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Member Since 04 Oct 2011
Offline Last Active Yesterday, 07:59 PM

Posts I've Made

In Topic: Biodiesel Fired Kiln

24 May 2017 - 10:01 AM

Very good! I would love to see some pics of the burner itself.

In Topic: Opening Peep Hole With Vent On...

24 May 2017 - 10:01 AM

Dry your work upside down.

In Topic: Help Firing Mistake

24 May 2017 - 10:00 AM

If you only fired to bisque temps, it will be fine. Just start it again on the glaze program. If you fired all the way up to glaze temps, it will probably be fine- wait for it to cool and check it out.

In Topic: Opening Peep Hole With Vent On...

23 May 2017 - 07:50 PM

Putting pieces close to the lid will not block the flow of air for the vent. No worries there. However, leaving a peep hole open spoils the draft of the vent. The good news is that for the pots it's not a huge deal since leaving the peep hole open brings fresh air into the kiln, however it allows fumes to come out of the kiln and into the room, so it's not good for you. Leave the peeps in if the vent is being used.


None of the explosions were related to the vent, nor were they due to air bubbles. Air bubbles do not blow up. Air only expands about 1.5 times from room temp to 2000 degrees, which is not enough to blow apart the clay. Steam causes explosions. In the first 200 degrees of the firing, pots must evaporate off any remaining water in their walls before it turns to steam. Thick pieces aren't able to evaporate off all that water in a typical firing schedule, and when that water turns to steam it expands 1,700 times and blows up your pots. So for thick pieces you have to either do a preheat to dry them out, or fire much slower.

In Topic: Midrange Firing First

23 May 2017 - 12:04 PM

You're going to have a hard time applying glaze to work that has already been fired to vitrification.