True or False: Use emery paper to seat brushes.

True or False: Use emery paper to seat brushes.

• A. True
• B. False
• C. Not specified
• D. Sometimes

Answer: (B)

Seating brushes means forming the brush face to the exact contour of the commutator so it makes even, full-face contact as the machine runs. Emery paper is not appropriate for this task because its grit can shed into the bearing/commutator interface, scoring the commutator or embedding particles in the brush. That can cause uneven wear, excessive sparking, and early failure. The proper approach is to seat the brushes by running the machine under light load so the brushes wear in to the commutator, ensuring the entire face contacts evenly, or to use manufacturer-approved methods (like a fine, controlled lapping or dressing method) rather than emery paper.

Seating brushes means forming the brush face to the exact contour of the commutator so it makes even, full-face contact as the machine runs. Emery paper is not appropriate for this task because its grit can shed into the bearing/commutator interface, scoring the commutator or embedding particles in the brush. That can cause uneven wear, excessive sparking, and early failure. The proper approach is to seat the brushes by running the machine under light load so the brushes wear in to the commutator, ensuring the entire face contacts evenly, or to use manufacturer-approved methods (like a fine, controlled lapping or dressing method) rather than emery paper.