Hello
I think there are some confuse answers in this thread!
Three centimeter seems a bit small when she is wanting to make
bracelets.
I think the Dutch colleague knews what he want! He don’t write, that he
want to make the bracelet from only one ring!
I have seen folk use a Boony Doon or Dakota Bulldog type press
to accomplish this.
That seems me a very expensive procedure. You need next the press a lot
of different disk cutters including a lot of stamps. For 3 cm disks or rings
made from up to 1,3 mm thick copper, silver or gold you need next the disk cutter with different holes and stamps an
heavy hammer!
I don't think that soldering a wire together and hammering it
flat will get the results that are desired.
Have you ever tried out to make a flat rings in this manner I proposed??
I recommend never a procedure, which I not have tried out by myself. I
hold a lot of workshops for “kitchen-table-goldsmith’s”, that means for people
who make jewellery only for fun. Mostly there room-space, there time and there
budget is very small and they make only a few pieces a year. And for that
reason I try to find procedures which needs a minimum of expensive tools. But
the result must be professional.
This are some results made with the procedure I suggest.

The both top frames were made from flat strips from 1 mm thick Sterling
silver. The right top ring is 50 mm in dia and 8 mm broad. The 2 rings below
was milled through a rolling mill to get the oval form.
If you’re interested to learn that and how you can do flat rings from
band wire or a strip of sheet, you can ask for the illustrated specification by
E-Mail: massow@emailkunst.de
And here some pictures how to make a flat band wire from round wire.
Tools you need: soldering equipment, a
mandrel, a rolling mill, a mallet or an hammer with a resin head.
I in this example I started with a 8 mm long and 2 ½ mm thick round
wire. If the wire is significant thicker, it is heavy to bend by hand.
Pic1) I bend the wire together to a “free-form ring”. Important is, that the
soldering seem close exact! Solder it with hard silver solder, I prefer a
working temperature of about ~770 Grad Celsius. Pickle the ring and if there
any surplus of solder, file it away.
Pic 2)The ring get rounded with a resin-head-hammer on a mandrel.
Pic 3) The rounded ring

Pic 4) Mill the ring in a rolling mill. Mill always maximum 0,1- 0,2 mm down. The ring get a bit oval.
Make the mill roller 0,1 – 0,2 mm closer and change the ring at right angels.
(see sketch below)

If the ring is not really round, anneal it and round it with a soft hammer on a mandrell
Pic 6) The result is a ring of 35 mm outer dia, 1.1 mm thickness and 3.5 mm
breadth.
Edmund
www.emailkunst.de