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Noise from Crompton Parkinson 3 phase 1/2 HP motor


This Crompton Parkinson motor came from a Myford ML7 and was stored in poor damp conditions. I have taken it apart and cleaned everything up, reassembled it after converting windings to Delta.
The motor was then left for a week in an electric oven at 70 centigrade, to make sure the windings were dry. Lubrication was dealt with and it rotated smoothly.On turning it on, I was rewarded with a very quiet motor. I then reversed it and there was a high speed knocking. which disappeared when .forward was selected.
The bearings are simple sleeve bearings and although not immaculate they should be good. I have seen and used sleeve bearing motors whose sleeves were more worn than this specimen and they were pretty silent. The rotor shafts were in reasonable condition, some light scoring but otherwise good. ....

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Short history of the 'most flexible of all' Type 3


Last year marked the 60th anniversary of the Birmingham Railway Carriage & Wagon Company’s Type 3, better known as the Class 33, or simply the ‘Crompton’. Mark Nicholls recounts the type’s history.
In British Railways’ 1955 Modernisation Plan there was little interest for a Type 3 power category, covering locos in the 1,500-2,000hp range, but that was soon found to be a mistake.
The Type 3 was actually one of the most flexible of all, able to provide a loco capable of varied mixed traffic use for light and medium freight and passenger work. It also had the ability to haul heavy loads at low to moderate speed. Furthermore, it offered the power of a Type 5 if used in multiple. ....

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