[TheForge] filling pipe with sand to bend

[Bob]

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!
>