Heatbending and Heatshrinking. Light, Coiled And Lyrical. Part III

Heatbending and Heatshrinking.
Light, Coiled And Lyrical. Part III

FRESHLY CUT, THIN BLACK BAMBOO CULMS that were heatbent with a torch about a day or so after culling. A broom handle mandrel was used, to make these single and double tight radius bends. Those on the left were from a batch that still had too much moisture, so the bends needed to be tied with thin copper wire to hold their shape until they dried more. The diameters of the bends were 3.5-3.8 cm.

FRESHLY CUT, THIN BLACK BAMBOO CULMS that were heatbent with a torch about a day or so after culling. A broom handle mandrel was used, to make these single and double tight radius bends. Those on the left were from a batch that still had too much moisture, so the bends needed to be tied with thin copper wire to hold their shape until they dried more. The diameters of the bends were 3.5-3.8 cm.

 

With the current drought in California, many plants are suffering. I have lost one species of clumping bamboo, another is threatened and my favorite black bamboo is not doing well, with many plants of the grove dying. I am able to cull some of the dying plants before they change to the point where they are not useful for jewelry but others are too far gone. This has prompted me to prune a few thin culms off those struggling but still live grasses, to see how they will heat bend while still fresh. Most were of so small a diameter I would not have used them in the past, except perhaps for intertwined torques or earrings (Liu 2012).

 

HEATBENT DOUBLE TIGHT RADIUS BEND CULMS in process of being made into earrings. One of pair has square 18 gauge bronze wire matrix fitted to bent bamboo circle. One end of wire fits into drilled hole, other into a slot filed in upper part of circle. Finished example in last image of blog. Note thin copper wire holding bent bamboo in place while piece is being worked.

COVERLITE GLUED in place but not yet trimmed before heatshrinking. Trimming results in better heatshrinking, reducing crinkling and also eases cleanup.

SINGLE TIGHT RADIUS BEND EARRINGS, with heatshrunk Coverlite on wire matrix, precious coral and sterling silver bead terminations and 18 gauge sterling silver earwire, handformed, forged and buffed. In this type of earring, both ends of the wire matrix are in drilled holes, which are glued into place; ca. 9.5 cm long. Open end of silver earwire worn toward head.

 
 
SQUARE BEND TORQUE WITH FOSSIL SHARK TOOTH VS INTERTWINED TORQUE AND PENDANT, latter with freshly cut black bamboo culms. Note how tight the intertwining, as well as the bail of the pendant is also a tight radius bend. This torque is decorated with vintage Bohemian glass rings and beads from the African trade, and Baule brass bead terminations. The 45-70 million years old fossil  Lamna  shark tooth from Morocco is accentuated with two Cornaline d’ Allepo Venetian beads, which simulate the way Polynesians use red sealing wax to decorate their shark tooth jewelry. The tooth is attached to the bamboo with wrapped, annealed square bronze wire.  All photographs by Robert K. Liu/Ornament.

SQUARE BEND TORQUE WITH FOSSIL SHARK TOOTH VS INTERTWINED TORQUE AND PENDANT, latter with freshly cut black bamboo culms. Note how tight the intertwining, as well as the bail of the pendant is also a tight radius bend. This torque is decorated with vintage Bohemian glass rings and beads from the African trade, and Baule brass bead terminations. The 45-70 million years old fossil Lamna shark tooth from Morocco is accentuated with two Cornaline d’ Allepo Venetian beads, which simulate the way Polynesians use red sealing wax to decorate their shark tooth jewelry. The tooth is attached to the bamboo with wrapped, annealed square bronze wire. All photographs by Robert K. Liu/Ornament.

 
 

      Of the two batches I culled, one was used about a day after cutting; when heated with an acetylene or Orca propane/air torch, these bent very easily around a small diameter wood dowel held upright in a vise. As seen in the first photo of this blog, some were single tight radius bends, others double tight radius bends. Still others were bent into circles at both ends, to act as pendants, with the top bend serving as the bail. In a second batch, used the day after also, the bamboo was still too laden with moisture, so that it was necessary to twist fine copper wire around the bends, to keep them from springing apart after heating and cooling.

These tight radius bend black bamboo components were used as a pendant on an intertwined torque, and two styles of earrings. I felt the bends from freshly culled bamboo had that wonderful lyrical feel reminiscent of plant growth and form that I try to capture in my jewelry. In order to add the color that is suggestive of flowers, or seed pods, I integrated square wire matrices into the bamboo bends, then attached red Coverlite. Since model airplane coverings are films and not fabrics, they do not drape or fit well into small crevices or discontinuities. Therefore when you are working with Coverlite or similar materials, you have to keep gaps to a minimum. In order for such polyester films to really heatshrink, every attachment surface must be uniformly glued. When glued and heatshrunk, this model airplane covering brings both color and pleasing geometric planes into play for these very light, yet strong earrings.

 
CLOSEUP OF TIGHT RADIUS BEND PENDANT, COMPARED TO SINGLE AND DOUBLE TIGHT RADIUS BEND EARRINGS;  the one on the right is an older pair, made from bamboo harvested and dried for a long period, versus two Coverlite adorned ones on the left which are from freshly culled culms. The positioning of the wire matrix results in either horizontally or vertically oriented panels of red. Both have decorations of red precious coral and sterling silver beads, as well as hand-formed/forged silver earwires. The older example has vintage Bohemian glass, and Ethiopian silver beads for decorations. Earrings are 9.5 - 12.2 cm long.

CLOSEUP OF TIGHT RADIUS BEND PENDANT, COMPARED TO SINGLE AND DOUBLE TIGHT RADIUS BEND EARRINGS;  the one on the right is an older pair, made from bamboo harvested and dried for a long period, versus two Coverlite adorned ones on the left which are from freshly culled culms. The positioning of the wire matrix results in either horizontally or vertically oriented panels of red. Both have decorations of red precious coral and sterling silver beads, as well as hand-formed/forged silver earwires. The older example has vintage Bohemian glass, and Ethiopian silver beads for decorations. Earrings are 9.5 - 12.2 cm long.

 

While all of these torques and earrings look fairly easy to make, they in fact require a great deal of work, since no two are really alike, due to the natural variation in both the form/size of the bamboo and how it reacts to heatbending. So time-consuming adjustments have to be made to each piece, rendering each finished jewelry one-of-a-kind.

REFERENCES/BIBLIOGRAPHY
Liu, R. K. 2002/2003 Design Experiment. red lantern
earrings. Ornament 26 (2): 82-83.
—2010 Design Study. Bamboo Torque. Ornament 33 (3): 70-72.
—2012 Bamboo Jewelry. A Sustainable Resource. Ornament 35 (3): 60-65.
—2014a Matrix Jewelry. Building Light and Volume. Ornament 37 (4): 56-61.
—2014b Photography of Personal Adornment. Photographic Techniques for Jewelry/artwear Craftspeople, Researchers, Scholars and Museum/gallery Staff. San Marcos, Ornament Magazine: 164 p.

 

The Magic Of Heatshrinking. Light, Volumetric And Colorful. Part I

The Magic Of Heatshrinking.
Light, Volumetric And Colorful. Part I

EARRINGS OF SQUARE BRASS AND ROUND STERLING SILVER WIRE, COVERED WITH COVERLITE OR ULTRACOTE COATINGS; both wires are 18 gauge. Brass square half-hard wire is formed on mandrels, while silver earwire are shaped with pliers and lightly forged. Except for the yellow triple coil earrings, all others have only one or two panels covered. Note that the top pear-shaped earring, covered with Ultracote, has really beautiful curved and complex surfaces caused by the heatshrinking of the model airplane coating. It is better shown in other photographs in next blog. Foreground Pod earring is ca. 7.0 cm long. All these photographs are taken with a Canon 7D, and 60 or 100mm Canon macro lens, and studio strobes, against Tufflock, transiluminated plex or Varitone backgrounds (Liu 2014b). Photographs by Robert K. Liu/Ornament.

EARRINGS OF SQUARE BRASS AND ROUND STERLING SILVER WIRE, COVERED WITH COVERLITE OR ULTRACOTE COATINGS; both wires are 18 gauge. Brass square half-hard wire is formed on mandrels, while silver earwire are shaped with pliers and lightly forged. Except for the yellow triple coil earrings, all others have only one or two panels covered. Note that the top pear-shaped earring, covered with Ultracote, has really beautiful curved and complex surfaces caused by the heatshrinking of the model airplane coating. It is better shown in other photographs in next blog. Foreground Pod earring is ca. 7.0 cm long. All these photographs are taken with a Canon 7D, and 60 or 100mm Canon macro lens, and studio strobes, against Tufflock, transiluminated plex or Varitone backgrounds (Liu 2014b). Photographs by Robert K. Liu/Ornament.

I   have always believed that earrings were the most frequently worn piece of jewelry, next to necklaces, although I have no hard figures (Liu 1998). In tribal cultures, earrings might be items of personal adornment that are rarely changed, but in Western societies, earrings are switched with the occasion or the mood. Thus, many women usually own large collections of them, since their lower cost relative to other types of jewelry enhances the opportunity of buying more, or of wearers making their own. However, certain generations may now have changed their buying habits and own fewer.

      While there may have been studies on what attracts the eye more, the human figure or the face, it is the latter that draws our attention when we look closely at someone. Since I write about jewelry, am a photographer and also a jeweler, I often study what types of earrings are being worn. I like and frequently make discreet and small earrings (with precious materials and/or ethnographic/ancient artifacts); smaller, discreet earrings are probably worn the most but I frequently see large hoop earrings, which often have little visual mass or interest, other than their size. I feel earrings should have both visual interest and good design. I am especially drawn to large, light ear adornment, especially colorful earwear that give a suggestion or a feeling of a flower tucked behind a ear, such as is the practice in some tropical cultures. An example would be the Chinese lantern flower earrings I made in 2002/2003, which give the impression of such flowers dangling from the earlobes, but are actually light, heatshrunk covering over a soldered and formed gold wire matrix. Since these earrings dangle off the earlobe, they easily catch light coming from the front or back. With only one pivot point from the earlobe, they also swing easily, adding eyecatching movement.

      When I began to explore combining light, volumetric and colorful pendants to go with my heatbent bamboo jewelry (Liu 2012, 2014a), I returned to using high-tech model airplane coverings that were heatshrunk during or after application to the model plane skeleton, which are often of balsa wood. In my case, I fabricated metal rod matrices, onto which I glued European polyester model airplane coatings of Coverlite or Ultracote, with cyano-acrylic glues. (There are perhaps twenty or more types of coverings for airplane models that fly, of varying thicknesses; I have used about four, some of which were not identified, as they were cutoffs sold in unmarked rolls.) Then I used either torches or heatguns to shrink this covering. Sometimes the heatshrinking created wonderful geometric planes that were aesthetically very pleasing, but often unpredictable and sometimes not repeatable, so pleasing results are sometimes due to serendipity.

 
HEATGUN VS OXYACETYLENE TORCH, respectively ca. 600 °C and 3100 °C, a difference of about 1500 degrees. Usually, I use an acetylene or propane/air torch to heatbend bamboo and/or solder; these are respectively 2400 and 1980 °C. Heatshrinking polyester can be done with a torch, but is safer with a heatgun.

HEATGUN VS OXYACETYLENE TORCH, respectively ca. 600 °C and 3100 °C, a difference of about 1500 degrees. Usually, I use an acetylene or propane/air torch to heatbend bamboo and/or solder; these are respectively 2400 and 1980 °C. Heatshrinking polyester can be done with a torch, but is safer with a heatgun.

IN PROCESS FIG/PEAR-SHAPED AND POD EARRING MATRICES, shown with a bakelite bead (3.2 cm diameter), imitation of copal from the African trade, that I used as a forming mandrel for the square wire matrices, which are soldered at top and bottom. Earwires are 18 gauge sterling silver, and bent, forged and buffed smooth.

IN PROCESS FIG/PEAR-SHAPED AND POD EARRING MATRICES, shown with a bakelite bead (3.2 cm diameter), imitation of copal from the African trade, that I used as a forming mandrel for the square wire matrices, which are soldered at top and bottom. Earwires are 18 gauge sterling silver, and bent, forged and buffed smooth.

      Learning what works and what doesn’t is all part of building one’s skillbase. The cost of mistakes is a good tradeoff for growth as a craftsperson. If one does not go beyond his or her safety zone, there is not much chance of innovation. While seemingly trite, work does beget work, and unsuccessful experiments often drive improvement and innovation.

 
HEATBENT BAMBOO TORQUE WITH METAL ROD MATRIX PENDANT, of silicon bronze rod covered with Coverlite. The pendant is only covered on three sides and was bent on a vise, then soldered, It was cold-joined to the torque and the Coverlite still needs slight cleanup with files.

HEATBENT BAMBOO TORQUE WITH METAL ROD MATRIX PENDANT, of silicon bronze rod covered with Coverlite. The pendant is only covered on three sides and was bent on a vise, then soldered, It was cold-joined to the torque and the Coverlite still needs slight cleanup with files.

COVERLITE MATRIX PENDANT ON HEATBENT BAMBOO TORQUE AND WIRE MATRIX EARRINGS, some of which are in sets of three, to be worn in different asymmetrical pairs, or are an asymmetrical pair, like the yellow/red cube and triangle. In foreground are two pairs of symmetrical Pod earrings, with all red or red/yellow Coverlite skins. Earrings are 5.0-7.5 cm long and weigh between 1.6 to 3.1 grams each, all from 2014.

COVERLITE MATRIX PENDANT ON HEATBENT BAMBOO TORQUE AND WIRE MATRIX EARRINGS, some of which are in sets of three, to be worn in different asymmetrical pairs, or are an asymmetrical pair, like the yellow/red cube and triangle. In foreground are two pairs of symmetrical Pod earrings, with all red or red/yellow Coverlite skins. Earrings are 5.0-7.5 cm long and weigh between 1.6 to 3.1 grams each, all from 2014.

 

REFERENCES
Liu, R. K. 1998 Ethnographic Earrings. Function and Form. Ornament 21 (4): 38-41.
—2002/2003 Design Experiment. red lantern earrings. Ornament 26 (2): 82-83.
—2010 Design Study. Bamboo Torque. Ornament 33 (3): 70-72.
—2012 Bamboo Jewelry. A Sustainable Resource. Ornament 35 (3): 60-65.
—2014a Matrix Jewelry. Building Light and Volume. Ornament 37 (4): 56-61.
—2014b Photography of Personal Adornment. Photographic Techniques for Jewelry/artwear Craftspeople, Researchers, Sholars and Museum/gallery Staff. San Marcos, Ornament Magazine: 164 p.