How is seating of new brushes on a DC motor...

Question 1 / 2707066636eed28f7522a1c51da2d

Question 1 of 2707066636eed28f7522a1c51da2d

How is seating of new brushes on a DC motor commutator accomplished?

Question 1 of 27070

How is seating of new brushes on a DC motor commutator accomplished?

🔍 Key Concepts

• Purpose of seating brushes on a DC motor commutator (contact area, sparking, heating) • Effect of abrasive materials (emery, sandpaper, lapping compound) on copper commutators and the magnetic circuit • Why the machine should be de-energized during mechanical seating work

💭 Think About

• Which materials in the choices can leave conductive or magnetic particles that might damage the commutator or cause short circuits? • Which method gives a smooth, well-matched curvature between brush and commutator without cutting too aggressively? • In practice, how is the brush usually pressed against the commutator while the abrasive shapes the face?

✅ Before You Answer

• Check which abrasives are non-conductive and non-magnetic, suitable for copper commutators • Eliminate options that use files or coarse cutting tools that could groove or damage the commutator surface • Confirm that the correct method is done on a de-energized machine, with the brush held in its normal operating position

Question 1 of 27070

How is seating of new brushes on a DC motor commutator accomplished?

emery paper for the initial cut and crocus cloth for the finishing cut

a file for cutting the approximate curvature followed by sandpaper for the final fit

course lapping compound, followed by a medium and then a fine grade

using fine sandpaper on a de-energized machine between the brush and the commutator to establish the proper curvature

Question 1 / 2707066636eed28f7522a1c51da2d

Question 1 of 2707066636eed28f7522a1c51da2d

How is seating of new brushes on a DC motor commutator accomplished?

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Question 1 of 27070

How is seating of new brushes on a DC motor commutator accomplished?