[modeleng] Re: Brass dome cover for Tinkerbell
- From: "Barrie Purslow" <bpduo@xxxxxxxxxxxxx>
- To: <modeleng@xxxxxxxxxxxxx>
- Date: Tue, 8 Nov 2005 12:16:07 -0000
Hello Peter,
I 've made a steam dome cover for a 5" Britannia. It is much smaller and
shallower than your dome but I made it in one piece by metal spinning. It
was remarkably easy and the end result was, and still is first class. I used
Guilding Metal which is sort of half way between copper and brass. The only
real problem I had was that the tool I used to form the shape tended to
groove the job as the hardwood was too soft. This was easily solved by
soaking the former in resin, annealing the guilding metal and starting
again. I would certainly make the hemisphere by spinning a circular sheet of
metal.
The flare to match the boiler barrel was done by putting a flare onto the
spun item then gently tapping the sides down over a cylindrical former. The
only trick is to take it easy and anneal the job as soon as it starts
springing back.
Barrie
----- Original Message -----
From: "Peter Beevers" <peter@xxxxxxxxxxxxxx>
To: <modeleng@xxxxxxxxxxxxx>
Sent: Tuesday, November 08, 2005 7:52 AM
Subject: [modeleng] Brass dome cover for Tinkerbell
> I am seriously considering making a brass dome cover for a 7.25" gauge
> tinkerbell that I help maintain. The cover is 10" diameter, 12" high,
> boiler
> is 14" diameter, and it has a 4" hole in the top for the safety valves to
> exit through.
> Now, I have never done any sheet brasswork, so experienced help/advice is
> most welcome.
> In my simple mind, I can see two ways of achieving this:
> 1) Make a 10" diameter cylinder (silver soldered seam), then spin a
> hemisphere for the top and silver solder it on, or
> 2) Make a longer cylinder, then spin the end inwards (no need to join up
> due
> to the safety valve exit hole)
> Either of these, however, involve the black art of brass spinning, over a
> very large former, also silver soldering thin brass (with the attendant
> warping problems ???). I also have no idea how to swage the open end out
> overthe boiler.
>
> Does anyone:
> 1) Have a better way of achieving this ?, or
> 2) Have any hints as to how I could make this job easier ??
>
> Any help, advice etc. greatfully received,
>
> Peter
>
>
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