center
center
Line of sight
1
0.33
0.5
0.5
Bubble of tubular level central
line of sight is
horizontal (mil).
Horizontal travel (line of
sight returned to target
by means of fixture);
Vertical deviation
1.5
1
1.5
when rotated by
azimuth mecha-
nism (mil).
Vertical deviation
0.75
0.75
0.5
when rotated by
orienting mecha-
nism (mil).
Vertical deviation
0.75
0.75
0.5
when rotated about
vertical spindIe (mil).
Vertical deviation
2.25
2.25
1.5
when rotated by
any combination
of above (mil).
Vertical deviation
0.5
0.5
0.3
when reversed by
azimuth or orient-
ing mechanism (mil).
Vertical travel (mil)
0.75
0.75
0.5
Parallel to vertical plane
0.5
0.5
0.5
through needle pivot
and indexes (mil).
Bubble central when
Same
Circular level
Same
With-
in
azimuth scale lies in
horizontal plane.
limit
of
etched
circle
0.5
0.5
0.5
Reticle
Verticality of vertical
cross line (mils).
See footnote at end of table.
