Model dynamo drawings

[Dougie SwanParticipant @dougieswan43463]

Hi

I just got a set of castings for a model dynamo but it didn’t come with any drawings

It’s 3″ internal dia and about 5 inches long, 3 castings in total

I can’t find anything on line so wondered if the collective knowledge on the forum might be able to help

Thanks

Dougie unusual

[JasonBModerator @jasonb]

Post a picture of what you have. Easy option tends to be to find a suitable motor and rip the totating bits out of that then wind your own coils and make the bearings and brushes to suit. That is how the Alyn one is done using a Lucus starter motor.

Do you have any idea of it’s perantage as to whether it was a commercial kit or just a spare set soemone ran off. The like sof Stevens Model Dockyard used to sell castings as well as several other sources.

I think I have some more details of this one that could be scaled up if that is the style you have

 

[noel shelleyParticipant @noelshelley55608]

Very early editions of ME ( the first few volumes )had numerous designs for dynamos though may be not much help in this case they are interesting.  Noel.

[Dougie SwanParticipant @dougieswan43463]

Thanks for the replies

I will post some pictures tomorrow

Dougie

[Dave HalfordParticipant @davehalford22513]

Plenty of room inside for a 760 size motor.

[JasonBModerator @jasonb]

Or bigger. I think we need to see the castings first as if it were an enclose circular type a bit like the Stuart then you can just put the whole can and magnets in. If more like the one I showed above then you would most likely want to wind your own so the can and magnets don’t get used and you just use the smaller diameter rotating parts and would therefore have room to base it on a larger motor

[Dougie SwanParticipant @dougieswan43463]

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[Dougie SwanParticipant @dougieswan43463]

Hi

These are the castings for the dynamo

Sorry for the delay

Dougie

[Michael GilliganParticipant @michaelgilligan61133]

It looks suitably cavernous to accept any one of hundreds of electric motors, if ‘gender reassignment’ is your chosen path.

Actually scratch-building a Dynamo in that casing could be a very long job though

… Which path are you on ?

MichaelG.

[JasonBModerator @jasonb]

That is certainly a big one and I do not recognise it as a published design. Maybe a home casting scaled up from a commercial one like the P M Research Dynamo.

If it were me I would work out what the main casting can be bored out to and what the likely lengths are going to be and then track down a suitable permanent magnet motor. Cut the ends off the case and fit that inside the main casting. Then make up suitable bearings for each end and a set of brushes.

Much like I did in this thread just larger. I’ll take a photo later of another motor I have that is intended for a larger version

[Michael GilliganParticipant @michaelgilligan61133]

Have a look at this, for example:

https://www.ebay.co.uk/itm/395999842791

MichaelG.

[JasonBModerator @jasonb]

I’ve a feeling it will want soemthing with a can diameter of about 3″

[Michael GilliganParticipant @michaelgilligan61133]

It was just a  example … a portion of fresh air keeps the cost down 🙂

MichaelG.

[Dougie SwanParticipant @dougieswan43463]

I’ve got one of those motors and was thinking of trying it

I sometimes come across old pm dc motors from food mixers I condemn at work so might just hold fire for a bit while I do some research
<p style=”text-align: left;”>Dougie</p>

[JasonBModerator @jasonb]

This is the one I mentioned, it came out of a skip but originally drove a bolt on wheel chair power unit a bit like this.

Can is 70mm OD and would trim down to 60mm long which is th eextent of the magnets. You might need to extend the shaft at one end if there is not enough length to get a drive pully on.

 

 

 

 

 

 

[Michael GilliganParticipant @michaelgilligan61133]

This looks familiar!

https://www.ebay.co.uk/itm/267272665443

MichaelG.

[Roderick JenkinsParticipant @roderickjenkins93242]

Good find Michael.  Looks like it would be suitable for a scale (3″?) showman’s engine, which might be search clue.

Rod

[Dougie Swan]

On Dougie Swan Said:

I’ve got one of those motors and was thinking of trying it […]

In case it’s of interest … I found the rather impressive data-sheet for that little motor:

https://handsontec.com/dataspecs/motor_fan/XD3420-Motor.pdf

MichaelG.

[Dougie SwanParticipant @dougieswan43463]

I think that’s who I bought the castings from

Dougie

[ScrumpyParticipant @scrumpy]

A few years ago I built a thetford town showman’s engine I managed to get the two books that went with the drawings it showed in detail how to make the dynamo and exciter but as I was pushed for Tim I used a wind turbine that fitted into the casting that came from reeves

sadly I sold the engine and books

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