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SPECIAL TOOLS AND TEST EQUIPMENT
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Part Number
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Nomenclature
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Application
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| QB71520-1
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V.T.V.M. cable |
To connect vacuum tube voltmeter to
omni-directional
instrument tester 13703-1-A.
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QB72217-2
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Bearing
test rotor
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Used
with bearing torque tester
13716-1-A to test
ball bearings.
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| QB72218-1
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Calibrator
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To set up and check bearing torque tester 13716-1-A
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| QB74218-I
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Synchro adjusting wrench
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To remove cap and adjust end play of Eclipse-Pioneer
synchro. |
| 13638-1-B
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Bearing cleaner
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To clean and thoroughly dry ball bearings and small
parts. Bearing cleaning solution QB14634-1
required
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| 13693-1-A
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Hermetic sealing stand
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To seal, evacuate, fill, and leak-test instrument.
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| 13700-1-A
or equal
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Insulation tester
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To test insulation for breakdown
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| 13703-1-A |
Omni-directional instru-
ment tester
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To test indicator.
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| 13716-1-A
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Bear ing torque tester
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To test ball bearings for starting torque and friction.
Used with bearing test rotor QB72217-2.
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| 58534
Cat. No.
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Spanner wrench
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Adjust end play of Oster synchro.
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3-1. GENERAL.
3-2. Except where pressure
and temperature are directly specified, tests should be conducted
at atmospheric pressure
(approximately 29.92 in. Hg)
and room temperature (approximately
25° C (77° F)). When
tests are made with a
substantially different atmospheric
pressure or room temperature,
allow- ance must
be made for that difference.
3-3. TESTING BALL
BEARINGS. a.
Place the ball bearing
on a suitable mandrel
selected from bearing
cleaning tool kit QB70606-1.
set the ball bearing
spinning slowly. Smoothness of
bearing action can be
felt by the fingers holding
the mandrel; rotation
should be so smooth that
no vibra- tion
or roughness is apparent.
Should the retainer slow down abruptly, stop
suddenly, or reverse direc-
tion slightly, the ball
bearing must be rewashed,
relubricated, and retested
with the mandrel. If
the bearing fails
the second test, discard
it. b. Connect
bearing torque tester 13716-1-A
to the air
supply outlet of bearing
cleaner 13638-1-B with ¼-inch aluminum or copper
tubing. Level the bearing torque tester. Adjust the external air
pres- sure regulator
of the bearing cleaner
to givea pointer deflection on tile bearing
torque tester of about
“7”. Set calibrator
QB72218-1 on the bearing
torque tester against
the guide. With
air supplied to the bearing
torque tester, adjust the air pressure
knob at the right
side of the tester until
the dial on the calibrator
reads the required starting
torque of 1400 milligram-
millimeters. Adjust
the pilot lamp knob at
the left side
of the torque tester
until the tester pilot
lamp lights when the
calibrator reads the required starting
torque. The pilot lamp
must light at exactly
this starting torque,
not at a lower or
higher value. It may be necessary to
readjust the knob at
the right side
of the tester since the
adjustment of the pilot
lamp knob slightly changes
the pressure of the air
and, therefore the calibrator
reading. After the knobs are correctly set,
lock the pilot lamp knob
with the lock nut.
Turn the air pressure
knob to reduce
the air pressure to a
small value. Remove the calibrator from the
tester. c. With
tweezers, mount the ball
bearing on the mandrel of bearing test
rotor QB72217-2. Set the
rotor over the ball
bearing. Position the rotor
against the test guide
of the bearing torque
tester. Slowly turn
the air pressure knob
at the right side of
the bearing torque tester
to increase the air pressure.
The rotor must rotate
at least 360 degrees
before the red
pilot lamp lights. Repeat
the test for the opposite direction of test
rotor rotation. This is
done by turning the
jet of the bearing torque
tester SectIon
III Paragraphs
3-1 to 3-6 180
degrees. Make five
or six starts in each direc- tion of rotation. If the test
rotor does not rotate for each start, the bear
ing should be removed
from the rotor,
recleaned, relubricated, and retested.
If the bearing
falls the tests a second
time, discard it. d. Immediately install each
ball bearing that tests
satisfactorily, or
store In a clean, dry,
covered container.
Cover a bearing that
is stored with the
same oil (Specification
MIL-L-6085) with which it
is lubricated. 3-4. TESTING SYNCHROS. 3-5.
INSULATION BREAKDOWN TEST. With
insu- lation tester
13700-1-A, apply 550 volts
at 60 cps across
one stator lead and ground
(housing). No Insulation
breakdown should occur. Apply
the same voltage
across one rotor lead
and the housing. No
insulation breakdown should
occur, 3-6. SETTING
SYNCHRO ELECTRICAL ZERO. (See figure 3-1.) a. Place the partially
assembled Radio Magnetic Indicator in rack (3)
on top of the omnl-directional
instrument tester 13703-1-A,
Plug the ID250 tester
connector cable into
the Radio Magnetic Indicator.
b. Set main selector
switch (20) at “ID250
TEST SEL”. c. Connect the three
power sources (28-volt dc,
117-volt 80 cps, and
115-volt 400-cps) to the
instru- ment tester.
Set power switches (24)
at "ON". d.
Set the ID250 test, selector (5) switch
at “DIAL CARD".
e. Set standard transmitter
(6) at zero degrees.
f. Loosen the radio
magnetic indicator dial card
synchro clamps, and
carefully rotate the synchro
until the dial card
zero is at the large
pointer on the mask. Tighten the clamps
so the dial card aynchro
is secured in the
zero position. g.
Set ID250 test selector
switch (5) at “POINTER
NO. 1". Loosen
the front hand assembly
synchro clamps of
the Radio Magnetic Indicator.
Use the procedure
described in step f,
and set the front hand
assembly of the Radio
Magnetic Indicator on the
180 13
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