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London & Greenwich Railway - Royal William Pt. 2


5&9Models

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Royal William - Pt. 2

 


Having made a bit more progress over the last few evenings, here is a little more about the loco itself.

 

The image below shows the mainframes with firebox and flimsy inner frames (more trunk guides than frames). The firebox and frames will be detachable from each other in order to remove wheels in the future, although I can't image a scenario where I would want to do that. The boiler and smokebox are also detachable in order to extract the motor if needs be.

 

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The little motor and spur gearbox with coarse Romford worm fits inside the boiler and the two springs should make contact with a piece of PCB sleeper glued inside the smokebox, seen to the right of the image. From this, two insulated copper wires (courtesy of a friend who works for BT Openreach) protrude between the trunk guides and will be cunningly disguised as piston rods. These will connect to a pair of sprung plunger pick-ups tucked under the firebox in contact with the back of the driving wheel tyres - thus motion will be achieved (we hope)!

 

It's all very Heath Robinson but the loco has so far cost less than a tenner.....!

 

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The added photo above shows the boiler scribing process. The brass tube is supported in a vee block which prevents it shifting and a hard point engineers scribe is used to mark the planks against a straight edge, held parallel to the edge of the vee block. Boiler bands are added afterwards.

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  • RMweb Gold

Very clever, and a neat use of those tiny motors. What are you going to secure it with?

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The motor is a tight sliding fit. There are two flats soldered inside the boiler to prevent rotation, and two end stops at the smokebox end which hold it firmly in place. Because the boiler separates from it all you can just push the motor out with a pencil.

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Hi Chris.

Thanks for showing how you've designed the loco to breakdown into sections.

All very clever and good ideas that can be borrowed.

Question 1 - do you have a special technique for 'grooving' the boiler? 

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Thanks Boston Lodge,

The boiler is grooved using a hard sharp engineers scribe. The brass tube is laid in a vee block which is essential to hold it steady and give a parallel edge to work to. Otherwise the lines can go awry very easily and the eye picks it up!

I'll take a photo and it it to the post tomorrow.

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