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

Discussion in 'Area 51' started by Nick Dunhill, 25 May 2017.

  1. Nick Dunhill

    Nick Dunhill Western Thunderer

    ...Thanks for the encouraging words guys. I have made some brass fittings to accommodate the copper pipework on the cylinder block/smokebox rear. I think the bigger brass castings are anti-vacuum valves and the long copper pipes are the high pressure oil/steam mix for the cylinders and valve chests. The pipes originate from the atomiser in the cab.

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    Tomorrow will be a nice day so no modelling, I'm off out on me motorcycle and the Ws can wait.......
     
    chrisb, 7mmMick, Lancastrian and 6 others like this.
  2. Locomodels

    Locomodels Western Thunderer

    I will second that. Superb work, and one can stand in awe of such craftsmanship.

    Regards,
    Paul.
     
  3. Len Cattley

    Len Cattley Western Thunderer

    I'll third that, awesome.

    Len
     
  4. Michael D

    Michael D Western Thunderer

    Really inspiring craftsmanship its wonderful to read each new post, keep them coming please
    Michael
     
  5. Tim Watson

    Tim Watson Western Thunderer

    Safety valve looks so much better. Clearly wouldn’t have been as per the original. Did the engines keep the spark arrestor in service?

    Tim
     
  6. Nick Dunhill

    Nick Dunhill Western Thunderer

    Yes Tim I kept looking at the top of the Ramsbottom SV cover and thinking ''Something not right here!'' Tom Burnham put me right.

    I assume the spark arrestor was a permanent fitting because the blower pipe is an integral part of the cage. I might be wrong though.....
     
  7. Nick Dunhill

    Nick Dunhill Western Thunderer

    ....I have made some lubricator pots for the Ws as the usual casting suppliers had none.

    The first ones are kiln shaped on an elbow. The pots were shaped in a mini drill and mounted over some bent rod, and fixing plate was added.

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    The second lubricators are more conventional slopey rectangular ones but with a stop valve and have one outlet. The bodies were made by filing a chamfer on one edge of some square brass bar and planting on some strip for the lid and tube for the valve. A hole was drilled for a copper outlet pipe and a brass ferrule, and the handle added. The pot could then be cut to the required length and a mounting plate added, made from waste brass boiler band material. On the real thing these feed oil to the bogie slides. Each one is made from 8 pieces, madness!

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    Some over complicated valves next..........
     
  8. Nick Dunhill

    Nick Dunhill Western Thunderer

    ....this one's just a quickie, I have made a couple of valves that sit atop the smokebox. One is the blower control and the other a steam control for the Westinghouse pump. Both have had their bodies shaped from rod with files in a muni drill. The fittings are made from telescoping tube, the nuts are tube filed into a hexagonal profile. The latter is easy to do in my pin vise as it has a hex chuck.

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    Window frames next....
     
  9. Nick Dunhill

    Nick Dunhill Western Thunderer

    ...so to the last of the lubricators. This one is for the valve guides and is mounted on the motion bracket between the slide bars. It is made from tube, rod and a 4mm handrail knob. A big thanks to DLOS who explained how to make the knurling on the knurled rings of the can.

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    Then on to the window frames. The frames are a circle of transparent acetate to represent the glass sandwiched between the brass outer and inner frames, a bit like the real thing. They are a push fit into the apertures in the cab. A massive thanks to Kevin Wilson for stamping me out the plastic discs.

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    Finally for this post I'm after a bit of help. Does anyone out there have a couple of etchings (or similar, maybe a left over backhead handwheel) they could spare me for the smokebox door handle wheels?

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    It's about 4.6 mm in diameter and I want to drill and tap the centre so I can make the handles work prototypically....
     
    Last edited: 20 March 2018
  10. Yorkshire Dave

    Yorkshire Dave Western Thunderer

    You mean the hinges don't work....:p !
     
  11. Scale7JB

    Scale7JB Western Thunderer

    Looks like a washer and a bit of thinly sliced tube to me..

    JB.
     
    adrian likes this.
  12. Nick Dunhill

    Nick Dunhill Western Thunderer

    It does. That's my fall back position!;)
     
  13. adrian

    adrian Flying Squad

    go on then let us in on the secret! I have various grades of diamond surface plates for cleaning up tools. I think I would try rolling them over the brass can on a cutting mat to texture the surface.
     
  14. Tim Watson

    Tim Watson Western Thunderer

    The trouble with 7mm scale is that you can put too much detail into it.

    Tim
     
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  15. Nick Dunhill

    Nick Dunhill Western Thunderer

    Hi Adrian, you're right. DLOS suggested putting the rings on a suitably sized drill to prevent crushing and rolling them between two files. It worked, although it's difficult to tell from the photos.

    Morning Tim, you could spin that another way, it's the advantage of 7mm that you can put a lot of detail on. ;)

    Nick
     
    Last edited: 21 March 2018
    Len Cattley, adrian and Andrew like this.
  16. Tim Watson

    Tim Watson Western Thunderer

    I’ll stick with a scale that no one can over 50 can see.

    Tim
     
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  17. Nick Dunhill

    Nick Dunhill Western Thunderer

    ...hand wheel made from threaded tube middle, a washer and a slice of thick walled tube.

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    Marvelous........
     
    chrisb, fenman, unklian and 9 others like this.
  18. Nick Dunhill

    Nick Dunhill Western Thunderer

    ... I have moved on to make the inner handles. The inner handles have a square hole to engage with the square shaft of the smokebox door dart. The pictures are pretty self explanatory I think, but it's drilled out to 1 mm to accept a 1 mm square rod and the corners are carefully cut out with a piercing saw.

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    This will rotate the dart in the crossbar and engage it, and the hand wheel tightens everything up.....
     
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  19. Tim Watson

    Tim Watson Western Thunderer

    Make sure you get a good seal on the smoke box door, Nick, otherwise the fire won’t draw.

    Tim
     
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  20. Nick Dunhill

    Nick Dunhill Western Thunderer

    ....the finished item, with a dart made from 1 mm square rod.

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    Next we get a 3D printed smokebox door.....