This morning I added the semicircle of spare etch attached with a couple of small bridging pieces made from scrap etch.
I had already rolled the boiler but hadn’t soldered the seam so that was done next and then I realised that the two slits which allow for the curve out of the smokebox base the fit the smokebox saddle hadn’t quite etched right through. A simple task to cut down it with the piercing saw once the seam was soldered. But equally had I noticed it before rolling the boiler I could have done it in the flat with a blade.
There are some tabs on the ends of the inner frame at the firebox end but I can’t see any corresponding slots in the cab front, so I think I will have to cut those off to get it to sit in place correctly. But that will be a task for next year when I resume.
Progress has been slow this weekend, but a mystery has been unravelled.
You may recall that when I started the footplate, I couldn’t find two out of four part 60’s? Well today I found them…
I started yesterday’s session by rolling the boiler and it mentions using part 52 to ensure that it’s round.
This is the drawing of part 52
I found it amongst the remaining bits of etch and tried it in the boiler all was well.
Then I started to assemble the inner support frame for the boiler using the diagram below and photos of my previous build.
In my previous build I hadn’t used part 52… so I started questioning why not.
Although I obviously hadn’t worked it out before due to lack of experience it quickly became apparent that there was something wrong with part 52.
The photo above shows both sides of part 52 as etched. Although it’s one piece when you check against the drawing snip above it should in fact be three parts, 52 and 2 x part 60 (the missing parts). It looks like when he drew the artwork Garth Patrick got these bits on the wrong layers and the bit’s that should have been etched though have been half etched on one side and the outer ring which should have been full thickness has been half etched on the back making the part completely useless. I contemplated cutting the ring out with the piercing saw but I obviously managed without it on my build so could on this. As it happens in my spare etch box I found a semi circle the correct diameter which I will attach with a couple of bits of scrap to support the firebox end of the boiler tube.
I have been distracted for the last few days by teaching myself to draw in QCAD with a view to getting a few things etched. Before that I had made some progress on the rest of the inside valve gear.
Early in the week Tony Geary kindly pointed me at a photo of the inside valve gear on a 7 ½” gauge N2. Armed with this as a starting point I searched online and found a Facebook page chronicling the guy’s build. In his photo section I found loads of photos which have gone a long way to clarify in my mind what I was struggling to interpret from the GA.
I have a few photos of the full sized N2 valve gear which again are great for showing how things fit together above the slide bars but not below which is the area that I was struggling with. The build photos have clarified things now I just need to make up all the parts. Unfortunately, most of mine will need to be made from scratch as my spares box is nowhere near as comprehensive as Tony’s.
The sections are just resting in place for the photos I have a lot more to attach to both the motion plate and cylinder front before finally joining them.
I am pleased to say that the replacement side has been a complete success and even in bare metal, if you didn’t know I doubt that you could tell that it wasn’t original.
Each side has a couple of ovals representing works plates so I used some off cuts to file up a couple of replacements and soldered them in place before fitting the side. I took measurements of the side that I had taken off to get the correct placement.
Before finally soldering the new side on I fitted the front and rear of the cab and the cupboard on the cab and their overlays.
Once they were all in place, I added the beading around the cab opening. Although I am sure that I used them last time I failed miserably to get the beading to slot onto the tabs in the cab openings. In the end, I filed them off and did it as I would have if there had been no tabs. Using the opening as a former I pre-bent the beading to shape and them with the aid of self-locking tweezers soldered them in place. I will have to revisit one of them as while taking photos this morning I noted a couple of small gaps that need filling.
Today’s model making session saw the replacement side created. I still need to solder it in place but I am going to fit a few other bits first. It would have been much extra work to add all the tabs so it will need a little more care to fit some parts in place without the help of the tabs but most kits don’t have tabs on these particular parts so it should present too much of a problem.
The basic rectangle was cut out with my guillotine and the shapes/cab opening cut by hand with a piercing saw (fitted with a no 6 blade – very fine). I cut close to but not quite on my scribed line, then filed to final shape with various files and small drum sander in my mini drill.
After reading Tony’s struggle to fit all the inside motion in his J6 and observations made on a couple of forums by Ian Middleditch and Jim Snowdon. I decided to take the plunge and cut some new frame spacers to give me more room to play with. With the new spacers I have given myself a couple more millimetres. The downside is that I need to make a new motion bracket but I am sure it will be worth it.
This weekend was a one step forward and two back, weekend. I added the sides and fitted the coal bars to the rear cab side sheet and also dry fitted the cab front and inner cab rear.
Where it took a step backwards was on one side, I wasn’t sure that the middle of the tank side had soldered properly to the inner former so I ran the soldering iron over it. Unfortunately, due to the very thin material of the overlay (0.1mm) it left an indentation where I had run the iron.
After consulting with Brian, I removed the side and attempted to remove the indentation but as I suspected it wasn’t possible so I will use the side as a template to make a replacement side from nickel sheet.
Not a great deal to show for this week’s efforts on the J6.
I filled in the lightening holes in the front of the frames as the photo that I am working from doesn’t show any. I also cut away the bottom of the etched ashpan sides and fitted a representation of the bottom. This may need a bit of trimming to clear the gear wheel once finally fitted.
The rest of the time has been spent patiently filing the hornblocks, hornguides and the cranks to enable the cranks and eccentrics to fit between the centre hornguides and rotate freely.
Due to the need to get the loco around 5’6” curves the frames are a bit narrower than they might have been if I had been building for myself.
I didn’t have much in the way of modelling time this weekend but I managed to make some progress.
I had cut out the footplate and valances last weekend so they were quickly put together via the tabs. The buffer beams were easily laminated and then again attached via tabs. There are four fold ups that represent the ends of the timber backing to the buffer planks these sit in a recess made up from some strengthening plates (parts 89 and 90) Parts 89 are dotted about the etch so took a bit of tracking down. Parts 90 are shown to be quite close together on the plan of the etches but despite spending the best part of an hour looking I could only find two of the four so I cut some replacements from scrap etch and cut one of the tabs off a couple of the part 89’s
With all the parts found or made it was a simple job to solder it all up to make solid footplate. Then comes the task of chopping all the bits out of the inner cab/tanks/bunker and attaching it to the footplate.
You need to read the instructions thoroughly at this point because if you twist all the tabs you cannot get the overlay to sit in the tab holes. You also need to fit the inner tanks before fitting the overlay because you need to file off all the twisted tabs to get the overlay flat – you will note that in my photo the overlay is still loose as I haven’t filed off the tabs yet.
Talking of tabs, there is much mention of tabs in the instructions at this point. The cab beading has slots for tabs You will note that to make life a bit easier when fitting them I removed the tabs from the door opening on the inner etch but left them on the overlay. This was a trick I learned from the last build.