Staining or Burning of Commutator
1.
Check to see if the commutator surface
is
stained or burnt.
2.
If
it
is
locally burnt, correct with fine sandpaper.
Checking Mica (Undercut)
1.
Check to see if the mica has sunk below the allowable limit.
2.
If
it
is
below the allowable limit, correct with a saw blade. Since the correction produces burrs
on
the corner of the segment, chamfering should
be
executed.
Reference value
Allowable limit
0.50
to
0.80
mm
0.0197
to
0.0315
in.
Less than 0.20 mm
(0.0079
mm in.)
1.
Bad
2. Good
3.
Mica
4.
Segment
5.
Depth of Mica
162
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