| As the C3 milling spindle has no commutators, carbon brushes or ventilation parts, no further maintenance is required. |
| It may also increase efficiency of machines as there won't be frictional effects of brushes, commutators, etc, on the motor itself. |
| Each year during the summer, the DC machines are shut down for an overhaul: servicing includes changing the carbon brushes and skimming the commutators, among other things. |
| Copper is also used for manufacturing commutators, welding electrodes, contacts, contact springs, high vacuum and other electronic devices. |
| Direct current is produced by batteries, fuel cells, rectifiers, and generators with commutators. |
| The selection is rounded out by copper sections for starter commutators and for other auxiliary motors. |
