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ORTON Three Cone System

Orton 3 cone system Cones

     Kilns are rarely uniform in temperature, particularly the larger ones. This is because there is much more to heat in a larger kiln than in a smaller one. Using witness cones or shelf cones, one can determine the amount of heating variation within the kiln. To evaluate kiln uniformity, sets of three consecutively numbered cones can be placed on each shelf during firing. Afterwards, they can be examined for differences to determine how much variation occurred. Typically, you will see at least one cone difference from top to bottom of the kiln. This can be even larger depending on the kiln construction and the cone number being fired. How fast the kiln is heated and how heavily loaded it is will also affect temperature distribution in the kiln.

      While a single cone may be used on the shelf to `witness' the firing, it is common practice to use three different cones. A group consists of a Firing Cone - the desired cone for the ware being produced, the Guide Cone - one cone number cooler, and the Guard Cone - one cone number hotter than the firing cone. These cones are set deep in the kiln. In larger kilns, using this three cone system on the bottom shelf, middle of the kiln, and top shelf will give you a good idea of over-all firing uniformity.
When the Guide Cone starts to bend, the ware is approaching maturity. The bending of the Firing Cone indicates firing is at the correct point. If the Guard Cone has bent, you have exceeded the best time-temperature relationship.  If you want to view the cones through the peepholes, welders glasses should be used to avoid possible eye injury. Sunglasses are not recommended.
Using the three cone system can often be the first line of defense in examining firing problems.

Orton Cones

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Paragon Kilns     Orton Vents & Cones
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American Ceramic Supply Company has been selling and servicing ceramic kilns to the ceramic industry, schools, individuals and studios for 40 years. Based in Fort Worth, Texas, American Ceramic Supply Company services and supplies ceramic equipment and supplies to traditional ceramic shops, paint your own pottery studios, ceramic potters, art teachers and art educators, ceramic and pottery finished ware producers, ceramic and pottery home based hobbyists. American Ceramic Supply Company provides education, training and consulting services to traditional ceramic shops, paint your own pottery studios, potters, art teachers and art educators, ceramic and pottery finished ware producers and home based hobbyists. American Ceramic Supply also educates and assists the architects, contractors, builders and electricians for our customers as they create their ceramic shops, paint your own pottery studios, ceramic rooms in their new schools and buildings and in their homes.

American Ceramic Supply Company and American Glass Supply Company sell ceramic kilns including Paragon Kilns, Skutt Kilns, Amaco/Excel Kilns, Cress Kilns and Olympic Kilns. Paragon’s Kilns include the Touch and Fire electric automatic kilns such as the TnF 82, TnF23, TnF24, TnF27 and TnF28’s, the Ovation kilns, Dragon and Super Dragon kilns, Iguana Kilns, Caldera and Clamshell Kilns, Janus kilns, as well as the small kilns such as the SC series kilns, heat treating kilns, doll and porcelain kilns. Skutt kilns include the Kiln Master kiln series - the popular KM818, KM1018, KM1027, KM1218, KM1227-3 and KM1231 kilns, the Glass Master kiln line such as the GM814, GM1014, GM1214 - the very popular GM1414 coffin kiln, and the production glass kiln line - the GM818, GM1018 and the GM1227-3 as well as the Skutt Hot Start Pro Kiln and the new Firebox kilns - Firebox 8 and Firebox 14 including the clamshell kiln GM22. Through American Ceramic Supply Company, Olympic Kilns has fantastic gas and glass kilns, raku kilns, electric - manual and automatic kilns such as the Dual Media Kilns, the Champ kiln, the Freedom Series kilns, the Commercial Electric kilns, and the Torchbearer Gas kilns- both available as propane or natural gas kilns. Olympic also has truck kilns, commercial industrial kilns, custom kilns, DPF Cleaning Kilns and industrial kilns. Amaco kilns and Excel Kilns are very popular kilns with teachers and art educators. Front loading kilns, top-loading kilns, professional kiln line series, Fine Art kilns, Professional Kiln series, and metal enameling kilns are all part of the Amaco kilns and Excel kilns production series. Whether you need a pottery kiln, jewelry kiln, silver art clay kiln, glass fusing kiln, glass slumping kiln, knife heat treating kiln, clay tile production kiln, low fire kiln, high fire kiln, 120V kiln, 240V kiln, 208V kiln or even a 480V kiln! -
American Ceramic Supply Company can provide you with just the kiln for your very special needs and desires to last you for a very long time!

American Ceramic Supply Company continues to sell, service, educate and provide on-going marketing and technical support to the ceramic and pottery industry. Our goals are the best customer service we can possibly offer, generosity of information to our customers so that they can succeed and accomplish their ceramic dreams and desires and
doing the right thing by God and Country.

American Ceramic Supply Company, Inc. - est. 1975
American Glass Supply Co.
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