G-Train Locomotive Works / Graeme King Joint Venture - GCR/LNER 4-6-0s - B3-2 & B7 to follow

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croesnewydd
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Re: G-Train Locomotive Works / Graeme King Joint Venture - GCR/LNER 4-6-0s - B3-2 & B7 to follow

Post by croesnewydd » Wed Jun 26, 2019 8:21 am

10411 2 LNER GCR 2) GA of 4-6-0 passr engine B3 Class GC/LNE
I got this from the NRM back in 2014 - it is still on their lists.

I also have the B7/9Q from MOSI but this has to be stitched together since is comes in around 70 blocks

John

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Atlantic 3279
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Re: G-Train Locomotive Works / Graeme King Joint Venture - GCR/LNER 4-6-0s - B3-2 & B7 to follow

Post by Atlantic 3279 » Wed Jun 26, 2019 12:44 pm

A useful reference, thank you.
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Tim Watson
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Re: G-Train Locomotive Works / Graeme King Joint Venture - GCR/LNER 4-6-0s - B3-2 & B7 to follow

Post by Tim Watson » Sun Jun 30, 2019 10:15 pm

The kit makes up very well for the motion bracket and slide-bars, but it is a bit fiddly!

Image

If anyone can produce a good clean GA of the 9P, I would be happy to pay costs. The drawing in Johnson’s book is very frustrating to try and interpret.

Tim

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Re: G-Train Locomotive Works / Graeme King Joint Venture - GCR/LNER 4-6-0s - B3-2 & B7 to follow

Post by 9E » Sun Jun 30, 2019 11:09 pm

Tim,

If it is what is what rather than dimensions you are trying to get your head around, if you have not already done so,
then you could do worse than look at the close up of the 9Q on p105 and the part-dismantled 9Q on page 118 of EM Johnson's book.

Simon
Last edited by 9E on Tue Jul 02, 2019 5:28 pm, edited 1 time in total.

Horsetan
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Re: G-Train Locomotive Works / Graeme King Joint Venture - GCR/LNER 4-6-0s - B3-2 & B7 to follow

Post by Horsetan » Tue Jul 02, 2019 12:11 am

Tim Watson wrote:
Sun Jun 30, 2019 10:15 pm
....If anyone can produce a good clean GA of the 9P, I would be happy to pay costs. The drawing in Johnson’s book is very frustrating to try and interpret. ...
I have scanned the MOSI drawing in Johnson vol.2 and can zoom in well enough to read at least some of the measurements, but a clean GA (and its related drawings) would be better. At the time when I bought the 9Q GA (excellent as a full-res colour digital download, by the way) from SSPL, I did ask the image licensing officer at the Science Museum Group if he could help me track down the 9P one, and he said he would ask his colleague about availability. Not had any comeback so far.

In the meantime, the Brassmasters inside motion etches (plus some ex-Finney brass eccentrics out of the T9 kit) have arrived and now begins the head-scratching process of tailoring the etch parts to fit. The ex-Finney eccentrics speak for themselves and are easy to use, but the lead axle crank webs - which are also circular - are not much bigger and I can see a fine old time trying to either:

1. adapt what are etched eccentric cams into cranks! or
2. use the T9 cast brass cranks, but severely reduce the webs (which are massive) to something approximating the 9P/B3 shape.

The B3/1 frames have been marked out for CSB pivots using the suggested measurements given on the CLAG website, with one drill bit snapped so far to show for it.

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Re: G-Train Locomotive Works / Graeme King Joint Venture - GCR/LNER 4-6-0s - B3-2 & B7 to follow

Post by Tim Watson » Tue Jul 02, 2019 7:41 am

I know it’s not the purist’s way, but why not simply drive the internal valve gear from the Finney eccentrics, with rockers connecting to the outside cylinder valves, as per the kit. You simply won’t see the internal pistons, crossheads & con rods working, as they are at the bottom of the frames.

I have represented the top of the internal valve gear on my engine, but I doubt that making the outside valves move will be particularly visible, tucked up under the valance with the drain cock linkages in front.

Tim

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Re: G-Train Locomotive Works / Graeme King Joint Venture - GCR/LNER 4-6-0s - B3-2 & B7 to follow

Post by Atlantic 3279 » Tue Jul 02, 2019 8:49 am

To wear, or not to wear the hair shirt, that is the question....
Most subjects, models and techniques covered in this thread are now listed in various categories on page1

Dec. 2018: Almost all images that disappeared from my own thread following loss of free remote hosting are now restored.

Horsetan
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Re: G-Train Locomotive Works / Graeme King Joint Venture - GCR/LNER 4-6-0s - B3-2 & B7 to follow

Post by Horsetan » Tue Jul 02, 2019 12:32 pm

Tim Watson wrote:
Tue Jul 02, 2019 7:41 am
I know it’s not the purist’s way, but why not simply drive the internal valve gear from the Finney eccentrics, with rockers connecting to the outside cylinder valves, as per the kit...


I had considered this, but......
...You simply won’t see the internal pistons, crossheads & con rods working, as they are at the bottom of the frames.

I have represented the top of the internal valve gear on my engine, but I doubt that making the outside valves move will be particularly visible, tucked up under the valance with the drain cock linkages in front.
.....there is so much open space between the frames in that area that to me it seemed a shame not to try to fill it. In a way, I blame Graham :mrgreen: for designing in the partial valve gear with "short-cut" eccentrics in the first place, and I thought why not just go the whole hog? The drawings for it sort-of exist.....
Atlantic 3279 wrote:
Tue Jul 02, 2019 8:49 am
To wear, or not to wear the hair shirt, that is the question....
It's not because I want to. I have to.

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