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How many degrees between these cone positions?
I was consistently getting the cone on the left when using a custom-programmed firing schedule to 2204F (for cone 6 with ten minute hold). However Orton recommends that the tip of the self supporting cone should be even with the top of the base (they consider the indicating part of the cone to be the part above the base). So I adjusted the program to finish at 2200F and got the cone on the right. But note: This applies to that kiln at that point in time (with that pyrometer and that firing schedule). Our other test kiln bends the cone to 5 o'clock at 2195F. Since kiln controllers fire cone 6 at 2230 (for the built-in one-button firings) your kiln is almost certainly over firing!
Related Pictures
Bloating on a range of bodies at cone 6: Why is this happening?
The problem occurred with standard Plainsman M340, M390, M350, M370 and P300. The stonewares have porosities of 2.5%, the M370 1% and the P300 0.5%. Thus, all of these have comfortable margins for over firing. The G2926B glaze, used on all of them, does seal the surface pretty early so it will contribute to over-fired ware bloating sooner than typical. The problem here is the cone-fire modes on kiln controllers. For this kiln, the cone 6 program goes to 2236F. That's cone 7. Or more. Most people do not want to manually program their controllers. This is unfortunate since they do not benefit from the drop-and-soak PLC6DS and slow-cool C6DHSC firing schedules. And they end up over-firing their ware. Here is what many do: They cone-fire to cone 5. That produces cone 6!
Links
| Glossary |
Firing Schedule
Designing a good kiln firing schedule for your ware is a very important, and often overlooked factor for obtained successful firings. |
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| Glossary |
Cone
Devices that melt and bend in a ceramic kiln at specific temperatures when subjected to specific up ramps. Today, cones are used to calibrate controllers. |
| Firing Schedules |
Plainsman Cone 10R Firing
Six-step oxidize-at-end schedule to 2372F |
| Firing Schedules |
Plainsman Typical Cone 04
Four-step to 1940F with short hold and free-fall |
| Firing Schedules |
Plainsman Cone 6 Electric Standard
Used in the Plainsman lab to fire clay test bars in our small kilns |
| Firing Schedules |
Cone 03 Fast Fire
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| Firing Schedules |
Low Temperature Drop-and-Hold
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| Firing Schedules |
Cone 6 Drop-and-Soak Firing Schedule
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| Firing Schedules |
Plainsman Cone 6 Slow Cool (Reactive glazes)
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