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Tarting up a Microcosm dynamo
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jim_easterbrook


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PostPosted: Fri Jul 28, 2017 10:03 am    Post subject: Tarting up a Microcosm dynamo Reply with quote

A few months ago I bought one of Jin's FD4 dynamos. As you can see, it's a small electric motor in a rather nice bracket (apart from the screw in the top). The circuit board on the back of the motor doesn't help the appearance though.
Microcosm FD4 dynamo

I decided to bury the board in Milliput epoxy putty. I used a bit of 32mm (nominal size) waste water pipe to make a mould - the pipe is a snug fit over the motor body - and a bit of 3mm silicone pipe to cover the protruding shaft.
Microcosm FD4 dynamo

After the putty had set I removed the mould and then filed and sanded the putty to an even finish.
Microcosm FD4 dynamo
Microcosm FD4 dynamo

Next job is to paint the whole thing with Humbrol Brunswick green enamel. I also have a " 20tpi grub screw to replace the bolt in the top. It would be nice to have a lifting eye there, but this camera tripod thumb screw doesn't really pass in my opinion.
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MrDuck


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PostPosted: Fri Jul 28, 2017 10:17 am    Post subject: Reply with quote

I think that is good. I prefer covered electronics as well
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MrMamod


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PostPosted: Fri Jul 28, 2017 12:02 pm    Post subject: Reply with quote

Looks great BUT If it were me I would look for a nice Brass hook/eye bolt that would screw in there as that would look more like the Stuart Ones.

Like the one in this link  


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jim_easterbrook


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PostPosted: Fri Jul 28, 2017 12:16 pm    Post subject: Reply with quote

MrMamod wrote:
Looks great BUT If it were me I would look for a nice Brass hook/eye bolt that would screw in there as that would look more like the Stuart Ones.

Don't think I haven't looked! Needs to be the right thread though.
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Roly Williams


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PostPosted: Fri Jul 28, 2017 12:26 pm    Post subject: Reply with quote

How about this one: http://www.ebay.co.uk/itm/Ttc-Lif...item1ebb3df7fd:g:ka0AAOSw44BYGUsm
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jim_easterbrook


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PostPosted: Fri Jul 28, 2017 12:44 pm    Post subject: Reply with quote

Roly Williams wrote:
How about this one: http://www.ebay.co.uk/itm/Ttc-Lif...item1ebb3df7fd:g:ka0AAOSw44BYGUsm

That's one I had found. Scaling from the photo (naughty!) the eye appears to be over one inch diameter and would look a bit odd on top of a 3 inch long dynamo.
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Roly Williams


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PostPosted: Fri Jul 28, 2017 1:29 pm    Post subject: Reply with quote

I see what you mean. How about something like this: http://www.ebay.co.uk/itm/All-Siz...eba9864:m:mWVGb4UxBhCD8vyNXLjfANg, screwed into a plastic stud?
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jim_easterbrook


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PostPosted: Fri Jul 28, 2017 1:33 pm    Post subject: Reply with quote

Roly Williams wrote:
I see what you mean. How about something like this: http://www.ebay.co.uk/itm/All-Siz...eba9864:m:mWVGb4UxBhCD8vyNXLjfANg, screwed into a plastic stud?

That's a possibility. I may just try filing down the head of a suitable screw though, or making a ring from copper or brass wire and silver soldering it to a stud. For the time being I'll proceed without an eye bolt, just using a grub screw.

PS Thanks for the helpful suggestions Roly.
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jim_easterbrook


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PostPosted: Fri Jul 28, 2017 3:36 pm    Post subject: Reply with quote

I've found this now: http://www.ebay.co.uk/itm/Shoulde...M5-M6-M8-M10-M12-M16/322378608652 The smallest is M3, but it's not clear what the eye diameter is. I've taken a punt and ordered one. I should be able to plug the existing " hole with Milliput and then drill and tap 3mm.
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MrMamod


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PostPosted: Fri Jul 28, 2017 4:44 pm    Post subject: Reply with quote

jim_easterbrook wrote:
I've found this now: http://www.ebay.co.uk/itm/Shoulde...M5-M6-M8-M10-M12-M16/322378608652 The smallest is M3, but it's not clear what the eye diameter is. I've taken a punt and ordered one. I should be able to plug the existing " hole with Milliput and then drill and tap 3mm.



Now that's what I was thinking off  Thumbs up!
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Roly Williams


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PostPosted: Fri Jul 28, 2017 6:50 pm    Post subject: Reply with quote

That should do.
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Wallace


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PostPosted: Sat Jul 29, 2017 9:31 am    Post subject: Reply with quote

MrMamod wrote:
Looks great BUT If it were me I would look for a nice Brass hook/eye bolt that would screw in there as that would look more like the Stuart Ones.

Like the one in this link



Always wondered why the hook/eye bolt is used for on these.
Any reasons for them?
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The Denying Dutchman


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PostPosted: Sat Jul 29, 2017 9:41 am    Post subject: Reply with quote

Wallace wrote:


Always wondered why the hook/eye bolt is used for on these.
Any reasons for them?


It makes it easy and save to move them with a pulley. Not much to hold on to without an eye mounted on them.
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Wallace


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PostPosted: Sat Jul 29, 2017 9:48 am    Post subject: Reply with quote

The Denying Dutchman wrote:
Wallace wrote:


Always wondered why the hook/eye bolt is used for on these.
Any reasons for them?


It makes it easy and save to move them with a pulley. Not much to hold on to without an eye mounted on them.


Thanks paul, so it's more a replication of a full size genny as opposed to being of use on a model dynamo
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jim_easterbrook


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PostPosted: Sat Jul 29, 2017 10:23 am    Post subject: Reply with quote

If I can't find/make a suitable looking eye I'll just plug the hole and leave the top surface flush. It is just an appearance thing.
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