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Bottom Shelf Cone Bend


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Cone 6 firing. The bottom shelf is 2 half shelves. There is a downdraft vent. The bottom shelf is 1 inch from the floor. Would the bottom shelf temperature go up if the shelf was 2 or 3 inches from the floor?

 

The cones are cone 6. The 2 touching cones were on top and middle. I had a problem of top shelf not getting to temp, but read about placing a cap shelf in the kiln - it worked. Now to get the bottom adjusted...

 

 

post-13363-0-61524200-1479220629_thumb.jpg

post-13363-0-61524200-1479220629_thumb.jpg

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I'd try raising the bottom shelf to 2-3".

What shape is the kiln and where is the flue?

You'll need some air space faround the flue to pull air/flame, especially if it's under the bottom shelf.

Also, leave some space (gap) at least 1/2" between your half shelves and reverse that gap every other shelf stack.

Hope that helps.

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This is my firing schedule. I was thinking of lowering the 2185 to 2170 and holding for 30 minutes. What do y'all think?

 

Glaze cone 6...

Segment        Rate F*/HR    Temp    Hold
   1            100         230     30
   2            400        1975      0
   3            100        2185^     15
   4           9999        1700      0
   5             50        1600     60
   6             50        1500      0

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  • 3 weeks later...

OldLady,  I checked the bottom shelf, 1 inch from floor of kiln, and it was in the middle of an element. I raised the bottom shelf 1 inch to make it a total of a 2 inch rise for the bottom shelf above the floor of the kiln and not be in the middle of an element. Also, put a whole shelf instead of 2 half shelves on the bottom.

 

It worked the cones on the bottom shelf look the same as the cones on the middle and the top shelf.

Here is a pic. Foreground is the bottom, then middle, then top cones.

 

post-13363-0-43243300-1480985156_thumb.jpg

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  • 2 weeks later...

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