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Miniature Traction Engine

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Nigel Taylor

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The black paint needs a mention. I needed a paint that could work at a high temperature for the chimney and the firebox.

I found this coal black paint, initially I thought this description was really describing the colour. However, this paint is designed for painting your fake coal on the gas fire....really.



I had a quick search and saw that this paint is also used for stoves, so thought I would give it a go on the chimney and firebox. I've now fired the boiler a few times and this black finish is growing on me.

So, if you need a high temperature black paint then this paint from Rapide Products is rather good and cost me just £3.99 at a small hardware store.
 

Nigel Taylor

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After making the test boiler, fitting a DRO, adding a stiffening plate and sandbag damping to the milling machine....I'm back working on the Burrell traction engine. Today I roughed out a steering wheel whilst waiting for cylinder material.


Not quite perfect, but considering it is 22mm across I'm ok, I might make another one....but for now.

I then parted it off and machined the other side. A little bit of filing, emery cloth and tumbling this afternoon.



I need to add a handle so you can turn it fast
 

Nigel Taylor

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The steering system is a worm drive of a drum that then winds the chains in and out. These chains connect to the front axle beam.

The first challenge was making a 6mm diameter 2mm pitch worm and wheel

 

Nigel Taylor

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I built up the bottom end of the steering system. The phosphor bronze bearing has a recessed section that the brass tag was rolled into and a flattened side with step that aligns on the edge. This angled edge was machined at 38.5° to align with the steering column.


I think I'm getting more confident when working with sheet metal.


The worm sits snugly into the gear wheel. There is no chance that this can jump a tooth.

The bearing at the top end is a simple brass post. The steering wheel hub was machined from brass with an 8BA thread to accept the steering wheel. The steering column works very smoothly, just need to add the chains and attach them to the front axle.



I had to reassemble the parts, I need to make the crankshaft as the flywheel is balanced on a much thinner rod at the moment, hence slightly too low.

 

Nigel Taylor

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How can lumps of metal seem pretty. But (to me) it is.
Please post a video of it running when complete.
Thanks Dave, just lots of patience to sometimes make 3 or 4 parts before you get it right. Might be sometime before it's running, but will post progress. Best regards, Nigel
 

Nigel Taylor

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Not sure if everyone else is struggling in the heat in the workshop, it's definitely slowed me down.

However, I did managed to turn and mill the crosshead guide.



The inside surface of this is the bearing for the mid-point joint in the conrod. Thus allowing the sliding seal to work on cylinder and hence enable the double-acting operation of the cylinder.
 
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