3-10. NIGHTSIDE TEST BENCH 2A3 BORESIGHT DISPLACEMENT MEASUREMENT. (CONT)
When mounting alinement tool, apply equal force to both sides above
guide pins. Do not allow it to tilt to one side, or binding and possible
damage to guide pins will result.
(b) Mount alinement tool on insert/adapter. Ensure that both mating surfaces are in full
contact with each other.
(c) Set torque wrench to 100 in-lb and use torque wrench to tighten clamp assembly. Ensure
that alinement tool is secured to insert/adapter by checking for no free movement between
b. Boresight Displacement Measurement.
If telescope focus cannot be obtained, have nightside alinement tool
assembly calibrated by appropriate personnel.
(1) Looking through telescope eyepiece (1, figure 3-3), adjust eyepiece clockwise and
counterclockwise until reticle (2) and target (3) are in focus.
(2) Looking through eyepiece, determine amount of boresight displacement by comparing target
position (1, figure 3-4) to numbers on X and Y scales around reticle (2).
Figure 3-3. Telescope, Reticle, and Target