Nick Dunhill's 7mm workbench.

Steph Dale

Steph Dale

Western Thunderer
Paul,
They're not right; on the prototype the pipes are suspended from the injector water valves and two lightweight strip brackets.
Steph
 
Nick Dunhill

Nick Dunhill

Western Thunderer
Hi Paul. As Steph says the pipes have a thin U-shaped strap that attaches to the rear drag beam. The etching to the left in the mk1 photo is of the thing supplied in the kit to represent the rear spacer. Quite a difference..

Nick
 
Nick Dunhill

Nick Dunhill

Western Thunderer
Yeah loads. The frame spacers in this kit are nothing like the real thing. The whole chassis is compromised by the desire to fit rocking beam compensation (shows it's origin in 4mm). I've got a bit obsessed with making the bit between the chassis as prototypical as possible.
 
Nick Dunhill

Nick Dunhill

Western Thunderer
.....yikes!!!

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After a long debate with myself I have cut off the portion of the chassis that intrudes into the cab. Martin Finney has designed an elegant system where the the cab floor fits into a slot in the chassis and can be withdrawn when the model is dismantled but....I think I will be able to incorporate a higher level of detail if it is all fixed in place. The cab is so open that it shouldn't be an issue for the painter (Warren?)

20141220_132539_zps3da395e0.jpg

20141220_132524_zpsb8b54b3c.jpg

The chassis has now been assembled using all the stretchers that have been made over the last week or two, they are all prototypical, and in the correct positions.

Wheels on next........
 
Nick Dunhill

Nick Dunhill

Western Thunderer
....and here we are.

All fitted up and running perfectly. The wheels run very true and the only slight issue I had was the crankpin screws not being perpendicular to the wheels causing binding in odd places (i.e. not top dead centre!!)

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And here's one fitted up with LGM cast crankpins (freebies left over from other projects, yay!) and the screws trimmed to length.

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Bogies next.......
 
Nick Dunhill

Nick Dunhill

Western Thunderer
The thing here is that the front driver has end float (which will disappear when the cranks and eccentrics are fitted) and the rear driver has none. I could though find 0.5mm or so end float on the rear drivers if required by grinding a bit off the outside of the bearings. Will I need it though?? The kit is designed so that the front section of the chassis (ahead of the cylinders) slopes in if required, I hope not to have to. We will see.....
 
Steph Dale

Steph Dale

Western Thunderer
Nick Dunhill said:
The kit is designed so that the front section of the chassis (ahead of the cylinders) slopes in if required, I hope not to have to. We will see.....
Click to expand...

I suspect you'll need to - but you'll have the loco upside down to tell! And that's assuming you're going to find the sideplay on the back axle...

Steph
 
Overseer

Overseer

Western Thunderer
Have you checked the GA or frame drawings to see if the prototype had tapered front frames? Quite a few 4-4-0 locos did have frames which were narrower at the front buffer beam than they were at the cylinders to provide a bit more clearance for the leading bogie wheels.
 
Steph Dale

Steph Dale

Western Thunderer
Yep, oh so many times; when I shut my eyes it's all I see.... :D

The prototype (and kit) have a joggle in the frames just ahead of the cylinders, but they don't taper. However the prototype won't go around a 250 ft radius curve.

Steph
 
Nick Dunhill

Nick Dunhill

Western Thunderer
...well it was nice to have a week off, but back on with it over the last day or two.

I have made a (very near) prototypical frame spacer for the front bogies. I say near because it is built up out of bits of C-section and square brass I had in stock, and scratchbuilt parts. The leaf spring is a plastic one sourced from parts left over from a Slater's wagon kit.

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20150104_162158_zpsb00435e8.jpg

The upper part is the bogie spacer provided in the kit. Sorry Richard I did not polish the part before photographing so it looks a bit scruffy!

Next I will fit the balance beams when the fake fastners arrive from the US, and build the side control mechanism......
 
Steph Dale

Steph Dale

Western Thunderer
As we discussed yesterday, and from looking at the photo, you'll get a smidge more travel out of the rear drivers too...

And I take that now is not a good point to remind you of the missing joggle in the bogie frame? I hope it'll still fit around the motion bracket. Oops, cat - bag...:rolleyes:

Steph
 
Nick Dunhill

Nick Dunhill

Western Thunderer
Help. I had a stash of springs from buffer stocks or the one that fits behind a buffer beam to spring load the coupling. I have used them up on the side control for the bogies on the Princess project I have just completed. Does anyone know where I can get some more?

Ta

Nick
 
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