johnsmachines

machines which I have made, am making, or intend to make, and some other stuff. If you find this site interesting, please leave a comment.

Category: Boiler for Bolton 7 Steam Engine

BOILER PAINT

I am waiting for some new 2mm milling cutters to arrive before I tackle the steam passages in the triple, so I decided to apply some finishing touches to the Bolton 7 boiler.

The aluminium castings on the ends were removed, and painted with a high temperature engine paint.  While the boiler was in pieces I connected the steam exhaust pipe from the engine to the boiler chimney.

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The before shot. The engine and its boiler are sitting on a mantelpiece in our living room.

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It looks better with the ends painted matt black, yes? I suppose that I should have also painted the brass sides and copper boiler, but I really like those metal colours. 

Boiler for steam engine

Just a bit more finishing on this boiler.
At the chimney end there is now a removable cover to provide access to the smoke box (the round aluminium cover with the brass lever nut), and a sliding door to provide access to the firebox.
You can just see the Bolton 7 engine behind the boiler. They are both sitting on a marble shelf above the fireplace in our living room. I was amazed when SWMBO said that it could live there.
My 18 month old grandson loves to be lifted up to the “teamengine” so he can turn the flywheel.

Making a copper boiler

The boiler which powers the Bolton 7 steam engine is 250x100mm. The case is 1.6mm thick and the ends are 3mm thick. It has 7 x 6mm copper stays. The safety valve, pressure gauge, sight glass and valves were bought items. It operates at 60 psi but has been tested to 120 psi. Propane gas fuel.

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