Atlantic's works: A needlessly complicated D7?

This forum is for the discussion of railway modelling of the LNER and its constituent companies.

Moderators: 52D, Tom F, Rlangham, Atlantic 3279, Blink Bonny, Saint Johnstoun, richard

User avatar
Atlantic 3279
LNER A4 4-6-2 'Streak'
Posts: 5903
Joined: Fri Jun 26, 2009 9:51 am
Location: 2850, 245

Re: Atlantic's works: J21 continues

Post by Atlantic 3279 »

After a slightly frustrating session of trimmimg bits of, checking, finding that I'd either trimmed not enough or too much, then either trimming more or sticking pieces back on, I eventually felt I was somewhere near to the intended result and that I could add two small tongues of 0.25mm plastic to the underside of my "bunker conversion piece" to complete the tops of the tank arms at the front. I also added a 0.5 mm strengthening layer to the back of the boards that close off the front of the coal space between the tank arms, and cut out an approximation to a shovelling hole. Compared to the black Hornby Q6 tender, and the pale grey un-modified print, my converted trial piece now looks like this:
DSCN0703.JPG
The tool boxes will be able to sit apart more effectively on the final version once I've trimmed inside the side cornices more thoroughly.

What I can't quite decide now is whether I've trimmed a shade too much from the front edge of the top sheet, exposing a little too much of the coal space in front of the toolboxes, and making it necessary to fit those boxes tightly against the front of the upper coal plate. I could easily add back a thin slice of plastic to give the boxes a marginally deeper shelf on which to sit. Opinions of the knowledgeable would be most welcome.
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.
User avatar
Atlantic 3279
LNER A4 4-6-2 'Streak'
Posts: 5903
Joined: Fri Jun 26, 2009 9:51 am
Location: 2850, 245

Re: Atlantic's works: J21 continues

Post by Atlantic 3279 »

Pending final thoughts on the correct appearance for the front of the tender, I've turned my attention to the coal rails. Paul's print includes a set of course, so if you are happy with those they only need painting.
I chose to look at the possibility of alteration for a combination of reasons. The one photograph of which I am aware showing one of these locos in my home area features No 289 at New Holland, probably around 1932, and its tender clearly has added coal rails, giving a total of four around the coal space and three around the water filler area. If I could succeed in making a suitable full set in stiff brass wire it is likely that they would be stronger than the printed resin ones. Additionally, I might be able to produce square rear corners rather than rounded ones, as well as arranging for the rails to curve down and terminate in a slightly different position near the front of the tender, so as to agree more closely with my interpretation of photographs I've seen of these tenders.

I began by having a go at producing a spacing gadget for the rails. A drawing had given me the impression that if I made the rails from 0.7mm brass wire and spaced them using 0.45mm brass wire then the height would come out about right. I therefore assembled this selection of pieces of wire on two layers of double sided tape on an offcut of card:
DSCN0708.JPG
The L shaped bits would eventually act as the spacers for the rails. The middle three are 0.45mm wire, the outer two are 0.7mm for greater strength / stiffness. The straight pieces are all 0.7mm wire ensuring that the spaces between the upright legs of the L shapes are wide enough to accept 0.7mm rails.
A good application of solder was used to hold the whole lot together.
DSCN0709.JPG
Another layer of card (as a bit of a heat shield) wrapped in double sided tape was added over the solder, and I could then position some coal rails, with front curves pre-formed, something like this:
DSCN0710.JPG
After carefully adjusting positions of the rails to line up the curves using a good photograph of the right type of tender as a guide, I could then solder the first of a series of uprights across the rails. It rapidly became obvious that is is easiest to tin the full length of each rail, and the wire that is to form each upright, and that the uprights can be held, positioned and soldered most easily if they are initially of greatly excessive length. After each upright was added, the "tool" could be moved along the rails to a position adjacent to the intended next upright. One of the snags I encountered was the effect of heat on the double sided tape, which was supposed to be holding the rails in place for soldering, as its adhesive tended to melt and lose its stickiness in the heat. Anyway, after not too much sweating and profanity, compared to some of my performances, I currently have these completed sets of rails and uprights, trimmed to more or less the right dimensions.
DSCN0713.JPG
The remaining challenges now include:
1. Forming the lower parts of the uprights to fit into suitable drilled holes inside the top edges of the tender print, with the rails correctly "stepped out" to sit above the very edges of the cornices.
2. Trimming to final length and filing a mitre to get neat square rear corners without gaps.
3. Soldering the rear corners without damaging the 3D print or ruining the carefully spaced soldered joints already made on the rails.

It should be fun!

Once they are fitted and the rear corners soldered, I can glue some "plating" inside the rails around the coal space.
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.
mick b
LNER A4 4-6-2 'Streak'
Posts: 3401
Joined: Tue May 30, 2006 4:43 pm

Re: Atlantic's works: J21 continues

Post by mick b »

Graeme
Like this one ?,a Dave Bradwell version.
fullsizeoutput_38e3.jpeg
fullsizeoutput_38e4.jpeg
fullsizeoutput_38e5.jpeg
fullsizeoutput_38e6.jpeg


Dimensions

Tender Tank front to Coal Plate/Divider 16mm

Tanks 9mm wide note rivets all round the top curve curve

Rear 10mm from rear to Coal plate/Divider

ToolBoxes 12mm wide x 6mm deep

Mick
mick b
LNER A4 4-6-2 'Streak'
Posts: 3401
Joined: Tue May 30, 2006 4:43 pm

Re: Atlantic's works: J21 continues

Post by mick b »

fullsizeoutput_38e7.jpeg
Everything is straight , the Camera lens was having fun !!
User avatar
Atlantic 3279
LNER A4 4-6-2 'Streak'
Posts: 5903
Joined: Fri Jun 26, 2009 9:51 am
Location: 2850, 245

Re: Atlantic's works: J21 continues

Post by Atlantic 3279 »

Thanks Mick, those are very useful. There's a bigger gap revealing the coal space in front of the toolboxes than I would have imagined. The dimensions are handy to know. The tanks fronts are not as wide as 9mm on the printed version, the side sheets being thicker than metal ones of course, limiting the internal space. I'll check the coal plate positions against those figures, and against scaled photographs. "Confirmation", if a model can confirm anything, of that short horizontal handrail on the rear, may lead to me adding one of those too. I'd only seen the backs of the larger, more modern tenders in photographs, and the rear handrails on those had made me wonder whether the older, smaller tenders were similarly equipped.

I seem to have got my modified toolbox sizes right anyway.
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.
mick b
LNER A4 4-6-2 'Streak'
Posts: 3401
Joined: Tue May 30, 2006 4:43 pm

Re: Atlantic's works: A needlessly complicated D7?

Post by mick b »

Normally just a "rail" no knobs normlly used on NER engines . The NYMR J27 is the same , sadly they have stuck two steps on the rear as well , totally wrong for in period.
Post Reply