Nick Dunhill's 7mm W (A6) or Whitby Tank Workbench

[JimG]

I think I only ever saw ex police velocettes. We're We'y not a little 2 stroke that would hardly pull itself.

They were an opposed twin, water-cooled, four-stroke, shaft drive. The earlier models were 175cc but the later models, like mine, were 200cc and the Met bikes were 12V. They certainly weren't fast bikes - I think I remember doing anything over 50mph as an occasion - usually downhill. But they were superbly balanced with a very low centre of gravity. I could roll a cigarette on mine while commuting between Dumbarton and Glasgow.

Jim.

 

[Nick Dunhill]

Hello Peter. It's a 1969 BSA B44 Victor Special.

 

[Peter Cross]

Thanks only ever had one BSA. An old Goldie 500. The twins if I remember had both pistons going up and down at the same time. My last rebuild was a 1969 Triumph Daytona. Wish I still had it. Was by far the best I had, once I got brakes on it that worked.

 

[Len Cattley]

I had a 1962 Bonneville.

Len

 

[Nick Dunhill]

.....so, I have made and installed some guides, as per drawing, for the radial truck. My drawing has no detail whatsoever of the make up of the radial truck. Does anyone have a picture or drawing of one that may be similar?

Thanks.............

 

[tomburnham]

Hi Nick,

This is a drawing of the radial axlebox designed by T. W. Worsdell for the G.E.R. Class G14 and as used on the N.E.R. Class A
2-4-2T,



and here is the arrangement of the radial axle for the N.E.R. Class B 0-6-2T reproduced from The Engineer, 23 Nov 1888.




The Darlington Drawing List at the NRM also has under drawing numbers 741 and 742 a radial axle box, probably for the N.E.R. Class B, and drawing number 7597 for the N.E.R. Class Y, which may be more suitable as it is closer to the date of the Class W.

Cheers,
Tom.

 

[Nick Dunhill]

Brilliant thanks Tom. All I have to work out now is what it looks like from the bottom.

 

[Rob Pulham]

Thanks too from me Tom, I just happen to have an LNER F8 that has stalled at the radial trucks.....

 

[Nick Dunhill]

Anyone know where I can get some plastic operating (wagon?) springs to make the centering/side control work?

 

[Nick Dunhill]

Well done. You need a bit more stamina though.

 

[7mmMick]

PM sent with all the drawings you should need mate

 

[Lancastrian]

Anyone know where I can get some plastic operating (wagon?) springs to make the centering/side control work?

Nick,

Try Hobby Holidays for their phosphor bronze wagon springs.
Hobby Holidays online shop

Ian

 

[Nick Dunhill]

.....so here's the radial truck under construction. No secret just lots of measuring and sanding...

 

[Brian McKenzie]

Nick,

I'd be watchful that your radial truck doesn't bind up, after any lengthy period of inactivity. There's a lot of same type material surface contact there that can oxidize, or jam with the slightest whiff of flux or blooming from glue or whatever. Not sure how you can combat this (which I've experienced). Perhaps line one surface with PTFE cloth tape or similar? It's expensive, but maybe procurable from anyone that uses a heat-sealing machine for plastic bags.

Brian McK.
(who was pleased to read your acknowledgement of James Harwood's outstanding model work. I can't even adjust myself mentally to contemplate doing stuff to his standard.)

 

[Nick Dunhill]

...the radial truck for the W class is now complete and installed. It (I hope) captures the appearance of the prototype. Side control is achieved using two tiny coil springs, with a slightly bigger one for downwards force.

Front bogie next. Hopefully slightly less challenging......

 

[Yorkshire Dave]

There's a lot of same type material surface contact there that can oxidize, or jam with the slightest whiff of flux or blooming from glue or whatever. Not sure how you can combat this (which I've experienced).

A smear of an inert thin synthetic oil or PTFE grease should suffice.

 

[Scale7JB]

Have to say, I've got radial trucks on 3 engines (F5 has got two), and no problems at all so long as it's all nice and clean. Saying that, they are still in bare brass, and have been for a few years now.

I think the key is not making the tolerance too tight.

JB.

 

[tomburnham]

Nick,
I think you'll find the bogie just as challenging as it also features a curved slide, controlled by two plate springs, as shown in this drawing of the standard N.E.R. bogie.



Unfortunately the Darlington drawings for the Class W do not appear to have survived but you will be able to refer to your photo's, reproduced here, of the similar Class X and Y bogie drawing for adding detail.
Tom.

 

[7mmMick]

I have some good pictures of the new build G5 bogie if that helps as well Nick?

 

[Nick Dunhill]

Thanks Mick but I think I have all I need for now.