Wenn Sie mit dem Clay direkt aus der Packung arbeiten, wird das das "feuchte Stadium" genannt. Ein Haartrockner oder den Clay auf den Ofen zu legen, funktioniert wunderbar. Heisse Platten oder Lebensmitteldehydratoren funktionieren ebenfalls.
Zur Kontrolle, ob der Clay komplett trocken ist, geben Sie den warmen Clay direkt nach dem Trocknen auf einen kalten Spiegel. Nach Sekunden, nehmen Sie den Clay ab, und stellen Sie sicher, dass auf dem Spiegel keine Kondensation vorhanden ist. A thermocouple will not read as accurately as it ages an older thermocouple will fire hotter than it reads , so test fire your kiln every 75 firings using cones to verify the accuracy of the firings.
Sign up for our mailing list if you'd like us to keep you posted on the latest information on working with BRONZclay. We send email only when there is something really pertinent to your interests, so you can safely subscribe. If you want to know more about the technical aspects of firing BRONZclay, the rest of this article explores those areas in detail. Which one you use is determined by the thickness of the item being fired. There is a "thin" firing schedule for a thickness of 6 cards 3mm and less, and a "thick" firing schedule for clay thicker than 3mm.
The "thin" schedule seems to work well for most people, but takes 5 hours. I wanted to see if that time could be shortened. The "thick" schedule gave me some problems in sintering over 5mm in thickness.
Some pieces only formed a thin shell of metal with powdered bronze in the core, and some came out brittle. I wanted to find out why those things happened and figure out a firing schedule that would work for every BRONZclay firing. My firing schedules are based on some very simple observations.
Another observation was that thin pieces, 3mm and less, didn't seem to be bothered by rapid heating. It was only when the thickness was more than 3mm that splitting occured. With those ideas in mind, I realized I could heat thin pieces at full ramp speed, saving 2 hours in the total firing time. I have also found a way to determine the time required to sinter any given clay thickness by using a simple formula: Divide your kilns target temperature by the thickness of the clay and you get the rate of heat per hour.
The firing duration is automatically set when you enter in the rate of heat. The duration is roughly equivalent in hours to the thickness of the clay in millimeters. For instance, an item 7 millimeters thick takes a little under 7 hours to fire from start to finish. I have successfully sintered pieces up to 1 inch thick using this formula, and Bill Struve inventor of BRONZclay has successfully fired a 2" diameter solid sphere with my formula.
Your target temperature, if your kiln is an SC2 Watt model, will be F. For the SC2 watt model, your target temperature would be F. Hold Times Some firings require a hold time for proper sintering. Using a 4" tall pan will always require a hold time, regardless of the kiln wattage and size.
Only the short pans can be fired without the hold time. Since it is always safe to add a 2 hour hold time to the end of a program to assure full sintering, if you have the time, it's a good idea. If your kiln is not listed here, you can easily find your target temperature. Click here for instructions on finding your kilns target temperature. Clay Thickness Determines Heating Rate When programming a kiln for a firing, the rate of heat is set first. The rate of heat is how fast, in degrees per hour, the kiln heats to it's target temperature.
Use a millimeter gauge to measure the item to be fired at its thickest point, always rounding up to the next whole number. Divide that number by your kilns target temperature. The result will be the rate of heat per hour. It is not necessary to use a precision instrument for measuring. A simple plastic or brass gauge is sufficient. I've calculated the rate of heat for firings up to 16mm thick in the chart below.
To program the kiln for the 6mm thick BRONZclay firing, set the rate of heat to F per hour, the target temperature to F and the hold time at 2 hours. With this program, the kiln will heat at a rate of degrees Fahrenheit per hour until it reaches F, then the program will hold this temperature for 2 hours. After the hold time, the kiln will signal completion and begin to cool.
If your kiln has a small interior and you are using the small firing pan, the hold time would not be necessary. For simplicity, you could always add the 2 hour hold time to the end of a firing for good measure. What is Thickness? Keep in mind that width is not the same as thickness. For instance, if you roll out a slab that is 4mm thick, 20mm long and 15 millimeters wide, how long should it be fired?
The answer is 4 hours. It might be 20 millimeters long, but it's only 4 millimeters thick. It might be 15 millimeters wide, but it's only 4 millimeters thick. We measure only the thickness to determine firing duration. If 2 strips, each 4mm thick are attached together with paste, the assembly would then measure 8 millimeters thick and would require the 8 hour firing schedule. Be certain to measure at the thickest part of your clay for complete sintering.
For a firing that contains a variety of thicknesses, use the program for the thickest portion of the piece. Privacy Policy. Written by Cooksongold. Related Guides. Clay Clay jewellery making — Everything you need to know. Clay What stones can be fired with precious metal clay. Check the size of the fired piece against the outline of the unfired piece. If it hasn't contracted, the piece has not been successfully fired.
Repeat steps 5 — 8. Brush your piece with a brass brush to bring out the silver shine. You can also burnish it or tumble it to add to a better finish. Shop Silver Clay Tool Kit At Kernowcraft, we have a great range of metal clay tools and supplies , including Precious Metal Clay PMC and Art Clay in clay, paper, syringe and paste form as well as a range of metal clay tools and accessories including metal clay moulds, moulding compound, texturing plates and more.
If you're a metal clay beginner, you may be interested in our Silver Clay Tool kit which contains all the tools you need to complete your first project.
If you have any questions, feel free to get in touch with our friendly team who will be more than happy to give you advice over email or on the phone. We noticed you left some items in your basket on your last visit. Would you like to continue with this order? Discover the three ways to fire your metal clay designs with step by step instructions! We Recommend Experimenting First To get used to the firing process, we recommend that you first try a little experiment.
Tips For After Firing Prepare a stainless steel or glass bowl of water to cool off the piece after firing. Using A Gas Torch. When the time is up, turn off the torch and allow to cool. The Paragon SC2 kiln is one of the most popular and recommended kilns for using with all types of metal clay. Dim the lights slightly to see the glow properly.
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