CAMTECH/97/E/TM/3.0
TM Maintenance Handbook January’97
25
■
In case that stepped wear is
cased in Commutator surface
(when `
δ
w’ exceeds 0.1-mm max.)
shown in figure 2.7)
■
In case where it is impossible to
rework by a grindstone because
the commutator surface is heavily
rough
■
When reusing the traction motor
after a long-term storage (more
than 6 months), oxide film is pro-
duced on the Commutator surface
causes poor commutations.
■
The degree of turning of Commutator surface should be judged according
to the conditions of commuter surface, and it must be cut at minimum re-
quired limit.
2.7.8.3 Mica under Cutting and Chamfering
When the commutator surface is cut the slot between the Commutator bars
shallows and chamfering of Commutator bars, too, become small. Therefore af-
ter cutting, under cutting chamfering should be performed with suitable tool.
Details of under cutting & chamfering are shown below in figure 2.8 and 2.9.
2.7.8.4
Lathing
Figure 2.7
Figure 2.8
Figure 2.9
