[TheForge] bar twisters

[lama]

Saint Phlip has the right idea, go do it.
I have done it hundreds of times and
(using a square, octagon, etc. not a bundle or an angle iron)
the center of the piece remains the same and doesn't twist.
In my case where I am applying liner pressure and heat, the
work piece gets longer, not shorter. But that's just me,
y'all need to do your own.
I don't use water to cool the piece. I have found that as long
as the area getting heated is a little hotter than anything else,
it will twist in the hot spot.
dave m



> > I'm not convinced:~)
> >
> > You may only be stretching the extremities, and the centroid shall not
> > change, no matter how many revolutions.
> > Sounds like a good place for a test piece. But can we measure that small
a
> > shrinkage?
> >
> > dan tull
>
> Well, why not try it and find out, rather than theorizing endlessly? For
our
> purposes, if we can't measure a difference, there IS no useful difference.
> While a micron or two might be important in machining or serious science,
it
> just doesn't apply to most of our usual activities- whonking that iron or
> steel into an attractive shape.
>
> Saint Phlip,
> CoDoLDS
>