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TM 55-4920-425-13&P
CHAPTER 2
OPERATING INSTRUCTIONS
2-1. Controls And Indicators. All controls and indicators are located on the front of the unit (refer to figure 2-1). They
consist of the POWER ON/OFF switch and indicator, which controls power to all systems. The DEG/SEC switch which
turns off the drive motor in the OFF position and selects speeds of 10, 15, and 20 degrees per second. The clutch
switch, when in the ON position, energizes the drive clutch in the on position. An indicator is provided to tell when power
is applied to the clutch. Rotation direction (CW or CCW) is controlled by the ROTATION switch. A center off position on
the ROTATION switch allows the drive motor to stop before reversing direction to prevent heating. The VIBRATOR
switch controls the vibrator motor only. An indicator is provided to tell when power is applied to the vibrator.
2-2. Connectors. Connectors are located on the rear of the base, the rear panel of the cradle, and on the rim of the
table (refer to fig 2-2). They consists of the power cord on the right rear of the base and the motor power and control
cable connector on the left rear of the base, as viewed from the front. Near the lower left hand corner of the rear cradle
panel is the termination connector for the motor and control cable. At the lower center of this panel is the pneumatic
input connector for instrument pressure. This is a 3/8 NPT size pipe fitting. Near left center of the rear cradle panel is a
series of four connectors to provide input power for test instruments. On the table rim is the termination of the pneumatic
supply, which is 3/8 NPT pipe size, as well as four electrical connectors, which are connected through slip rings to the
corresponding connectors on the cradle rear panel.
2-3. Operating Instructions.
a. With the table sitting on a firm and relatively flat surface, lock cradle and gimbal ring in the vertical position.
b. By means of the four leveling screws in the cast base, adjust table to a level condition as indicated by the circular
bubble level mounted on the top of the gimbal ring.
c. To check horizontal level, pull the cradle lock pin out and move cradle to the horizontal position and relock (refer
to fig 2-3). With table turned so that zero position is in alignment with index pointer, bubble level on gimbal support plate
next to locking knob should show approximate zero.  No adjustment is required in this position, unless a refining
adjustment between vertical and horizontal is desired.
d. Move cradle back to vertical and lock.
e. Plug power cord into a grounded 117V, 60 Hz power outlet.
f.  With cradle and gimbal ring set in desired position, set DEG/SEC switch to desired speed.
g. Select direction of rotation with the ROTATION selector switch to either CW or CCW.
h. Turn on vibrator motor if desired for test being performed.
i. Turn ON POWER switch and table will commence operating in modes previously selected. NOTE: Speeds,
clutch, direction of rotation and vibrator motor may all be changed while table is in operation if desired.
j. There are four "MS", "AN" connectors on back of the cradle carriage with matching connectors on table rim.
Supply power for any particular type instrument may be fed through the connectors on back cradle, through an internal
precision slip ring assembly to the matching "MS", "AN" connectors on the rim of the table. Short feed cable may then be
connected from the table connectors to the instrument under test, so that continuous rotation in either direction may be
obtained. There is also a 3/8 inch pipe fitting located at the bottom center of the cradle through which vacum or pressure
may be transmitted to the rim of the table, through the hollow shaft, to allow hook-up of any type of gyro which is air
driven.
WARNING
Turn main power switch off when setting either the cradle or gimbal ring from one 90position to
the other. When equipment is operating and the clutch is turned "OFF", table may or may not drift
due to frictional forces through gears, clutch, and drive belts. This is normal and table may be
moved freely as no power is applied to drive.
2-1

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