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Why does the shut-off temperature in Cone-Fire mode vary for a particular cone?

The firing rate for the last segment of a Cone-Fire program is 108 deg. F / 60 deg. C per hour. If the kiln fires at that rate, the shut-off temperature should match the temperature on Orton's cone chart in the 108 deg. F column.

However, if the kiln is firing slower than the programmed speed, the controller will compensate by shutting off at a slightly lower temperature. This is because firing slower increases heat work, so the kiln does not need to fire as high. Your kiln may be firing slower than it had before. This could be due to element wear, low voltage, or a heavier load than usual.

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