Author Topic: Another steam thread  (Read 4479 times)

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garethashenden

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Another steam thread
« on: October 30, 2013, 06:58:25 PM »
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I thought some of you might be interested in another way of building steam locomotives. Strictly speaking, this isn't N scale, it's 2mm finescale. This was mentioned briefly in the European model thread.
The 2mm Association http://www.2mm.org.uk/ provide etched replacement chassis to convert commercial N gauge models to 2mm. This is one of those and my first 2mm locomotive.

This is a Jinty 0-6-0 tank engine build by the LMS in the 1920s. I chose this because I had the body for it already and it is appropriate for my club's 2mm layout.
The standard method for 2mm is a split chassis meaning that both frames are live with an insulating material in between.
So the chassis arrives as an etch in nickel silver. I didn't think to take a picture. The first step is to solder the bearing into the etch. During this step the gearbox gets folded up and soldered as well.

The insulation between the frames is copperclad pcb. This is easy to solder but can then be gaped to insulate the frames. Three pieces are needed, one at each end and one in the middle. There are tabs on the etch which mark the location of the pcb

Included on the etch was a helpful box which holds the frames at the right spacing and lines up the axles. Here the frames, pcb and temporary axle can be seen.

And the chassis once the two frames were joined together.

This is called 2mm finescale for a reason. Here is a driving wheel alongside a BLMA truck. The tread is similar but the flange is tiny.

The gears are mounted on a sort of plastic tube called a muff. It is a tight fit for both the gear and the axle. Here are the two gear axles. The one with only one gear will carry the middle set of driving wheels.

Here is the chassis with a set of gears installed. The gaped pcb can be seen as well.

The connecting rods are quite cleverly designed. They start on the etch in 5 separate parts.

There are then two folds which form the rods and strengthen the bearings. This is all soldered together.

The non powered axles are pressed into plain muffs and the center powered axle is pressed into the muff with the single gear.

One of the center wheels isn't in gauge yet.

This hasn't taken very long to do. Maybe 8 hours? Possibly less. All of this has happened today. Tomorrow will consist of quartering, mounting the motor, painting, etc.

Chris333

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Re: Another steam thread
« Reply #1 on: October 30, 2013, 07:01:10 PM »
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Cool!  The more steam the better  :lol:

Keep snapping pics, even with not descriptions they are worth seeing.

sizemore

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Re: Another steam thread
« Reply #2 on: October 30, 2013, 11:32:19 PM »
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IIRC, there are some American steam brass pieces made this way. While not etched, they are two cast frame rails. I want to say its the piece I'm thinking of is a K4 PRR Pacific.

Pretty cool the Brits are doing it from scratch. The fine scale stuff over there is pretty amazing.

The S.

superturbine

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Re: Another steam thread
« Reply #3 on: October 30, 2013, 11:42:17 PM »
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Thanks for sharing and keep it coming. Can you post a picture of the prototype?

 On a side note....I know Max will be very happy to see the jar of Flux!! 

We are foaming for the steam!!

mmagliaro

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Re: Another steam thread
« Reply #4 on: October 31, 2013, 12:04:23 AM »
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Some of us might be interested???

I SURE AM!  Thanks for posting this.

I have a question (that's the way it works around here... we love to see building projects,
but we also love to ask questions  :) )

Those bearings... you say they are soldered into the frames?  So the bearings are rigid in the frames and do not
slide or float in there?   How does that work for keeping the 6 driving wheels (in this case)
able to sit on uneven track?

Keep posting.  I will be very interested in watching this go together.


Yay, flux!


garethashenden

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Re: Another steam thread
« Reply #5 on: October 31, 2013, 03:32:26 AM »
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Thanks guys.
The flux helps but the secret to success if really this stuff. https://www.eileensemporium.com/index.php?page=shop.product_details&flypage=eny_fly_default.tpl&product_id=3564&category_id=124&option=com_virtuemart&Itemid=9

Here is the Wikipedia article on the prototype. http://en.wikipedia.org/wiki/LMS_Fowler_Class_3F

The bearings are rigid. Some people enlarge the bearing slightly. It is a 1.5mm hole originally, it can be enlarged up to say 1.6mm or so. This one is being built rigid as the track it will run on is good enough.
There has been lots written over the years about locomotive compensation. It isn't too common in this scale but very necessary in larger ones. Have a look here: http://www.2mm.org.uk/articles/new_comp_article/index.htm

Chris333

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Re: Another steam thread
« Reply #6 on: October 31, 2013, 03:49:15 AM »
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I like the PC board as spacers.

Here is some smaller scale compensation:
http://hon2jeff.blogspot.com/


garethashenden

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Re: Another steam thread
« Reply #7 on: October 31, 2013, 03:59:11 AM »
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Oh it's definitely possible to do it. I'm just not doing it on this model. Maybe the next one.

peteski

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Re: Another steam thread
« Reply #8 on: October 31, 2013, 04:22:04 AM »
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Here is the Wikipedia article on the prototype. http://en.wikipedia.org/wiki/LMS_Fowler_Class_3F


I'm no expert on British prototypes but that loco to me looks similar to the N scale Terrier locomotive from Dapol I picked up few years ago.

Nice job on the Jinty!   :D
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Cajonpassfan

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Re: Another steam thread
« Reply #9 on: October 31, 2013, 10:53:14 AM »
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Thanks guys.
The flux helps but the secret to success if really this stuff. https://www.eileensemporium.com/index.php?page=shop.product_details&flypage=eny_fly_default.tpl&product_id=3564&category_id=124&option=com_virtuemart&Itemid=9

Okay, I'll bite: what's the secret involving solder paint?
Beautiful work so far, keep 'me coming!
Regards, Otto K.

Cajonpassfan

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Re: Another steam thread
« Reply #10 on: October 31, 2013, 10:56:38 AM »
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Umm, damn auto speller, that was supposed to say "keep 'em coming" , as in the pictures  :facepalm:
Otto K.

VonRyan

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Re: Another steam thread
« Reply #11 on: October 31, 2013, 12:09:36 PM »
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I've always loved the way some of the 2mmFS stuff folds together and gets soldered.
I'd love to find some etched kits of GWR wagons other than the types than what's being mass produced by GF, Peco, and Dapol, but it seems that a lot of those etched kit makers don't have an online presence.

Now if someone makes a kit for a GWR City class... Well then I might just have to get one and modify it to run on 9mm gauge.  :D


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TrainCat2

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Re: Another steam thread
« Reply #12 on: October 31, 2013, 12:49:37 PM »
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Umm, damn auto speller, that was supposed to say "keep 'em coming" , as in the pictures  :facepalm:
Otto K.
http://www.damnyouautocorrect.com/  BTDT!
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TrainCat2

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Re: Another steam thread
« Reply #13 on: October 31, 2013, 12:57:18 PM »
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Okay, I'll bite: what's the secret involving solder paint?

Solder Paint is a liquid flux that has a suspension of super finely ground lead particles in it. Although you have to keep mixing it before each application, you basically paint it on, heat and bond the items together. I use quite a lot. When I get home tonite, I will post a pic of the type I use for those in the states that would like to try it. It is pretty cheap at < $20US for the container.


Edited By: ME, fixed fat finger mistake
« Last Edit: October 31, 2013, 02:15:36 PM by TrainCat2 »
Regards
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VonRyan

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Re: Another steam thread
« Reply #14 on: October 31, 2013, 01:37:08 PM »
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Bob, did you mean " < $20 per container " or " ~ $20 per container ", or is it actually greater than $20?


-Cody F.
Cody W Fisher - Modeler of the PRR, PRSL, GWR, SZD, and DRG

WWII Clerk/Administration Historian

Switchboard Technician - 33rd Signal Construction Battalion (reenacted)

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