from the high temperatures generated by excessive
braking pressures. Wheels with this defect should
be removed and turned to restore original flange and
tread contour because the tread is irregular and out-
of-round due to the raised or built-up area.
2.11. ORIGINAL
CONTOUR
AND
WEAR
LIMIT
During the preceding discussions, several
references have been made to restoring treads and
flanges to original contour. As explained earlier,
any one-wear wheel is discarded when any of the
Figure 2.19. Circumferential Crack Through Rim.
Figure 2.20. Built-Up Tread.
wear limits is reached or when any defect is detected that is bad enough to condemn the wheel. However,
multiple-wear wheels can be turned or reclaimed as many times as is necessary until certain limits are reached.
Figure 2.21 is a diagram showing the tread and flange line when the wheel is new and the condemning limits of
wear.
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