i have hollow tube i need to bend to make round bangles...
It’s really pretty easy Nathalie. There are a few ways to do it,
I’ll give a couple of suggestions. With any of them you’ll want to
anneal your tube first. And you’ll need a dowel or mandrel that is
slightly smaller in diameter than your finished bangle. The tube
will need to be 2.5 to 3 inches longer to allow for the ends that
won’t make the curve perfectly.
I think the easiest way is to clamp you “dowel” in a vise vertically.
Then clamp the end of the tube onto the dowel with a vise grip so it
is perpendicular to the dowel. Set the edge of the vise grip so it
flush with the edge of the tube on the side you intend to coil
(usually the up side) so you can coil tightly. Then using your hands,
coil the tube around the dowel while being careful to apply even and
continuous pressure, close to the dowel, so you don’t create a kink.
You should be able to coil it around the dowel fairly tightly except
for the last little bit. When you’re finished it will spring open a
little bit, that’s why you need to dowel to be smaller than the
finished diameter. Release the clamp, check your diameter, pull it up
a mandrel if too small, and cut it like you’re making a giant jump
An alternative is to pinch one end shut and fill the tube with fine
salt, then stuff the other end with wax. The idea is to help prevent
denting or kinking. But in practice, I’ve never had an empty tube
dent or kink. A tip would be to buy some brass tubing as close to the
size you need at a hardware store and practice with that before you
use your tube, this will also help you determine the diameter the
dowel or mandrel needs to be. If you need several bangles, just buy
an extra-long tube and make a bigger coil.