Mainly 3D Printed LNER Locomotives in N gauge

Have any questions or tips and advice on how to build those bits that don't come ready made.
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mattmay05
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Re: Mainly 3D Printed LNER Locomotives in N gauge

Postby mattmay05 » Thu May 03, 2018 10:58 am

Thought I recognised them... or there was an imposter called Steve who has exactly the same models lol A very insightful article :) great read.

Atso
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Re: Mainly 3D Printed LNER Locomotives in N gauge

Postby Atso » Thu May 03, 2018 1:21 pm

Thanks Matt. That was the second article I'd written for BRM on the subject. I've never written anything for a publication before these two articles and was really nervous about seeing them in print - If Tony Wright and Andy McVittie hadn't asked and been so encouraging, I never would have. I'm glad you enjoyed reading it. :D
Steve

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Re: Mainly 3D Printed LNER Locomotives in N gauge

Postby Atso » Fri Jul 06, 2018 12:55 pm

Some time ago I designed a body tub for an LNER A5/2. However, I've been struggling to find a suitable chassis with the correct 6'6 by 6'6 wheelbase. I recently rediscovered a load of old Farish chassis blocks and was wondering if I could adapt one to work for the A5/2. I printed up a jig to hold the chassis parts (to be honest, I could've knocked this up out of plastic) and proceeded to cut two 2.5mm sections out of the chassis between the axle holes. Following some cleaning up with files and sanding sticks, I put some Araldite onto the mating faces and placed the three sections onto the jig. After about an hour, I removed the chassis from the jig and placed it on the flattest surface I could find to check for any rocking and adjust as needed.

This is the result of my efforts so far.

Image

I'll be making up another jig to cut and shut some coupling rods; using solder for these. Once, I've done that I'll try and fit a 0.2MOD 40 tooth gear to a set of spare 4MT wheels I have and use a Nigel Lawton 8mm motor to power the contraption. Heaven only knows if it works but it's not cost me very much to have a try!
Steve

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TimberSurf
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Re: Mainly 3D Printed LNER Locomotives in N gauge

Postby TimberSurf » Fri Jul 06, 2018 1:18 pm

Man your brave!
Good job we are not in the car business! You would get a bad rep if you were!
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Re: Mainly 3D Printed LNER Locomotives in N gauge

Postby Atso » Fri Jul 06, 2018 9:16 pm

TimberSurf wrote:Man your brave!
Good job we are not in the car business! You would get a bad rep if you were!


I'm not sure if I'm brave or just plain stupid sometimes! I'm not in the car business, not looking to sell the chassis and haven't hidden the fact that I've cut and shut it so hopefully my reputation (for being plain stupid!) is secure!

A bit more progress on this.

Image

Amazingly having chopped up and reassembled the coupling rods, the Heath Robinson contraption rolls very freely first time! I've added some strengthening plates out of 0.25mm nickel silver to the sides which I'll cut back once the epoxy has hardened.
Steve

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TimberSurf
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Re: Mainly 3D Printed LNER Locomotives in N gauge

Postby TimberSurf » Fri Jul 06, 2018 10:07 pm

I would never call you stupid! Quite the opposite! I think the side plates is a brilliant idea, that guarantees little likelihood of failure of the main joints and relieves the stresses on them, sound engineering. :)
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Atso
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Re: Mainly 3D Printed LNER Locomotives in N gauge

Postby Atso » Fri Jul 06, 2018 10:27 pm

TimberSurf wrote:I would never call you stupid! Quite the opposite! I think the side plates is a brilliant idea, that guarantees little likelihood of failure of the main joints and relieves the stresses on them, sound engineering. :)


Thanks TimberSurf,

However, I cannot claim credit for the ideas as they are heavily based on the work done by Graeme King when he converted a Bachmann OO guage A1 into an A2 (BRM September 2007 - long before the A2 was available rtr). I am luckily that I have been able to tap Mr King's knowledge directly for this project - see I'm stupid really! :lol: :lol: :lol:
Steve

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Re: Mainly 3D Printed LNER Locomotives in N gauge

Postby Bufferstop » Fri Jul 06, 2018 11:31 pm

Hi Atso, have you contemplated 3D printing a chassis block, you could add metal plate side frames to it. If you were concerned about the weight leave some cavities which could be filled with fine lead shot (Fluid Lead) or "Liquid Gravity" which isn't lead, but just as heavy.
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Re: Mainly 3D Printed LNER Locomotives in N gauge

Postby TimberSurf » Fri Jul 06, 2018 11:54 pm

Industry is now printing stainless steel, aluminium, titanium, etc, I guess it might be too expensive for us modellors, but have shapeways etc started offering suitable metals yet?
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Re: Mainly 3D Printed LNER Locomotives in N gauge

Postby Atso » Fri Jul 06, 2018 11:57 pm

Bufferstop wrote:Hi Atso, have you contemplated 3D printing a chassis block, you could add metal plate side frames to it. If you were concerned about the weight leave some cavities which could be filled with fine lead shot (Fluid Lead) or "Liquid Gravity" which isn't lead, but just as heavy.


I have though about this but at the moment I'm looking to use up various spares that I already have (as I'm presently cash strapped). I also like the Farish reduction gearbox in their 3MT and plan to make use of this chassis as I bought several locos a few years ago very cheaply due to the domes being attached the wrong way around!

Gears and wheels are the biggest stumbling blocks really but I'm concerned about how a 3D print will wear. I know it's been done successfully in 4mm and 7mm scales but these are fitted with bearings; a size suitable for use with N gauge wheels has proven difficult to source. When I explore this route in a bit more detail, I think I'll use the print as a casting master and cast using bearing metal (a variant on white metal). It might prove easier just to etch everything as the coupling rods will need to be done this way.
Steve

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Re: Mainly 3D Printed LNER Locomotives in N gauge

Postby Atso » Fri Jul 06, 2018 11:59 pm

TimberSurf wrote:Industry is now printing stainless steel, aluminium, titanium, etc, I guess it might be too expensive for us modellors, but have shapeways etc started offering suitable metals yet?


Shapeways do offer various metals. Their stainless steel and aluminium isn't accurate enough - their brass shows promise but is expensive.
Steve


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