Hornby B12 motor update, discussion and investigation

Sections, 1 rolling road, 2, Inside the B12 what I have done, 3, The defective motor and what happened.
we should not have to do this! Models should be offered for sale only if they are fit for purpose, very clearly there is an issue with these motors, a responsible manufacture should be recalling all affected stock and replacing the motors in them before sending back out. They can’t be unaware of this issue,.
It really is buyer beware, yes we could send them back, but that just causes massive disappointment and stress and in the end we don’t have the model we wanted. If they are not fit for purpose, they should not be offered for sale, end of!

Additional observations with the faulty motor.
The motor bearings are completely free to move within the end caps, such that the bronze bearing can rotate in all directions very easily.
While running initially freely (71mA) the motor will suddenly falter and slow down and the current draw goes high, more noise is observed at the same time.
Flexing one of the shafts returns the motor to free running for a short time.
I smoothed off all the score marks on the commutator and re-polished it.
I also skimmed the top layer of the brushes noting the same black powdery deposit coming away.
I then reassembled and ran the motor for two hours.
On re-inspection the commutators was again scored although not as bad as originally and copper lines were noted in the brush faces.
The motor ran warm even at 71mA and became hot at +100mA

The video and text are my opinions based upon my personal findings.

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This video is my own opinions and does not require or seek to require anyone to take similar action

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