Author Topic: Removing field windings from dynamo  (Read 1202 times)

Online Greybeard

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Removing field windings from dynamo
« on: 26.09. 2015 15:10 »
I'd like to get my dynamo case replated. Is it possible to remove and replace the field winding's without that special screwdriver tool?

Online bsa-bill

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Re: Removing field windings from dynamo
« Reply #1 on: 26.09. 2015 15:44 »
ouch - looks like a fair bit of torque required, enough that the screwdriver would ride out before the stud turned
Causal thought would be an air impact tool, but pictures appear in my mind of the field coil head butting the dynamo case,would require extreme care
All the best - Bill
1961 Flash - stock, reliable, steady, fantastic for shopping
1959 Rocket Gold Flash - blinged and tarted up  would have seizure if taken to  Tesco

Offline bikerbob

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Re: Removing field windings from dynamo
« Reply #2 on: 26.09. 2015 15:45 »
Some years ago I bought an overhaul kit for my A10 dynamo which included new field windings the screws are really tight but I have a set of screwdivers that have square shanks I made sure that the screwdriver was a good fit in the slots and putting pressure on the screwdriver I turned it using an adjustable spanner and they came loose OK.

Online Greybeard

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Re: Removing field windings from dynamo
« Reply #3 on: 26.09. 2015 16:01 »
What about an impact driver? Obviously I'd need to support the field coil armature to avoid distorting the dynamo case.

Online beezermacc

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Re: Removing field windings from dynamo
« Reply #4 on: 26.09. 2015 20:15 »
Don't use an impact driver as you'll end up with an oval body, then when you rebuild the dynamo the armature will catch on the pole shoe and body. I would recommend supporting the inside of the body with something rigid then drill the screws out. I have a jig I made for this job. If you want to send it or bring it I'll do it for you. I also have BZP plated bodies which I could do an exchange with if you want.
Priory Magnetos Ltd - A10 spares, magneto and dynamo refurbs. www.priorymagnetos.co.uk

Online Greybeard

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Re: Removing field windings from dynamo
« Reply #5 on: 26.09. 2015 21:56 »
I'll PM you Andrew

Online morris

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Re: Removing field windings from dynamo
« Reply #6 on: 26.09. 2015 23:13 »
A sawn of screwdriver bit with a nut welded on and stuck in a pillar drill works a treat.
Push the screwdriver bit in the slot and use a spanner on the nut to undo the screw.
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Online bsa-bill

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Re: Removing field windings from dynamo
« Reply #7 on: 27.09. 2015 08:34 »
I like that one Morris
All the best - Bill
1961 Flash - stock, reliable, steady, fantastic for shopping
1959 Rocket Gold Flash - blinged and tarted up  would have seizure if taken to  Tesco

Offline coater87

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Re: Removing field windings from dynamo
« Reply #8 on: 10.10. 2015 19:47 »
 I wish I lived across the big pond, this would be much easier (and a good deal less expensive if I did  *sad2*).

I think I will build my own version of the wheel driver and pole shoe expander. The cost alone of shipping go Andrew would be 100 of those funny pound things you use, possibly more.

 Does anyone know what type of playing the e3L had originally? Was it cadmium, nickle, maybe chrome?
Central Wisconsin in the U.S.

Online Greybeard

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Re: Removing field windings from dynamo
« Reply #9 on: 10.10. 2015 23:16 »
Zink l think. I did manage to zinc plate a few bits of my bike before I burnt out my battery charger but I'd rather get my dynamo casing professionally done.

Online trevinoz

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Re: Removing field windings from dynamo
« Reply #10 on: 11.10. 2015 21:14 »
Nickel plated until about 1951 when the nickel shortage occurred. I think that it was cadmium from then.
Zinc is an alternative as cadmium is out of favour.

Offline coater87

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Re: Removing field windings from dynamo
« Reply #11 on: 13.10. 2015 14:04 »
 This topic got me looking at mine a little more.

 It appears I have 2 pole shoe screws to deal with. The case says 10-57 which is correct, but I thought there should only be one?

 Or maybe I am just lucky, and got 2......  *conf*
Central Wisconsin in the U.S.

Offline u28909z

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Re: Removing field windings from dynamo
« Reply #12 on: 13.10. 2015 17:13 »
The earlier 'short' Lucas  E3H 40watt dynamo has one screw, the later E3L (long) 60watt dynamo has two.
Arthur

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Offline coater87

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Re: Removing field windings from dynamo
« Reply #13 on: 13.10. 2015 23:37 »
The earlier 'short' Lucas  E3H 40watt dynamo has one screw, the later E3L (long) 60watt dynamo has two.

 It's too bad I don't have an old bike instead of this modern 60w model.......
Central Wisconsin in the U.S.

Online beezermacc

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Re: Removing field windings from dynamo
« Reply #14 on: 14.10. 2015 07:26 »

[/quote]

 It's too bad I don't have an old bike instead of this modern 60w model.......
[/quote]

The E3L is a big improvement on the E3H.
Priory Magnetos Ltd - A10 spares, magneto and dynamo refurbs. www.priorymagnetos.co.uk