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Presented by Ken Johnson -

Carbon Brushes School

Specialist Training for DC Motor Maintenance Engineers & Repairers

Trouble Shooting Carbon Brushes

by Ken Johnson

The Knowledge you will gain from this Course:

  • The importance of pole air gap
  • The Methods of settings the neutral position of brush gear
  • How to recognise brush grade families and select the correct grade for your application
  • What happens when brush grades are mixed
  • The importance of surface film on commutators
  • The affects of humidity on brush life
  • How to calculate brush current density and its importance to good commutation
  • How to manage brush current density
  • The correct selection— Fitting and Order of Pole Shims
  • How to analyse and trouble shoot sparking problems
  • The rights and wrongs of Commutator undercutting
  • How to assess the ware repair indicators of Commutators
  • How to analyse the ware characteristics of Carbon, Brushes, Boxes and Springs
  • How much Spring Pressure to apply for different types of DC motors
  • Is there any such thing as a Constant Torque Spring?
  • The affects of external contaminants on commutation
  • How to set the correct angle and position of brush holders

All delivered in a no nonsense easy to follow and very clear style with good ‘take home’ information.

Register for the 1st of September of 2017

For more information download the full brochure!


Course trainer - Ken Johnson

Ken Johnson began his professional career as an air traffic controller.
After 4 years, he found that carbon brushes with their many idiosyncrasies
were far more challenging than landing aircraft. Having always been
intrigued with machines, he discovered brush-ology 31 years ago and has
worked with them ever since.

Training - 19/09/2017


£395 GBP (EASA Members)
£580 GBP (Non-members)


193 Camp Hill, Birmingham,
United Kingdom B12 0JJ

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