Kiln Maintenance - Relay Replacement on a Paragon SC-2 Kiln

The day was bound to come when my Paragon SC-2 kiln would need some maintenance. I got a bit of warning that there was trouble coming when I started to hear a whining noise after the cycle had completed (after the regular beeping completion alarm). Eventually, I got the whine during the cycle, turning on and off as the relays clicked. When I called Paragon service, they suggested it might be a relay nearing failure, so I ordered a replacement to have at the ready. Then I decided to replace it immediately, as I read stories of the relay failure leaving the kiln full on to maximum temperatures. No melted silver for me, please!

The relay is the part that opens and closes, giving a clicking sound, to allow electricity to flow to the kiln heating elements. By turning the elements on and off in varying proportions, the kiln can adjust to any temperature. Relays have a limited lifetime, with only so many clicks in them. Failure is guaranteed, eventually. The failure may be either in the open or closed state. If open, the element fails to heat. If closed, the element can't turn off. For larger kilns with more than one element, losing a relay can be somewhat compensated for by the computer brain and the other elements. But with only one element on these small kilns, there's a potential melt down risk, with a total loss of glass or metal work inside the kiln. That's a risk I decided to avoid, thanking the kiln gods for the early warning.

The relay arrived with no instructions, so I started a web search to find out how to do it. The Paragon kiln instruction manuals are all online, including the SC-2 manual. The manual has detailed instructions for replacing the relay, with plenty of photos. If you're a visual learner, you may prefer the video demos available at Cherry Heaven. In either case, be sure to unplug your kiln before starting any repairs. As well as relay replacement, there are instructions on both sites for thermocouple and controller replacement, as well as lots of other helpful details such as programming instructions. Read more about relays in kilns on the excellent Paragon blog.

After all this research, I decided to make my own slideshow/video (a learning process in itself), and recruited my son to take photos for me during the ten minute procedure. Perhaps it will convince you that this is a simple process that all kiln owners can manage on their own.

25 grams of PMC Sterling

I was very happy to have the opportunity to play with the new PMC Sterling back in November. Finally we can have a metal clay that it is stronger and can me mark as .925 silver (sterling).


I got a package of 25 grams and I got into my studio to make some pieces with it. The working time for this type of clay is longer and it gives you the flexibility to not worry about the clay drying too fast while you are working with it. The color of the clay is darker and the texture is great and easy to work with.


My plan was to make a ring, earrings and a pendant. The first piece I made was the ring, I hand roll a long snake and wrap it around a mandrel to form the band. The joining of the joints was easy to make and I just added some water to smooth the connections.

I decided to go 3.5 sizes bigger than the size I need it for the ring. I do not use any inserts in my ring when I fired it, I believe it is better to let the clay shrink all the way.


Carving is another thing I wanted to try with this clay since most of my work has carving in it. I was surprise to see how smooth and easy carving was with this type of clay. The carving went perfect and I saved my carving scraps to add some texture in my pendant later on. 

Since the clay has a longer working time before it gets dry, I knew hand sculpting will be easy and great to do. I hand sculpted a rose to add to my ring and it was perfect for sculpting.

I let the rose dry first before I added it to the center of the band, this way you will not deform the rose. Adding the rose was easy by using water and fresh clay to join the rose to the band. I do not like to use paste for this, I prefer to use fresh clay instead of paste. I continue to hand formed little rose buds around the center rose and some leaves.


For the earrings I wanted to use sterling jump rings and fire them in place. I embedded them in the earrings with fresh clay and hand formed flowers and leaves. In the center of the flowers I attached a CZ Garnet. 

For the pendant I play with textures and added my carving scraps on top of the heart with water. I carved and hand formed roses for the front and back of the piece. I always like to add something extra on the back of my pieces.


My firing schedule was different from the package because my pieces were thicker than 3mm. For the open shelf firing I fast ramp to 1000F and hold there for 40 minutes. I let the pieces cool down completely inside the kiln before I took them out to do the second firing.
For the second firing I added a coat of activated carbon at the bottom of the steel pot and added my pieces in one layer. I covered them with more activated carbon and closed the pot with the lid. I fast ramp the kiln to 1500F and hold there for 45 minutes. I also let the pieces cool down inside the kiln when the firing was over.

This is how the pieces look like when they are fired and out of the kiln. A white matte color and they do not have any oxidation or black coloring in them, not even in the sterling jump ring.


I brush them with a brass brush and soapy water, added LOS Gel patina and finally I polished them in a magnetic tumbler.

EL CORAZON
©2011 Lorena Angulo
PMC Sterling
Photo: Speedy Peacock

FLOR
©2011 Lorena Angulo
PMC Sterling, CZ Hessonite Garnet, Pearls
Photo: Speedy Peacock

ROSAS
©2011 Lorena Angulo
PMC Sterling
Photo: Speedy Peacock

I want to continue experimenting and I am going to fire the clay to a longer time, maybe close to 2 hours. I will let you know how this goes and if the size of the ring shrinks more if I add more time to the firing.

I am sure you will all like to work with this clay and the best of all is that the price is very similar to PMC3.


Keep Playing, Keep Creating !!


Love,
Lorena Angulo