Well nearly a week on and virtually naff all to show for it
I spent ages cleaning up the previous pigeon
soldering and then pondered how to update the frames to BR guise...the history of A3 frames is rather complex, long and after a lot of reading, rather sketchy. What was interesting is that by the late 50's about the only part left of the original frames is the rear axle box area and Cartarzzi extensions, essentially new front frames were butt welded onto the original rear section and then a massive reinforcing plate secured inside, this blocks the rear oval hole but makes the first round hole double thickness.
You can still clearly see the weld join on Flying Scotsman today.
In the end I added this reinforcing plate but didn't bother with all the internal rivets, why, because they'd be a very poor representation of what's really in there and this is where the self doubt and course of this loco looks to be in jeopardy.
The problem is that there are a lot of errors in these frames, I know this'll sound like a whinge but I only did a weeks detailed research on the frames and the faults are, for me, quite depressing. I've had to undo and redo so much so far that it would probably have been better to just throw the frames at the Starlings crapping on my roof and CAD some new ones up. The half etch rivet holes are too small and when punched give the smallest rivets known, then there's half etched lines on the outside of the frames, which when bent still form a trough that needs filling, no problem except that its lined with punched rivets....that need to be punched before you bend...which means you can't fill it and smooth it without removing your neat, but small, rivets
On top of that, the Cartarzzi extensions are, well at the front end, a work of fiction. The final gripe are slots in the frames for the spacers, why oh why are these slots all the way through?, forcing modellers to fill or try and file/sand smooth tabs on visible parts of the model.
Hmmm, having re-read that last paragraph I've kinda answered my own debate...M.Y.F.O
Anyway having struggled through the above I've ended up here, two cleaned frames, with correct holes and un-correct holes filled, though I've just spotted the slot above the reversing arm shaft, which will have to be filled I suppose
; and two new frame spacers, not sure of the accuracy, really didn't think I needed to get the lighting holes the right size or corner radius, a rough facsimile would be a more accurate description.
I've also filled in the slots where the axles go and made new holes for the top hat bearings, still undecided whether to go rigid of CSB, will mull that over the weekend. Note the external half etch trench at the start of the Cartarzzi extensions, bad enough as it is, it's also in the wrong place and should be to the rear of that last line of vertical rivets. I also removed all the springs and associated hangers, to be replaced with Ragstone examples
I haven't shown the inside of the frames, best not really and if a lot of the patchwork quilt inside is visible under the boiler, which I think it may be, then they will go straight in the bin.
Close up of the two new stretchers, the front one needs some beefing up in the lower centre where the middle slide bar attaches, this view also shows quite well the filled in holes up front, they are smooth, but smoothing around already formed rivets is a painful exercise, note also slot above reversing arm shaft and for some totally inexplicable reason a slot above the middle driver for a fictitious spacer to poke through and be soldered.
This is all a shame really as I've been looking forward to an A3 for a long time and DA is generally very good for what you pay, still, onward and upward.