* Abrasiveness: Emery cloth is very abrasive. While it might remove some surface imperfections, it can also damage the commutator by removing too much material, creating uneven surfaces, and ultimately shortening the lifespan of the motor.
* Conductivity: Emery cloth can leave behind abrasive particles on the commutator surface. These particles can interfere with the electrical conductivity, causing sparking, overheating, and even motor failure.
* Fine Polishing: Emery cloth isn't designed for the fine polishing required on a commutator. It can leave deep scratches and grooves that will actually worsen the problem you're trying to fix.
Instead of emery cloth, you should use:
* Fine-grit sandpaper (600-800 grit): This is a more appropriate abrasive for removing minor imperfections.
* Commutator stone: These are specifically designed for polishing commutators and are less abrasive than emery cloth.
* Sandpaper with a lubricant: This helps reduce friction and heat generation, preventing damage to the commutator.
Remember:
* Always use a light touch when polishing a commutator.
* Be sure to clean the commutator thoroughly after polishing to remove any abrasive particles.
* If you're unsure how to polish a commutator, consult a qualified electrician or motor repair technician.
By using the right tools and techniques, you can ensure your commutator is properly maintained and your motor runs smoothly for years to come.