Adjustable Rings from Metal Clay – Yes, No?
Yes! I’ve been often asked if the metal is somewhat workable after firing, and wanting to be better safe than sorry, I’ve always said “No, do all fabrication before firing!” I still do all my fabrication before firing, but I also want to have the fired pieces be a little adjustable. What if a ring, for example, doesn’t come out the size I intended it to be? As you may have noticed, many factors can affect the shrinkage of a ring, including size, thickness, firing schedule, and firing environment (what else is in the kiln).
So I experimented with a a few open rings.
Two of them are Friendly Brilliant Bronze, one Friendly Copper and one Pearl Grey Steel. The copper one is 6 cards thick; the rest are 4. All rings distorted significantly during firing. They were all hammered into shape over the mandrel, with no cracking. They were then closed with two fingers.
To re-open them I needed to use the mandrel. The hardest to re-open was the copper (the 6-card-thick one). So far they have been opened and closed a few times without reaching the point of metal fatigue.
Friendly Brilliant Bronze was fired according to its regular schedule, with 1:30 hours hold at 1000°F. The copper and steel rings (I made a few of each) kept breaking until I raised the temperature to 1850°F (my kiln is brick, so that means 1900°F in a muffle kiln).
Just to see what would happen, I fired copper and Pearl Grey Steel at 1900°F (brick). They came out fine, although harder to bend. You may ask if this temperature is not too close to the melting point of copper. The answer is no, since the temperature displayed on the controller is always higher than that inside the carbon.
I am now firing both copper and PG Steel at 1950°F. Will report back.
That brings us to cuff bracelets.
This one was made with Friendly Brilliant Bronze, 6 cards thick, and weighs 35 grams. It was opened and closed a few times in order to slide it over my arm. I am currently working on an open copper bracelet. A test firing showed that the copper bracelet, when fired at the right temperature, can be opened and closed and the open parts can be moved up and down.
In the kiln now: Low-shrinkage Steel XT ring at 1950°F. At a lower temperature Low-shrinkage Steel XT cracked when bent. I still need to test a few other clays. Stay tuned!
March 5th, 2015 at 6:14 pm
Well – now I really do need a new kiln….Thanks Hadar for all of your hard work, continuing to push the envelope….
March 5th, 2015 at 6:20 pm
Thank you for sharing this great news Hadar!
Lovely pieces too!
March 5th, 2015 at 6:27 pm
Hadar,
March 5th, 2015 at 6:33 pm
Hadar,
Thank you most sincerely for doing all the experimenting for us; it would be quite expensive if the rings broke or cracked during the firing, especially as I would have 5-6 students’ rings in the kiln.
March 5th, 2015 at 7:58 pm
Such great and interesting news, Hadar. Thank you for your tireless (and valuable) experimentation. Love the adjustable rings!
March 5th, 2015 at 10:44 pm
Fantistic! You are now disproving everything we thought we couldn’t do.
March 6th, 2015 at 1:28 pm
Awesome, Hadar!
This is very exciting. I’m looking forward to reading about your latest findings. Beautiful work!
March 6th, 2015 at 3:51 pm
I say YES!
March 6th, 2015 at 9:33 pm
Wow, Hadar! This is what I’ve been hoping for, fitted rings and bracelets! Thanks so much for all your hard work. Hated missing class. . . .looking forward to next week when I can see those beautiful pieces in person.