K.  Copper Dragging
  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
5 Interpole field too weak Increase interpole fields
7 Interpole air gap too large Reduce air gap - increase effective interpole flux
20 Spring pressure too low Adjust to brush grade
21 Spring pressure too high 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
29 Radial brush holders not in correct position Adjust holder to radial position, distance from commutator 2-3mm
30 Reaction type holder mounted trailing Reverse holders or direction of rotation
41 Long periods at low or steady load Change brush grade - ask for our recommendation

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