Our good friend David Coggins from “Down Under” shares the following pointer:
Debris from exploding ware inside the kiln sometimes lodges in the Kiln Sitter refractory tube. These fragments can interfere with the travel of the actuating rod, resulting in an over-fire. After you have removed exploded clay fragments from the firing chamber, always check the refractory tube for debris. It may not be readily apparent that fragments are still inside the tube.
David also recommends that each time you vacuum the kiln, also vacuum the tube assembly. First, remove the cone supports from the Kiln Sitter tube. Then place a vacuum hose directly over the tube. This removes not only debris but also rust from around the pivot point.
I would add that whenever placing a cone on the cone supports, check the travel of the actuating rod. It should be free to move up and down without binding.
Thanks, David, for the great idea.
Arnold Howard Paragon Industries, Inc. firstname.lastname@example.org