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|  MIL-H-63192 (AR)
to accomplish traversing shall not exceed 115 inch-pounds at the
handwheel shaft.
The maximum backlash of the traversing handwheel
shall not exceed 20 degrees rotation in either direction.
3.3.8 Elevating mechanism.-The elevating mechanism shall be
capable of elevating and depressing the cannon tube from a
poisition of minus 85 mils to positive 1333 mils.
The torque
required to elevate or depress at any point throughout the
operating range shall not exceed 200 inch-pounds at the hand-
wheel shaft.
The maximum backlash of the elevating handwheel
shall not exceed 20 degrees of rotation at any position in
either direction of elevation or depression.
3.3.9
Fire
Control.
3.3.9.1 Gun elevation - plumb travel.-The elevating
trunnions of the carriage shall be cross leveled by having the
cannon track a plumb line within 0.1 mil through a-range of
O to 978 mils elevation minimum.
The fire control instruments
shall meet the requirements of 3.3.9.2 through 3.3.9.7.
Testing
shall be as specified in 4.6.9.2.
3.3.9.2 All knobs on the fire control instruments shall
function properly without binding, looseness or excessive torque.
All counters shall operate properly and all radioactive sources
shall be illuminated, including those on the off-carriage
equipment.
3.3.9.3 Alignment of mount M171, panoramic telescope M137
and quadrant M17.
The quadrant elevation level vial shall be adjusted, as
a.
necessary, to center the bubble when the cannon tube is at zero
elevation and the elevation counter is set at 0000.
After boresighting on the target and setting the azimuth
b.
counter to 3200 mils, the panoramic telescope shall align on the
alignment device at 4800 mils within + 0.5 mil.
Elevate the cannon tube from O to 1275 mils in 200 mil
c.
steps.
Relevel the M171 in pitch and cross-level for each 200
mil step.
The verticle reticle line of the telescope shall not
deviate from the test target verticle line by more than + 0.6
mil from O to 899 mils elevation and not more than + 1.5 mils
from 900 to 1275 mils elevation.
3.3.9.4 Alignment of mount M172 and quadrant M18.
a.
The elevation pads on the mount shall be parallel with
the cannon tube within + 0.2 mil.
7
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