Vertical Drilling Motor, Type GE752, GEK±91584D
CAUTION: Zero settings of advance gauge | hub is nearly in engagement with the taper fit (not | |
in actual contact), snap it forcibly into place with a | ||
must not be disturbed until all readings on the | ||
quick push. It is important that the hot hub be in- | ||
hub are completed. | ||
stantly snapped into position before it has | ||
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| cooled; otherwise, it will freeze to the shaft and | |
Heat the hub in an oven until it has reached a uni- | cannot be adjusted further. | |
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form temperature (the desired number of de- | 6. Check the hot or shrunk±on position of the hub | |
grees above shaft temperature). For example, if | ||
on the shaft. The advance from cold to hot posi- | ||
shaft temperature is 25 C (77 F), heat hub to | ||
tion along the axis of the shaft must be held with- | ||
25 C (77 F) +171 C (339 F) = 196 C (385 | ||
in the limits indicated. Check the actual advance | ||
F). This procedure should provide an advance of | ||
with an indicator gauge, located in the same rela- | ||
approximately 0.085 in. | ||
tive position as used to measure the cold position | ||
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An accurate method must be provided for mea- | in Step 3, Fig. 41. | |
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suring hub and shaft temperatures quickly be- | If the advance is not within specified limits, re- | |
fore mounting the hub. This can best be done | ||
move the hub and repeat the assembly proce- | ||
with a hand pyrometer. In using the pyrometer, | ||
dure. | ||
place points of the gauge inside the bore of the | ||
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hub, Fig. 42. | TESTING AFTER OVERHAUL | |
NOTE: The part must be left in the oven long | TESTING SERIES MACHINES | |
enough for the heat to penetrate throughout the | (Models 5GE752AUP, AUT) | |
part. |
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Measure the temperature of the shaft and the hub with the same instrument.
5.Insure that the hub bore and the shaft taper are clean. Then, using adequate hand protection, quickly mount the hot hub on the shaft in the same angular position as when cold. When the
FIG. 41. METHOD OF USING ADVANCE
GAUGE. E±5975A.
After the motor has been reconditioned and reas- sembled, make the following tests to assure it will oper- ate satisfactorily.
Connect the motor to a d±c arc±welding generator, Fig. 7. Refer to connection diagrams, Figs. 22 and 24, for connections. Run the machine series±connected without load at 900 rpm and measure bearing tempera- tures.
1.Use Duxseal* putty to hold the thermometers on the drive end and commutator±end outer bear-
PLACE PYROMETER
POINTS IN BORE
OF HUB
FIG. 42. MEASURING TEMPERATURE OF
COUPLING HUB WITH PYROMETER. E±5976.
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