MIL-DTL-48550A
when the test value is applied. At the extreme operating temperatures of 3.4.2, the knob
locks shall be able to be locked and unlocked by hand.
TABLE I. Knob locks.
Lock control
Torque to secure
Test value
(inch pounds)
Rotate collimator on tripod
25
50 inch pounds of torque
Cross level the collimator
25
50 inch pounds of torque
Elevate the collimator
25
10 foot pounds of torque
Telescope of tripod legs
25
40 pounds of force
3.7.7 Telescope alignment. With the lock released the minimum torque required to
rotate the scope to center the level vial shall not be less than 3 inch pounds and the
maximum torque required shall not exceed 22 inch pounds when checked at standard
ambient temperature of +60°F to +90°F. The maximum torque shall not exceed 35 inch
pounds when checked at the extreme operating temperatures of 3.4.2.
3.7.8 Azimuth fine adjustment knob.
3.7.8.1 Azimuth fine adjustment knob torque. The torque required to operate the
azimuth fine adjustment knob shall not exceed 5 inch pounds when checked at standard
ambient temperature of +60°F to +90°F and shall not exceed 10 inch pounds when exposed
to and checked at the extreme operating temperatures of 3.4.2.
3.7.8.2 Azimuth fine adjustment knob durability. With the azimuth fine adjustment
knob at its extreme travel position (both in and out), the adjustment assembly shall
withstand a torque load of 25 to 30 inch pounds, without stripping the threads within the
adjustment assembly when checked at standard ambient temperature of +60°F to +90°F.
3.7.9 Fastening devices. Catches and similar fastening devices used to secure the
cover shall function without interference and shall securely fasten the cover to the base
when secured.
3.7.10 Carrying handle. The carrying handle shall be securely attached and show
no evidence of looseness of assembly.
3.7.11 Strap security. The strap shall be subjected to a direct pull of 25 pounds at
90 degrees to the securing surface, the strap shall remain secure, the rivets firm, and the
cover shall subsequently meet the requirements of 3.4.4.
3.7.12 Gasket. The rubber gasket at the base of the cover assembly shall be
securely attached and show no gap where ends meet.
3.8 Workmanship. Workmanship of the collimator shall be in accordance with the
requirements of MIL-F-13926.
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