Roger Marsh Ogwen Locomotive sm32 16mm

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alan2525

Roger Marsh Ogwen Locomotive sm32 16mm

Post by alan2525 » Fri Aug 08, 2008 4:27 pm

Here's some pics of my Ogwen Locomotive I recently purchased from Ebay. It's now it bits, it's the custom here to take a new loco apart and spread the bits around the kitchen as soon as it's delivered!

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Here's the Loco prior to disassembly and repainting! The loco was in good condition however there was some burning to the paint on one of the side tanks and a bit of paint damage where the nameplate had come off and taken the paint with it. I was reluctant to repaint but it really will benefit from it!

At least I now know how it works now!

Valve Gear
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This is a shot of the valve gear on the loco, cylinders are piston valve, rather than slide valve and the valvegear is eccentric but dressed up to look a bit like walsherts. What I do like about this loco is the simplicity of the various rods, they are all flat and stamped out of sheet, various brass spacers are used to give clearance. Unfortunately all of the rods are pinned together with the end flattened off to secure them. There are only a couple of bolts on each side so it's not deigned to be removed for maintaining the cylinders replacing parts etc.

Reversing Valve
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Reversing is achieved by means of a reversing valve as per mamod. The difference here is the position and orieientation of the valve. It's controlled by a servo, a long linkage runs the entire length along the underside of the loco.

Gas Burner
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Here's the gas burner, those slots are quite wide and there's a lot of them which must add up to quite a large area! I think I'll wrap some copper mesh around the burner to help to even out the heat. As the burner is quite large it's easy to turn the gas up too high! I'll think about fitting a secondary fine regulator on the gas so I can just use the valve on the burner for turning it on and off. There's a little sleeve over the tube, like on a bunsen burner for regulating the heat of the burner too.

Gas Tank
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This is the gas tank, it's pretty large and has some nicely pressed ends, I like the way they are domed on the ends.

More pictures to follow!

ACLR

Post by ACLR » Fri Aug 08, 2008 10:29 pm

thats a nice Loco Alan :D
its interesting to see how diferent manufactures build their engines

alan2525

Post by alan2525 » Fri Aug 08, 2008 11:06 pm

The Roger Marsh Ogwen seems to be one of the first off the shelf proper 16mm Garden Railway Loco's. One reason for purchasing a used loco is that I can take it apart and get more of a feel for how they go together.

I'm scratch building my own loco and have a few projects in my mind, I like the simplicity of this loco, it's quite cleverly designed, gives a good representation of the actual loco with the minimum amount of parts and sheet metal.

At a later date i'd like to draw up my own valvegear for a loco too, and get the parts laser cut. The fact that all the rods on this loco are just cut from flat sheet would be a good basis for my own design.

If I could build something around off the shelf cylinders, and minimise the amount of complex machining for the cranks etc, all the better!

ACLR

Post by ACLR » Fri Aug 08, 2008 11:11 pm

sounds like a great project Alan look forward to hearing how it goes :D

SillyBilly

Post by SillyBilly » Sat Aug 09, 2008 3:02 pm

Very interesting to see what these locos are really like. I fancy making one in to Elidir, not hard but suitably pleasing.

alan2525

Post by alan2525 » Sun Aug 10, 2008 1:56 pm

I'm doing some work on the tender of this loco, I wanted to make a hinged fall plate between the tender and loco and also do something with the coupling between the two. At present it just has a little wire hook and loop. I wanted something a bit more prototypical. But what sort of coupling would have been used? It'd need a fair bit of articulation and allow for some lateral movement too?

I was thinking of some kind of pin and draw bar arrangement, but what would a real loco have?

alan2525

Post by alan2525 » Sun Aug 10, 2008 2:18 pm

I've made new buffer beams for the tender, to match those fitted to the loco. I've also removed the diecast coupling and moulded in rivet detail, raised the coupling height. Highest I could fit gives me a height of 22mm to the rail head. Couplings are the machined steel type from Brandbright. These are great quality - I need to get some of the sprung type too for my other locos!

I really dislike the use of white metal castings for buffers on 16mm locomotives as they seem to make quite a focal point on a loco. The observant of you will notice the Mamod Wagon chassis underneath the tender! :lol:

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steamyjim
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Post by steamyjim » Sun Aug 10, 2008 2:41 pm

Where did that pump come from mate? I'm quite tempted to make my own ;)

alan2525

Post by alan2525 » Sun Aug 10, 2008 2:54 pm

steamyjim wrote:Where did that pump come from mate? I'm quite tempted to make my own ;)
I bought mine from:

http://www.maccmodels.co.uk/steamfittings.htm

steamyjim
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Post by steamyjim » Sun Aug 10, 2008 3:25 pm

alan2525 wrote:
steamyjim wrote:Where did that pump come from mate? I'm quite tempted to make my own ;)
I bought mine from:

http://www.maccmodels.co.uk/steamfittings.htm
Thats rather expensive...i may attempt to make my own :shock:

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