(i)
Plot the first reading (amount and angle) and identify it as Point No. 1 (see
Figure 406).
(j)
Plot the second reading (amount and angle) and identify as Point No. 2.
(k)
Draw a line between Points No. 1 and 2. Divide the line into two equal lengths and identify center of line as Point X.
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Vector Calculation (Polar Graph Plotting) (Typical)
Figure 406
Repair
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(l)
Measure distance between Point No. 2 and Point X. Convert to scale selected. Amount measured is the total unbalance of part.
NOTE: Lead tape or clay may be used to gimmick (balance) arbor or tool. Add lead tape or clay 180 degrees from angle of Point X.
(m)
Measure distance between zero amount (center of polar chart) and Point X. Convert to scale selected. Amount measured is the total unbalance in the arbor or tool.
(n)
Using compass, draw a tolerance circle with its center at Point X. The radius of this circle shall be the scale-equal of the balance limit specified in applicable manual for unit in work.
(o)
Draw a line from center of polar chart, parallel to the line of Point No. 1 to Point No. 2, and in the direction of Point No. 2. Note angle of this line. Stock removal shall be accomplished at this angle. If addition of stock is required add 180 degrees to angle.
(p)
Locate correction angle accurately on part. Remove part from balancing machine.
CAUTION: REMOVE STOCK ONLY FROM AREAS OF PART AS SPECIFIED IN APPLICABLE MANUAL FOR PART IN WORK.
(q)
Cover arbor or tool attached to part to protect from metal particles, and remove or add stock at Plane L correction angle (Figure 406). Minimize stock removal or addition by concentrating at correction angle.
(r)
Thoroughly remove metal particles and reinstall part in balancing machine.
(s)
Spin part and record corrected angle and amount. Plot corrected reading (amount and angle) and identify as Point No. 3.
(t)
If Point No. 3 falls within tolerance circle the part is balanced within limits. The distance between Point X and Point No. 3 is the remaining unbalance in the part.
(u)
If Point No. 3 falls outside of tolerance circle draw a line from center of polar chart parallel to the line of Point X to Point No. 3 and in the direction of Point No. 3. Second balancing attempt shall be made at this correction angle.
(v)
Repeat Steps (q) through (u) as required until part is balanced. Remove part from balancing machine.
(w)
Plane M may be plotted on same chart as depicted in Figure 406.
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13. Repairing Electrical Components
NOTE: The following methods are typical only. Refer to applicable manual for unit in work for specific instructions.
A. Method No. 413A: Switch Assembly Repair
Repair switch assembly as follows:
NOTE: Upon completion of repair, switch shall be within measurement of Dimension F, Figure 407, as specified in applicable manual. If sleeving requires replacement, potting compound may have to be removed from both parts of assembly.
(1)
Remove potting compound from part to be replaced. Melt solder from connecting points on part and separate wiring from part.
(2)
If required, remove sleeving from wiring.
(3)
Cut new sleeving to length specified in applicable manual. Slide new sleeving over wiring.
(4)
Connect wiring as shown in wiring diagram on Figure 407.
NOTE: Ensure proper alignment of receptacle prior to installation of wiring.
(5)
Solder wiring in place in accordance with AMS4756, using solder conforming to ANSI J-STDs 004, 005, or 006, and flux conforming to ANSI J-STDs 004, 005, or 006.
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