remagnetiser

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remagnetiser

This topic has 6 replies, 3 voices, and was last updated 3 November 2022 at 10:29 by John Haine.

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2 November 2022 at 08:27 #619418
ian weeks 1
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@ianweeks1
Dear All,

I have decided to try and build a remagnetiser for some old hornby dublo locos I have as well asa Bing alternator I am restoring. One project leads to another! Rather than re invent the wheel I have been reading as much as I can. I have seen reference to an article in ME in the early nineties (vol 177, 3942). I have taken ME since the mid 80's and they are all stored in the loft. Unfortunately I cannot get at them due to the fact my son has crammed it while he has a house extension!!!

If any kind soul could scan it for me I would be most grateful and happy to make a donation to a charity of choice. Also If anyone knows of a more modern take I should like to know .

Thank you Ian
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2 November 2022 at 08:27 #32295
ian weeks 1
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@ianweeks1
2 November 2022 at 10:07 #619435
Circlip
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@circlip
Send your e-mail address via PM.

Regards Ian.
2 November 2022 at 12:49 #619450
John Haine
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@johnhaine32865
If you find the Magnetexpert website I think they have neodymium replacement magnets the right size to fit.
2 November 2022 at 13:42 #619454
John Haine
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@johnhaine32865
Here you go…

**LINK**
3 November 2022 at 09:18 #619567
ian weeks 1
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@ianweeks1
Thank you ,gentlemen for your help. Especially "circlip 'for the article. I am now in the position having sourced bits and pieces from the workshop and internet to start . I could go down either ME article road, (12v) or capacitor path using circuit from internet. I think will be 1st option but the fly in the ointment is obtaining 2 suitable "bobbins" / coil formers. The ME article uses sheet tufnol (easy) and tube tufnol ( hard to source except in industrial lengths/ prices).

I have some 40mm and slightly larger "nylonie" material, fell of a skip decades ago!

I could turn it down but not sure if suitable. I assume any non conductive material would suffice.

Anyway , if plan A fails can always use bobbins/ coil for a plan B .

Thanks again Ian
3 November 2022 at 10:29 #619581
John Haine
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@johnhaine32865
Yes, anything non conductive and sufficiently strong. Paxolin, pcb material with no copper, thin ply. I made a demag bobbin out of a bit of plastic drainpipe and a couple of thin ply cheeks araldited together. Even papier-mache if it's dried thoroughly and impregnated with a resin – https://www.ronseal.com/products/high-performance-wet-rot-wood-hardener/ works well, very thin, soaks in and dries rock hard. Or use that with a stiff card.

I still think that replacing with modern magnets would be better, much stronger and resistant to demagnetisation.
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