[modeleng] Re: Spinning
- From: "alan stepney" <alan@xxxxxxxxxxxxxxxx>
- To: <modeleng@xxxxxxxxxxxxx>
- Date: Tue, 8 Aug 2006 19:06:03 +0100
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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