TM-9-1240-401-34-P
TELESCOPE MOUNT M146: M118A2 AND M118A3; TELESCOPE MOUNT M145: M145A1; PANORAMIC TELESCOPE: M117 AND M117A2; FIRE CONTROL QUADRANT: M15; PERISCOPE: M42
TECHNICAL MANUAL; DIRECT SUPPORT AND GENERAL SUPPORT MAINTENANCE MANUAL
JULY 1993
TM-9-1240-401-34-P - Page 164 of 590
4-50
TM 9-1240-401-34&P
4-24. M145/M145A1 TELESCOPE MOUNT FINAL INSPECTION AND ADJUSTMENT
- continued
a. SETTING UP AND ADJUSTING THE CROSS-LEVELING FIXTURE - continued
10
11
12
13
14
Mount setup gage (10) on fixture adapter (6), and
secure with four mounting bolts (11).
Install collimating telescope (12) in setup gage
(10). Snug up thumbscrews (13) securing
collimating telescope (12); do not tighten at this
time.
Suspend a plumb line approximately 25 feet
(7.62m) directly in front of collimating telescope
(12).
Revolve collimating telescope (12) until its vertical
line is superimposed on plumb line. Tighten thumb-
screws (13) holding collimating telescope (12).
Fabricate rigidity test target (14). Use the following
formula for target fabrication of test target:
TARGET DISTANCE
1 MIL GRADUATION
= (IN INCHES )
1000
GIVEN:
TARGET DISTANCE = DISTANCE FROM
SIGHTING DEVICE TO PLACEMENT OF
TARGET.
EXAMPLE:
1 MIL
= 50 FT x 1 2 IN/FT = 0.6 IN
GRADUATION
1000
0.25 MIL = 0.6 IN X 0.25 = 0.15 IN
1.50 MIL = 0.6 IN X 1.50 = 0.9 IN
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