Discussion
Threading or grooving of a commutator surface is caused by
Answer: B
Correct answer: abrasive contamination or an unsuitable brush grade
Grooves cut into the copper mean something abrasive is passing between brush and commutator: dust drawn in with the cooling air, or a brush grade harder than the application calls for. The remedy is to clean the air and to change the grade, since resurfacing without doing so simply repeats the damage.
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