Just catching up on this, wow, bloomin realistic as ever, Nick. Great pics, great work.
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I created an account here solely to give props to @Stickframe
At first, I thought this was a 1/25 build - imagine my amazement when I realized this was 1/35. Incredible. Phenomenal build, hats off to you.
If I may, I would love some more detailed photos of the drivetrain -particularly the tandem axle- as I’ve been toying with a scratch-build of my own, loosely based on the Scammell Pioneer. I don’t have many photos posted RN, but I’ve been designing parts (amateur CAD) strictly from the photos I can find online, as I do not own any of the 1/35 model kits.
For reference, and with no interest in hijacking this thread, below are two 1/25 Mad Max-inspired projects I started before life demanded much more time. You can see some of the Scammell influence in the Volvo Sugga TP21 - most of which is FDM and SLA printed, frame excluded.
https://www.artstation.com/artwork/9m9AQq
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Welcome and those builds of yours look pretty impressive … very MadMax - apocalyptic looking …
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Hello @jpl3k , welcome to the forums, and thanks, glad this caught your eye! Your 1/25 projects are something else! Unhappily for me, my approach is lot more low tech than yours - lol - I look at photos and try to get it to look close to what it’s supposed to 
As for the rear end, in general terms, it is essentially a powered walking beam:
Unhappily, the GIF above is tiny, so a bit hard to see - but, what you can see, in the foreground, the beam, walking! Note the big disk in the center - it’s where the driveshaft enters from the rear diff, but also has a bearing and bushing which allows the beam to move up and down. In the background, you can see the leaf pack. Below, is a clear image of a conventional walking beam:
For this, pay attention to the suspension, which is a pair of leaf packs, which mount at a pivot to the center of the walking beam.
This is a good pic of the actual walking beam:
You can see front and rear output shafts, and the pivot point in the center. As for what’s going on inside:
A front and rear gear drive is located within the walking beam housing.
The two above are from the project - you can see the central diff and axle, with the beams on the outside. While a challenge, I’ll bet you could make this - the image below is from a 1/24 project I’m working on:
While this is from a conventional rear end, the principle is generally similar. You can build up a pair of leaf packs, then make a single axle/diff and install - then, get after the walking beam, which you could make.
You might consider using a rear diff from a kit, then modify the axles as you need (ie continuous alu or brass tube which you could run through a mount on the leaf pack and then directly into the walking beam. You could then add the support brackets once the beam is attached to the axle.
As for the leafs, you can make them too. This is a really heavy duty pack - you probably don’t need so many leafs!, but you might consider using some sort of sheet metal for the top leaf - less likely to snap off than styrene.
You can use brass sheet for the leaf packs, but it is a lot of tedious work to get right.
Seeing this really clarified the concept to me during the build:
Not the same truck, but a very similar rear end:
If you decide to try this, please post it! would be fun to see!
Welcome to the forum!
Cheers
Nick
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Love a great pair of leaf springs. Your’s are the best!
The Germans had something similar that was occasionally used on the Opel Blitz. It employed internal driveshafts rather than gears or chains.
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Everyone:
Thank you for welcoming me to the forums and commenting on my WIPs; it’s an enjoyable hobby I don’t get to spend as much time as I’d like these days. The self-destructive habit of chasing squirrels as they enter my FOV inhibits me from staying focused on a single task for long.
I didn’t expect a reply so soon. Your time, photos, and the info you provided are much appreciated. Apologies for the delay in responding; work, life, and all things in between are colliding.
Nick:
I can say this for probably every photo you’ve posted, but that fully assembled front axle is something else. I’m reminded of a BigFoot (?) 1/25 monster truck kit somewhere in the basement that might lend an axle or two for this build, but if not, I can probably find something more accurate in STL format online. I have used aluminum soda cans for leaf springs before, but not to the detail you have - I love the finishing touch you put into the top plate. Generally speaking, the more individual components and details, the longer a model demands my attention. This is also why I strive to build models with what I consider hot-swappable components, even bodies. My 49’ Merc War Rig is built so that I can easily remove the body from the frame so that I can later drop on something completely different.
I won’t post any more of my builds in this thread, but when I get some time I will share my progress in a new thread.
Since it’s Scammell-related, I will add that there are a few 3D models available for free (1/76 scale, extremely simplistic), and more detailed models I’ve seen priced up to $180. I won’t link to them here as I’m not sure of the rules, but a Google search for “Scammell CAD 3D model” or some such variant will get you there. I was extremely disappointed with what I could see of the tandem axle in those very expensive models. There is a model titled “Scammell Pioneer” on 3dexport.com for under $10 that I might purchase just out of curiosity. It looks reasonably detailed, save for the drivetrain, but the tandem looks ‘fair’. It also appears to have a reasonably accurate two-link front axle bracket. I’m still digging around for other options.
There is a dedicated Buy, Sell, Trade forum:
if/when You are selling, trading or buying.
Simply linking to a site where someone ELSE is selling is perfectly OK
as long as it is on topic. Linking to a paint merchant when the discussion
is all about walking beams would be Off-Topic.
In this case it would be totally OK to link to those 3D-models
(it is on-topic and useful information for others interested in walking beams)
What I’ve always enjoyed about your builds is that you’ll go back and fix something you don’t like rather than “calling it good.”
Nice work!
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