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Author Topic: 3D Anchor-mounted Tank Wagons  (Read 1577 times)

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Offline maridunian

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3D Anchor-mounted Tank Wagons
« on: November 01, 2019, 02:36:03 PM »
The evolution of tank wagon design has basically been about attaching a tank to a chassis in such a way that the violent movement of tons of often volatile or noxious liquid doesn't either rip the tank apart, or the tank from the chassis during collisions, running or even rough shunting. Ironically, the problem is worse with part loads than full.

Anchor mounted tank wagons were introduced in 1942. The design took advantage of improvements in welding to simplify the attachment of a tank to a wagon chassis without the need for end frames, steel ropes or bracing rods. The design was still being produced into the 1960's.


National Benzole 14T Class B Tank Wagon No. 2002, built 1952, finished in Class A livery. Gwili Railway 1998.



National Benzole 14T Class B Tank Wagon No. 2009, built 1952. Gwili Railway 2018


Three designs dominated this type of wagon:
  • 14 ton Class A  (for liquids inflammable below 22'C)
  • 14 ton Class B (for liquids inflammable above 22'C)
  • 20 ton Class B

All 3 designs were initially mounted on a standard 17 foot 6 inch, 10 foot wheelbase steel chassis. Later 20 ton examples, including some chemical ferry wagons, used a 12 foot or longer wheelbase chassis and Scottish Oil, part of BP, mounted some 14 ton Class A tanks on older 9 foot wheelbase steel chasses.

Examples of these wagons can be viewed on Paul Bartlett's Wagon site.

Bachmann launched a range of OO anchor mounted tanks in 2015, but no sign of any in N Gauge as yet.

Although I scratch built one many years ago I wanted to add several of these to my little-mentioned tank wagon collection, so started pottering with 3D designs.



I'm aiming for a plug-and-play fit for the Peco NR-121 10' WB steel-type chassis kits, hence the gubbins below deck level.

I've ordered some test prints of all 3 designs, and when they're checked and tweaked I'll make these models available from Shapeways.

Mike
« Last Edit: November 29, 2019, 08:13:16 AM by maridunian »
My layout: Mwynwr Tryciau Colliery, the Many Tricks Mine.

My 3D Modelshop: Maridunian's Models

Offline maridunian

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Re: 3D Anchor-mounted Tank Wagons
« Reply #1 on: November 05, 2019, 03:59:28 PM »
There's always a buzz of anticipation as the Shapeways parcel's due to be dropped off. Has it worked? Will they fit? Have they printed but reveal poor design failings?



Well, almost all in one piece - one tank-end has detached itself in transit. I made the connecting sprues thin to make separation easy.



I printed these in Black Natural Versatile Plastic. It's about half the price of Fine Detail Plastic and there were several aspects of these models where I was winging it so needed drafts to check dimensions. It struggles with fine details and has a rough, porous surface. It can be finished well with several coats of primer and rubbings down, but I prefer Smoothest Fine Detail Plastic for my 'production' models.

Here they are, fitted onto a Peco 10 foot wheelbase, steel-type chassis:

14T Class A


14T Class B


20T Class B (Yes, the tanks did overhang the headstocks slightly)


A few things to fettle and then I'll make these live on Shapeways. I probably won't offer Natural Versatile Plastic as the results were poorer than I was expecting based on previous, larger models.

Mike



« Last Edit: November 05, 2019, 06:55:24 PM by maridunian »
My layout: Mwynwr Tryciau Colliery, the Many Tricks Mine.

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Offline njee20

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Re: 3D Anchor-mounted Tank Wagons
« Reply #2 on: November 05, 2019, 04:31:54 PM »
You're surely a prime candidate for a DLP printer at home, the designs look good and that'd give a better finish.

Offline maridunian

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Re: 3D Anchor-mounted Tank Wagons
« Reply #3 on: November 05, 2019, 11:32:37 PM »
You're surely a prime candidate for a DLP printer at home, the designs look good and that'd give a better finish.

Weeeellll, yes, but no, but...

I really didn't intend to make as many models as I have. Even so, I reckon my total outlay has been under 200 and I've ended up with around 15 (initially) unique models. Lots of screen time, but garage time has been restricted to painting. Nothing to break down, wander out of calibration or wear out. I think I'm ahead on points but will see how many more models I'm moved to make. I might relent but so far, pay-as-you go feels right for me.

Mike
« Last Edit: November 05, 2019, 11:35:45 PM by maridunian »
My layout: Mwynwr Tryciau Colliery, the Many Tricks Mine.

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Offline Paddy

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Re: 3D Anchor-mounted Tank Wagons
« Reply #4 on: November 06, 2019, 09:09:39 AM »
Hi @maridunian

These look very promising.  Very interested to see the final versions.

Kind regards

Paddy
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Offline maridunian

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Re: 3D Anchor-mounted Tank Wagons
« Reply #5 on: November 06, 2019, 09:17:39 AM »
Hi @maridunian

These look very promising.  Very interested to see the final versions.

Kind regards

Paddy

Thanks Paddy. I'm just working through the tweaks I identified on these drafts and will offer the final versions once ready. The Class A is now available, the rest should be later today, including some multiples when it's more cost effective.

Mike
My layout: Mwynwr Tryciau Colliery, the Many Tricks Mine.

My 3D Modelshop: Maridunian's Models

Offline maridunian

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Re: 3D Anchor-mounted Tank Wagons
« Reply #6 on: November 06, 2019, 06:24:28 PM »

Thanks Paddy. I'm just working through the tweaks I identified on these drafts and will offer the final versions once ready. The Class A is now available, the rest should be later today, including some multiples when it's more cost effective.

Mike

All three are available now . I'm offering them as pairs which work out about a third cheaper per tank than printed singly. I'll add photos of my own models here as I complete them.

Mike
« Last Edit: November 13, 2019, 09:33:02 AM by maridunian »
My layout: Mwynwr Tryciau Colliery, the Many Tricks Mine.

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Offline njee20

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Re: 3D Anchor-mounted Tank Wagons
« Reply #7 on: November 07, 2019, 09:18:38 AM »
They're very good value, Shapeways definitely seems to favour nice 'compact' shapes, I guess it's more efficient for their build volume - I uploaded one of my wagons they wanted 80 per body, I wonder if they consider each item a cube of its largest dimension.

Offline maridunian

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Re: 3D Anchor-mounted Tank Wagons
« Reply #8 on: November 07, 2019, 10:33:23 AM »
They're very good value, Shapeways definitely seems to favour nice 'compact' shapes, I guess it's more efficient for their build volume - I uploaded one of my wagons they wanted 80 per body, I wonder if they consider each item a cube of its largest dimension.

Thanks - yes, their pricing algorithm is mysterious. I was surprised that the 20T tank-pair base price is 10% higher than the 14T Class A, which is 10% higher than the Class B. The print size isn't much different, but the tanks are progressively bulkier.

FWIW I set the print orientation to vertical on these tanks so any print lines run the same direction that oil spills!

Mike
« Last Edit: November 07, 2019, 06:48:25 PM by maridunian »
My layout: Mwynwr Tryciau Colliery, the Many Tricks Mine.

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Offline maridunian

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Re: 3D Anchor-mounted Tank Wagons
« Reply #9 on: November 07, 2019, 11:03:29 AM »
I uploaded one of my wagons they wanted 80 per body...

Well, Farish seem to be selling mass-produced coaches at 40 each in sets of 2/3, so someone's obviously got deep enough pockets when it comes to special items their collection requires...

Mike
My layout: Mwynwr Tryciau Colliery, the Many Tricks Mine.

My 3D Modelshop: Maridunian's Models

Offline maridunian

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Re: 3D Anchor-mounted Tank Wagons
« Reply #10 on: November 07, 2019, 07:00:18 PM »
Well, even Versatile Plastic looks a lot better with a couple of coats of primer on, carefully rubbed down between. I'll repeat that loop once more then add top coats. Although these were test prints they're too good to throw away and on a par with many of my own scratch builds.

14T Class A on Peco 9' WB chassis with Peco equivalent for comparison:


14T Class B on Peco 10' chassis with Bachmann equivalent for comparison:


20T Class A on Peco 10' chassis with Peco conversion for comparison:



I'm planning a BP livery for the first, NCB for the second and ICI for the last.

Mike

« Last Edit: November 07, 2019, 10:39:26 PM by maridunian »
My layout: Mwynwr Tryciau Colliery, the Many Tricks Mine.

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Offline maridunian

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Re: 3D Anchor-mounted Tank Wagons
« Reply #11 on: November 09, 2019, 09:08:19 PM »
Well, the Class A is first to completion:



and into service:



As noted previously, these are test prints in Versatile Plastic and so a little lacking in fine details, but I'm very pleased with how these are turning out!

Mike

« Last Edit: November 10, 2019, 09:40:14 AM by maridunian »
My layout: Mwynwr Tryciau Colliery, the Many Tricks Mine.

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Re: 3D Anchor-mounted Tank Wagons
« Reply #12 on: November 09, 2019, 10:51:50 PM »
@maridunian , could you tell me what CAD package you use for your designs?

I've a few ideas of my own that I'd like to try and your designs seem to come together okay.

 :thankyousign:
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Offline maridunian

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Re: 3D Anchor-mounted Tank Wagons
« Reply #13 on: November 10, 2019, 07:25:08 AM »
Hi - I use TinkerCAD, an online, cut down, FREE version of AutoCAD. It includes some tutorials to get you started. I've not done any comparison with other packages - tried this first and it's been fine so far. I've not got a 3D printer either, all done through Shapeways.

Good luck!

Mike
My layout: Mwynwr Tryciau Colliery, the Many Tricks Mine.

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Offline Paddy

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Re: 3D Anchor-mounted Tank Wagons
« Reply #14 on: November 10, 2019, 10:54:00 AM »
Hi @maridunian - these are looking scarily excellent and as you say too good to throw away.  Can't wait to see that the difference is between these test prints and the finer versions from Shapeways.  In the past, I have not liked 3D printing as it always looked "rough" to me but the technology must be improving swiftly.

Very impressed.

Paddy
HOLLERTON JUNCTION (SHED 13C)
London Midland Region
http://www.ngaugeforum.co.uk/SMFN/index.php?topic=11342.0


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