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|  MIL-M-70453A
(AR)
elevation accuracy of the mount shall conform to the requirements
of 3.7.6.1 and meet the requirements of 3.6d.
4.7.6.5 El evation backlash. Perform this test in sequence
to the test in 4.7.6.4. At each of the selected elevation
settings, record the elevation (mil) value when the reticle lines
are coincident with the target lines. With backlash excluded for
direction of travel, override the target line (horizontal) by
approximately 50 mils utilizing the elevation knob of the mount.
Then, with backlash included, reverse direction of the elevation
knob of the mount. Then, with backlash included, reverse
direction of the elevation knob and reestablish coincidence of
the reticle and target lines (horizontal), without Overtravele
Again record the elevation (mil) value as read on the scale and
micrometer knob. The difference between the first and second
recorded (mil) value is the amount of backlash. At the selected
elevation setting, the amount of backlash for that elevation
position shall not exceed the tolerance specified in 3.7.7.1.
Perform the elevation backlash test at each of the selected
elevation settings tested in 4.7.6.4.
4.7.7 Orientation. azimuth ac cur acy. The testing equipment
specified in Table IV shall be utilized in performing the azimuth
accuracy tests. The azimuth test fixture shall be positioned on
a vibration free surface and cross leveled in the horizontal
plane by means of a certified 10 second level. Rotate the wheel
assembly of the fixture to the zero azimuth setting. Lock the
assembly in this position. Verify that the mechanical axis of
the target projector collimator is aligned to the pivotal axis of
the wheel assembly of the fixture. The height of the collimator
shall be such that its optical axis is coincident to the axis of
the sleeve of the mounting bracket when the mount, with mounting
bracket and dioptometer affixed, is inserted in the Adapter,
11750709. With the Adapter, 11750709, mounted on the wheel
assembly, the Alignment Gage, 11750712, together with the
dioptometer, shall align the adapter so that its interfacing
(female) dovetail meets the requirement of 3.6a and 3.6b. The
alignment gage, with dioptometer, shall also be utilized to
establish the mounting dovetail surface of the mount parallel to
the optical axis of the collimator. Position the mount on the
azimuth adapter. Adjust and position the dioptometer and
mounting bracket on the mount as specified in 4.7.6. Orient the
mount as specified in 3.6.d through 3.6g. Verify that the
vertical and horizontal reticle lines of the dioptometer and
collimeter target lines are superimposed. Then ascertain that
the optical axis of the dioptometer is horizontal by rotating the
wheel assembly of the fixture to 1600 mils, then counter-rotating
the mount, by means of the azimuth knob, to return the
dioptometer vertical reticle line coincident to the collimator
20
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