[modeleng] Re: Spinning
- From: "Terry Lane" <tel@xxxxxxxxxxx>
- To: <modeleng@xxxxxxxxxxxxx>
- Date: Wed, 9 Aug 2006 11:57:10 +1000
Just a few points for spinning petticoat pipes;
It is much easier if you make up a split chuck, with the 'negative' of your
flare cut into it.
Doesnt hurt to also support the pipe with a bit of closeish fitting dowel
inside - but not so tight that you can't get it out for the...
.... several annealings you will need.
best to make a spinning tool that will pivot around the toolpost, with at
least 8 or 10 to 1 mech advantage and the working end kept a short as
possible.
> Keith, check this link out as well :-
> http://www.aardvark.co.nz/pjet/spinning1.shtml It is primarily about
> building a lathe for metal spinning, but also gives some more general
> information on it as well. I have a couple of other links buried in my
wood
> turning favourites - somewhere! I will post them too, if and when I can
ever
> find them. One of the woodturning supply shops does sell kits for making
> such as spun metal cups for candle stick holders, so I will post that link
> too, hopefully tomorrow when I can get to the catalogues out in the shop
end
> of the garage.
>
> Tony Wells.
>
>
> ----- Original Message -----
> From: "alan stepney" <alan@xxxxxxxxxxxxxxxx>
> To: <modeleng@xxxxxxxxxxxxx>
> Sent: Tuesday, August 08, 2006 7:06 PM
> Subject: [modeleng] Re: Spinning
>
>
> > Ahhh, spinning is a technique for turning nice new pieces of metal into
> > something resembling a pretzel in a few microseconds.
> >
> > The most common use is for turning flat sheet into, say, a bowl shape,
and
> > as that may be easier to follow, ,
> >
> > Firstly, ANNEAL the metal. That is essential. Then mount it firmly in
the
> > chuck, with just the amount that is to be shaped protruding.
> > Then one needs to press against the inside with a round-ended tool
whilst
> > the lathe is turning, , so that the metal distorts, and forms into the
> > bell
> > shape. When I say "round ended", about the best is a ball from a ball
> > race,
> > soldered into the end of a piece of tube. Alternatively, well round the
> > end
> > of a piece of silver steel, and polish it well before use.
> > You can only make a small change before having to anneal the metal
again,
> > so
> > usually it takes several goes to get it to the shape you want.
> >
> > A template of the shape required is worth making to check progress.
> >
> > Spinning is an art which takes practice, and it may be best to try it on
a
> > piece of sheet first. Perhaps make a small bowl out of it. For that,
turn
> > a
> > wodden former to fit into the lathe, and screw a piece of sheet to it.
> > (copper is easiest, then brass, but most metals can be spun.)
> > Then, using the ball end, press against the sheet, working from the
inside
> > out.
> >
> >
> > Alternatives, if or when things go wrong, are to turn a piece of
hardwood
> > or
> > aluminium to the required shape and, again after annealing, hammer that
> > into
> > the end of the petticoat pipe.
> > Or, turn it from solid, doing the inside first, and then turning the
> > outside, VERY carefully.
> >
> > Alan
> > ----- Original Message -----
> > From: <Gmx22@xxxxxxx>
> > To: <modeleng@xxxxxxxxxxxxx>
> > Sent: Tuesday, August 08, 2006 8:28 AM
> > Subject: [modeleng] Spinning
> >
> >
> > HI ALL, Simplex is well on the way but have no idea what spinning is.
> > It refers to the petticoat pipe "bell the end out by spinning" im sure
> > that
> > you all know what this means but i have not got a clue! Any help Please
> > Keith
>
>
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