If you want to know more about cores generally I did cover this in last year's A to Z, however this is about how I core my own beads as part of My Glass Beadmaking Journey.
I know that a lot of people prefer a 1 piece core that is manually folded over at the ends to make the bead core. So I set out to learn how to do this!
When I started doing these I had quite a high failure rate; several cores split and I even had 2 beads split by tightening the core too much.
Luckily I've improved my technique a lot since then which means I don't waste so many beads and too much silver!
I start with a tube that I cut down to size to fit each individual bead, I use a tube cutter, a deburring tool (top left) and a file to make the ends smooth. I practiced a lot with brass and copper tubing (bottom left) after realising it wasn't as easy as it looked on YouTube!
I now use Argentium Silver 960, which you can read more about here. This is a very pure silver and my supplier anneals this (makes it soft) for me so I don't have to, the metal needs to be softer to start with or it won't bend in the right way. You can see that you need a lot more tube to start with than the width of the bead (top right).
I then use a tool which slowly starts to fold the tube over itself to form a lip, you do this very slowly, bit by bit, turning the bead over and over so that what you do to one side, you've done to the other until you have a finished bead with a core! Ta-daa!
What new skill have you had to learn recently?