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Oxford Rail announces - OO gauge GWR Dean Goods


MGR Hooper!
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1 hour ago, chuffinghell said:


I don’t know about cordless motor my Oxford Rail Dean Goods has a motionless one :lol:

Really? You too? It's really disappointing, isn't it!

 

I managed to get one running today. It's the chassis and old motor of 2309 in the new (glossy) body of NRM 2516. The problem was that the decoder was dead - probably killed by the burnt out motor in 2475 when I was swapping things around. (Are you following this?)

Fitted a new Zimo decoder to 2516 and she's a runner -  a smooth runner even!

 

2309 with 2516's chassis only moves 5mm at a time.

 

2475 is standing on the scrap line, even with it's replacement motor. Shame because that one had sound and flickering firebox.

 

Edited by Harlequin
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On 15/07/2020 at 10:13, bigherb said:

That's the point, if it is coreless it is not effected by an AMR controller.

 

Works fine on my ECM controller too. Running the Hattons 5800 with coreless motor on the ECM make it sound like a bag of nails. Maybe the flywheel on the Dean is helping smooth it all out.

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On 14/07/2020 at 08:59, Harlequin said:

C. They can't pull the skin off a rice pudding - that's about traction more than motor power.

 

 

Check the centre wheels for wear (or rather, lack of...). I had several where the centre wheels did not touch the track. After running in, you could see wear marks on both pairs of outer wheels, but not on the centre pair. This affects grip and  current collection. The one I have now is better but still not perfect. Not got round to tweaking it yet, I kept it as it at least would run slowly, unlike the first two.

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Just had another go with one of my two

Will start 8 bogies, quiet, nice and smooth, but will not climb any sort of gradient even 4 was a struggle due to slipping so added some exterior weight on loco. will just about take 7 up the gradient but there is quite a bit more mechanical gear noise, put on 8 and it slows down too much.

 

Definitely needs a more powerful motor.

 

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1 hour ago, 57xx said:

 

Check the centre wheels for wear (or rather, lack of...). I had several where the centre wheels did not touch the track. After running in, you could see wear marks on both pairs of outer wheels, but not on the centre pair. This affects grip and  current collection. The one I have now is better but still not perfect. Not got round to tweaking it yet, I kept it as it at least would run slowly, unlike the first two.

 

Try slotting the centre axle bearings downwards, and adding springs bearing down on the axle.

 

John Isherwood.

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4 hours ago, 57xx said:

 

Works fine on my ECM controller too. Running the Hattons 5800 with coreless motor on the ECM make it sound like a bag of nails. Maybe the flywheel on the Dean is helping smooth it all out.

 

I'm no expert in electronics but isn't the BEMF an inherent characteristic of the motor, a natural consequence of the current flowing in the coils?

Motor turns and generates a BEMF; without a core - the motor generates far less feedback so to my mind that would be independent of any flywheel or load.

Edited by BWsTrains
typo
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The BEMF is generated by the inductance of the coils. A coreless motor has much less inductance than an iron cored one.

As I understand it, at low frequencies a coreless motor produces little BEMF and a low frequency BEMF controller can damage them by overcompensating for lack of BEMF. This can overheat the windings which cannot dissipate the heat generated.

With a higher frequency BEMF controller (say 20kHz) the BEMF is less affected and the motor runs fine.

 

DCC decoders are generally high frequency so no problems on DCC, but some DC controllers use LF BEMF, so can be a problem.

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 I had 3 fully laden macaws behind my remotored 2475 also 7 fully loaded coal trucks, 6 loaded ballast wagons, 2 lime stone wagons and a brake. It pulled them with ease. Although it will only pull 8 wagons up a 3% gradient. I’ve been trying to post a video but it would not load.

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49 minutes ago, scumcat said:

 I had 3 fully laden macaws behind my remotored 2475 also 7 fully loaded coal trucks, 6 loaded ballast wagons, 2 lime stone wagons and a brake. It pulled them with ease. Although it will only pull 8 wagons up a 3% gradient. I’ve been trying to post a video but it would not load.

You can't post video to RMWeb. It's not amongst the file formats allowed.

Andy Y explains it uses up too much capacity.

 

You need to use something like YouTube and post a hotlink.

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First repaint in the Oxford Rail Dean Goods. I still need to touch up a few places, etched plates, and a good amount of weathering. Colour is a custom mix by me, I do hope this will suit

 

Any comments for improvement will be helpful! :D

DF82F2CC-DC8D-4A26-BA00-7BF4A194B2CE.jpeg

Edited by Ribird
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Without going back through all 81 pages, was there ever a summary posted of which locos actually match the design features of the Oxford model?  If so I dont suppose someone could link it please?

 

I have just acquired one that is in a pretty sorry looking state via ebay, and want to see my options for renumbering (ideally to a loco which was in Bristol in 1947)  While I dont mind having to change the chimney, tender details, and other bits like that I would prefer to try and find a suitable loco with the right cab with and a cut out that matches the model.

 

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1 hour ago, The Fatadder said:

Without going back through all 81 pages, was there ever a summary posted of which locos actually match the design features of the Oxford model? 

 

It is the wider footplate version, 2451 onwards, as rebuilt. But none of them had the super-sized splashers...

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On 07/09/2021 at 13:25, The Fatadder said:

Without going back through all 81 pages, was there ever a summary posted of which locos actually match the design features of the Oxford model?  If so I dont suppose someone could link it please?

 

I have just acquired one that is in a pretty sorry looking state via ebay, and want to see my options for renumbering (ideally to a loco which was in Bristol in 1947)  While I dont mind having to change the chimney, tender details, and other bits like that I would prefer to try and find a suitable loco with the right cab with and a cut out that matches the model.

 

 

On 07/09/2021 at 14:44, Compound2632 said:

 

It is the wider footplate version, 2451 onwards, as rebuilt. But none of them had the super-sized splashers...

 

The lined GWR version also features the thin cab top which was only carried by a few locos, 2538 being the most obvious. It also has the top feed which was again rare and a poor rendition of the dished smokebox door, which was quite common up to the 40s or so. 

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1 hour ago, Quarryscapes said:

The lined GWR version also features the thin cab top which was only carried by a few locos, 2538 being the most obvious. 

 

Was that simply a case of failing to carry out the usual modification of raising the cab roof on fitting the Belpaire boiler? Recanted. See @Miss Prism below.

Edited by Compound2632
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