Computer Aided Wagonry

[Pugsley]

Like an itch you just have to scratch, I've ended up tinkering with this project, rather than the weathering that I was planning on doing.

The errors are cropping up thick and fast now, with a discrepancy in the overall height discovered, which is almost certainly what was wrong with the roof. Now I've slipped a millimetre in there, and raised the roof by the same amount, it's looking more like it. I've double checked the ends against the dimensions I have, and they're right, so the upper section of the doors are angled correctly.

I've also noticed that the end supports project too far, so these will need to be trimmed a bit, and the ribs on the end will also need to be changed, as they appear to be flush with the outer panel, rather than under it.

Ho hum. At least I've spotted them before it's too late.

 

[Pugsley]

It's been a while since I updated this thread, but a lot has changed with the design since the last post. I've redone both ends, as I wasn't happy with the bracing looked, reduced the depth of the end stanchions, changed the buffer heads and made a few changes to the roof. The result so far looks like this:
I've also drawn up a representation of the brake gear, which will be a mix of castings and etchings, around some 0.7 and 0.9mm wire. Whilst I can't claim it's 100% accurate, it's a pretty fair representation based around photographs, measurement of the various components from different wagons and some educated guesswork! A helpful diagram was also posted 'in the other place' that helped me greatly with what was connected to what, and how



More fiddly bits to do now, and the roof needs trimming back from the ends a bit further. I also need to study my photos a bit more in this area. In some it doesn't look like the roof protrudes over the end, but in others it does.

I'm going to modify the brake shoes, so the carriers will be etched and the shoes slot into it, much like the prototype - the current ones designed to be cast in one piece will be a bit chunky, I think. This, with a few other small door related parts, is almost it - the design phase is nearly over. However, the next process of turning the sheet components into a fret for etching is going to be quite time consuming, I think.

 

[tomstaf]

Hi Martin,

It's looking good indeed, the buffers in particular. Far more solid now you've added lots of the details. I can try and track down a prototype if you like and take close up shots. Are there any particular areas you're in need of?

Cheers

Tom

 

[mickoo]

Very nice render and progress so far!, must pull my digit out and crack on with my CAD/ model project..just need to finalize subject matter LOL.

Kindest

 

[28ten]

Thats coming on looking at the shot, how are you springing the buffers? Good idea with the brakes, its not just for chunkiness but strength as well.

 

[Dan Randall]

Superb work Pugs!


Regards

Dan

 

[lancer1027]

That is EXCELLENT

Rob

 

[Pugsley]

Thanks everyone!

I can try and track down a prototype if you like and take close up shots. Are there any particular areas you're in need of?

Thanks for the offer Tom, although I think you'll struggle to get anywhere near one of these, as AFAIK they're all in use. It would only be shots of the underneath I'd need, I've got external shots from Long Marston for everything else.

Thats coming on looking at the shot, how are you springing the buffers? Good idea with the brakes, its not just for chunkiness but strength as well.

The buffers are designed to be self contained, and work in the same way as the prototype, with the head part sliding over the shank. The spring will be trapped between the head and the end of the shank, with the head being contained by screwing into a 10BA nut. The nut is retained in the housing, and doesn't project beyond it, so they are completely self contained.

Here's a thousand words:

The spring and nut aren't shown, but the spring will be trapped between the end of the grey part and the red part. There's no prizes for guessing where the nut goes

The buffers will be made up from the 3 cast components as shown, but I'm not sure what they'll be cast in yet, although I'm beginning to think that lost wax brass is probably going to be the most suitable for them.

 

[Dog Star]

How will you prevent the buffer head from rotating?

JLTRT has cast a keyway into the buffers for the Cl.37..... and slightly out of alignment I think.

 

[mickoo]

Shouldn't the brown bit be smaller in dia than the grey, and I think the foot grip (if fitted) should be on the grey buffer moving part I think, if its a standard Euro fitting.



Kindest

 

[BrushType4]

Shouldn't the brown bit be smaller in dia than the grey, and I think the foot grip (if fitted) should be on the grey buffer moving part I think, if its a standard Euro fitting.

View attachment 12153 View attachment 12154

Kindest

I think you are reading the diagram wrong. The red part is the buffer. The grey piece is the mounting and the brown bit fits to the buffer and slides over the grey mount.

 

[BrushType4]

How will you prevent the buffer head from rotating?

JLTRT has cast a keyway into the buffers for the Cl.37..... and slightly out of alignment I think.

Superglue? I think Martin has this exactly right, I think it will make it needlessly complicated to add a keyway.

 

[Dog Star]

quote="BrushType4, post: 40833, member: 153"]I think it will make it needlessly complicated to add a keyway.[/quote]

I agree... the JLTRT castings are a b****r to clean up and get to work smoothly.

 

[mickoo]

I think you are reading the diagram wrong. The red part is the buffer. The grey piece is the mounting and the brown bit fits to the buffer and slides over the grey mount.

[palm- face/]
I'll stick to container ships LOL.

Kindest

 

[Pugsley]

Superglue?

That's the plan - just a small dab to stop any unwanted movement, so the buffer can be disassembled if required.

The orange part fits on to the head - it's a separate part for casting purposes, which will be soldered on. Otherwise, the design is exactly as Phil described.

 

[Jordan]

Superb stuff!!

 

[Pugsley]

Here's how things stand at the moment:


I've added more of the detail parts around the doors, and more of the actuating gear. I've also trimmed the roof back a bit, which has made a vast difference to the appearance. There' s not too much left to do know before I can focus on turning it into reality, although I'm sure I find more things to do every time I complete a part of it!

 

[Pugsley]

More progress:


Although things have slowed considerably, as I'm finding that bits I'm adding now are highlighting things that I've got wrong previously. A good example of this are the springs - with the correct curvature, the axlebox doesn't sit in the right place - they're a bit squashed at the moment - I need to get another millimetre in there somehow - mostly by shortening the suspension mounts.

Other than that, there's only a few more bits to do, mostly the handbrake wheels and associated hardware. I'm hoping to be at the artwork stage by the end of the week.

 

[28ten]

You built that second one quickly Im looking forward to seeing this move from concept to something tangible

 

[Dan Randall]

You built that second one quickly Im looking forward to seeing this move from concept to something tangible

You and me both! There's some very inspirational work going on here Pugs. I wish my 3D fumblings produced results as quickly as yours. Mind you, I do have at least half a dozen different projects on the go - I can't seem to discipline myself to get any one of them finished....!

Anyway, roll on the next installment...


Regards

Dan