Objective focusing mechanism

Page Title: Objective focusing mechanism - Daylight
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MIL-P-48619(AR)

specified torque to the eccentric. Then, while still observing the

eccentric, apply, in a counterclockwise direction, the specified

torque to the eccentric. To conform to the requirements of 3.5.8,

there shall be no rotation of the eccentric when observed during

each torque application.

4.6.2.9 Objective focusing mechanism - Daylight. -Back off the

locking screw of Housing 11727432 a minimum of two full revolutions

from its locked position. Torque shall be measured while rotating

the eccentric through the range specified in 3.5.9. The running

torque required to rotate the eccentric shall conform to the

applicable requirements of 3.5.9 for the temperatures indicated.

Upon completion of this test, return the eccentric to the position

in 3.8.2 and torque the locking screw as specified in 3.5.8. Peri-

scopes which have passed the above tests of 4.6.2.1 through 4.6.2.9

inclusive, shall be subjected to the tests in 4.6.3.

4.6.3 Vibration/Shock (Periscope].

4.6.3.1 Collimation, Pre-Vibration/Pre-Shock setting. -This test

and the following test of4.6.3.6 shall be performed with the

periscope positioned and adjusted as in 4.6.6. Prior to performing

these tests, disengage the index pin "D" from the index plate of the

test fixture and place the 10 second level on Surface "C" of the

leveling base. The bubble of the level shall be centered within its.

graduation lines. If it is not, then further adjustment is required

in accordance with the procedures prescribed in paragraphs 7 and 8

of the set-up instructions contained on Dwg. 8247391. With the

index pin "D" disengaged from the index plate and surface "C" of the

leveling base level, view through each periscope eyepiece (daylight

and passive) and obtain coincidence of each periscope reticle bore-

sight cross respectively, and the projected target image cross-lines

by means of the boresight knobs (do not slip knob scales). When

coincidence has been obtained, record the boresight knob scale

settings for use in the test in 4.6.3.6.

NOTE:

Insure that knob scales are not disturbed (re-slipped) from

their original recorded settings throughout remainder of

tests herein.

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