O.  Copper picking in brush face
  Possible Causes Remedies
2 Vibration from external causes, i.e. forge hammer Remove causes - mount machine on shock absorbers
3 Vibration from internal causes, i.e. out of balance Balance armature and check for bearing wear
4 Interpole field too strong Reduce interpole fields
5 Interpole field too weak Increase interpole fields
6 Interpole air gap too small Enlarge air gap - decrease effective interpole flux
7 Interpole air gap too large Reduce air gap - increase effective interpole flux
8 Air gaps uneven (worn bearings) Replace bearings and realign machine
14 Mica proud Recess mica or use a more abrasive grade
16 Commutator too loose Tighten, use new mica and turn
18 Commutator or slipring excentric Turning and grinding at near rated speed
19 Flats on commutator or slipring Remove cause while turning or grinding
20 Spring pressure too low Adjust to brush grade
22 Spring pressure unequal Adjust spring pressure uniformly
27 Brush arc of contact insufficient Try with circumferential stagger or increase brush thickness
31 Brush sticking Check brush size - remove burns and dust
34 Brush holder mounted too far from commutator or slipring Adjust holder to be 2mm from commutator
41 Long periods at low or steady load Change brush grade - ask for our recommendation

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