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Posted by rsss on March 4, 2008, 1:05 pm
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Peter Fairbrother Wrote:
> ellis wrote:
> >> John Stevenson wrote:
> >>> On Sun, 02 Mar 2008 23:29:38 +0000, Peter Fairbrother
> >>>> Any hints, tips, tricks or links for thinning tube, by spinning
> or
> >>>> otherwise, to about 1/6th of it's diameter?
> >>>> (inconel 718 seamless tube, ~ 1/2" od, thin walled)
> >>>> Thanks,
> >>>> Peter Fairbrother
> >>> Buy it 1/6 smaller than what you have
> >> Ah ha!
> >>
> >> What I actually want to do is make a neck in the tube, ie make a
> short
> >> part of the tube much thinner, perhaps in the lathe using some type
> of
> >> round-nose pliers and lots of grease to squeeze it down, while the
> rest
> >> of the tube remains the original diameter.
> >>
> >> Any hints, etc?
> >>
> >> -- Peter F
> >
> > Peter
> >
> > I am not sure that I understand - do you need a thinner wall
> thickness
> > or a
> > reduced o.d.? If it is a reduced o.d. consider: the following
> >
> > How long is the piece you want to neck? If it is only a few inches
> > long you "might'
> > be able to do it in a press as rifle cartridges are necked. Several
> > sets of dies and
> > lots of annealing will be needed. If that doesn't work there is
> always
> > rotary swaging
> > but that isn't normal workshop kit, and I have no idea who would do
> it
> > in the UK.
>
> Reduced OD, from about 1/2 " to about 1/10 ".
>
> As it's inconel, and the reduction is large, I'd guess rotary swaging
> is
> what's needed.
>
>
> Thanks,
>
>
> -- Peter Fairbrother
A possibility if you have a solid bar would be to use EDM as a two part
operation. A simple die sinker ought to work, with one shape turned to
the external and the other to the internal. (I did something similar on
steel, just to see if it would work, using a local college machine)
You might want to drill a hole previously so that you can improve the
flow of dielectric to the internal shape.
Machining the electrode (graphite / aluminium / copper) should be a lot
less difficult than machining the Inconel!
--
rsss
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> try that- I suppose it depends on the material and its thicknesss.
>
> --
> Nourish
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