Motor Shorting

Includes workshop practice, painting and weathering, model photography etc.
Thornbush
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Joined: Fri Feb 12, 2016 4:38 pm

Re: Motor Shorting

Postby Thornbush » Tue Jun 09, 2020 12:15 pm

PS - close up photos show just how much cleaning and tidying up is needed before it goes the pawnshop!

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Tim V
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Re: Motor Shorting

Postby Tim V » Tue Jun 09, 2020 12:31 pm

Thornbush wrote:PS - close up photos show just how much cleaning and tidying up is needed before it goes the pawnshop!

I know you've had problems with it but pawning it won't help :shock:
Tim V
Scalefour News Editor

Thornbush
Posts: 12
Joined: Fri Feb 12, 2016 4:38 pm

Re: Motor Shorting

Postby Thornbush » Tue Jun 09, 2020 12:34 pm

Good grief, thank goodness spell check chose the right kind of pawn shop!

FCA
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Joined: Wed Jul 23, 2008 2:49 pm

Re: Motor Shorting

Postby FCA » Tue Jun 09, 2020 4:28 pm

Invest in a pack of Rizla fag papers and use them to insulate the inside of the splashers where the flanges short. Fix in place using a thin coat of varnish or superglue. You won't find anything that's much thinner.

Richard

Julian Roberts
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Re: Motor Shorting

Postby Julian Roberts » Wed Jun 10, 2020 3:47 pm

I had exactly the same problem on my Compound, intermittent shorts on curves. I did the fag paper and Araldite business but before I understood that :-

A loco can go perfectly well if the whole body is live to one rail - you won't know it is live. But as soon as anything touches from the other rail it stops running.

If the body is properly insulated then momentary touching on a curve, so that the body then becomes live to that rail, won't make any problem. Only if simultaneously the other side touched would there be a problem.

As soon as I insulated the motor from the body these intermittent shorts ceased.

A test was to gently run the loco with spinning wheels against a stop and place some brass wire on the loco and against one rail and then the other rail, and do the same with the tender. It should be possible to do this and not cause the wheels to stop.

However on your photo the motor connection points looked as though they're the small kind and unlikely to be a problem as mine were. But if the above test shows the body is live to one rail somewhere something must be touching.

I'm not making out I am an expert: many here really are experts. Just that was my experience, and I must say it did cause me to shelve the loco for some time as I thought maybe I'd made it too complicated, while now I'm pleased to have the extra pick up from the tender (I actually have two wheels pick up on tender, two on bogie, and all 4 driving wheels. The bogie frame is live so its connection to the loco relies on the strength of Araldite!)

Edited out some ambiguity of 1st sentence last paragraph

Thornbush
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Joined: Fri Feb 12, 2016 4:38 pm

Re: Motor Shorting

Postby Thornbush » Fri Jun 12, 2020 12:11 pm

The Rizla paper trick seems to have worked and now it is running ok; no faltering, no arcing, no dead spots.

For those interested, a couple of photos are attached before taking off all the bright brass and NS parts and dismantling for painting. Perhaps I should move this to another topic area but I don't know how, so apologies for going off-subject.
Attachments
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David Thorpe
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Re: Motor Shorting

Postby David Thorpe » Fri Jun 12, 2020 12:53 pm

There are times when it seems a real shame to have to paint a loco because it looks so good as it is. This is one of them.

DT

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Paul Willis
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Re: Motor Shorting

Postby Paul Willis » Fri Jun 12, 2020 8:38 pm

Thornbush wrote:For those interested, a couple of photos are attached before taking off all the bright brass and NS parts and dismantling for painting. Perhaps I should move this to another topic area but I don't know how, so apologies for going off-subject.


Where and how would you like the topic moved?

The Moderators of the Forum can do such things. Or you could just start a new topic and repost the material you want to commence with.

Cheers
Paul Willis
Deputy Chairman
Beware of Trains - occasional modelling in progress!
www.5522models.co.uk


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