Dismantling English Electric 1/2 hp motor

[Mike CrossfieldParticipant @mikecrossfield92481]

[Mike CrossfieldParticipant @mikecrossfield92481]

I am trying to dismantle an old English Electric resilient mount 3 phase 1/2 hp motor which was fitted to a Myford 7 lathe. The motor was making some odd rumbling noises despite spinning freely. However there was 1/8 inch end play in the shaft. After removing the 4 through bolts the end cover which the output shaft comes through came off without difficulty. The plain white metal bearing was in good condition. However, I cannot remove the rotor because despite rotating freely the shaft seems to stuck in the blind end cover. I have applied moderate force, but apart from the 1/8 inch movement mentioned earlier the shaft will not withdraw from the end cover.

Before resorting to greater force I am asking if anyone has had a similar problem, or knows of any retaining device I’ve overlooked.

TIA

Mike

[john fletcher 1Participant @johnfletcher1]

Hello Mike, can't you take the NON drive end end shield off the motor complete with the rotor. Usually a sharp rap with a hide faced mallet and motors drops to pieces. Its a good idea to mark across end shields to stator with a scriber prior to dismantling, then look for the marks when re assembling the motor, the mark ensure correct and free running. Slowly tighten opposite bolts as you go, once you have got the scribe marks lined up, keep giving the rotor a twist by the hand.By the way a bit of end float is quite normal for motors fitted with bushes. John

[EmgeeParticipant @emgee]

Mike, do as John suggests but also check that the wavy washer is present, that restricts shaft end float but compresses to take up any shaft expansion.

Emgee

[Robert DoddsParticipant @robertdodds43397]

Mike,
Does the non drive shaft end have any sort of endcap covering the shaft end? Behind the end cap it is not unusual to find a circlip or similar device fitted on the shaft and hence retaining it in the motor end plate. You should also check where wire entry is because you could create other problems if you withdraw rotor and end plate as one and then find the wire connection plate is part of the end plate assembly.
A photo of your specific motor might help.
Regards Bob D

[Mike CrossfieldParticipant @mikecrossfield92481]

Thanks for the replies. Not easy to remove the non drive end cover complete with rotor because the terminal plate and all the associated wiring is attached (as Robert suggested). There is a pressed tinplate cover over the end of the shaft, so I’ll try to remove it and see if Robert is right about a retaining circlip.

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