[TheForge] filling pipe with sand to bend

[Garrick Peterson]

I've seen the method outlined by Bob above quite a bit in relation to
musical instruments. I believe they also use frozen soapy water to similar
effect.

I've also watched them re-shape a bent pipe using a ball bearing with an
outer diameter equal to that of the desired inner diameter & smaller ball
bearings to push it through, but it seems like that also requires very
accurate forms.


On Wed, Nov 7, 2012 at 8:14 AM, Bob <blcksmth at wcnet.org> wrote:

> In one of the Lindsay books I have on marine copper work they describe a
> method for bending pipe. The pipe was filled with melted rosin that was
> allowed to cool. After the pipe was bent the rosin was heated and melted
> out.
>
> Bob Willman
> The Eagle’s Anvil
> Bowling Green, Ohio
> WB8NQW
>
> And can the liberties of a nation be thought secure when
> we have removed their only firm basis, a conviction in the
> minds of the people that these liberties are of the gift of God?
> That they are not to be violated but with His wrath? Indeed I
> tremble for my country when I reflect that God is just; that His
> justice cannot sleep forever.
>
> Thomas Jefferson
>
> On 11/6/2012 10:35 AM, Andy Gladish wrote:
> > Has anyone out there tried this?
> > I've got a curved schedule 10 1 1/4" nominal railing that needs a
> > transition piece between two sections- this will be a curve that changes
> > direction by 15 deg. in about 11". (that's a 42" radius)
> >
> > I'd have to bend it around a form or make some wooden dies and use a
> press,
> > but if it's hot it seems like it would distort unless the dies are shaped
> > just right.
> >
> > I'm worried about distortion if I roll it cold OR hot....
> >
> > Then after it's done it needs to get to a brushed finish- will muriatic
> > acid do that, or is it better to try to do it cold so there's less
> cleanup?
> > Or perhaps I can just grind and sand it clean?
> >
> > Thanks for any ideas!
> >
>
>
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