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Showing results for tags 'firing schedule'.
Hi all! I just finished converting an old electric kiln to gas. The firing will be totally manual, no kiln sitter involved. Having never fired a gas kiln, I know my learning curve will be steep! But I need a few pointers to get started. I want to start out with a glaze firing, ^5, mainly because I don’t have any greenware to bisque right now. I have a few “sacrificial pieces” that I am willing to use to start the learning process. I have a pyrometer and witness cones ready to go. So, my main question has to do with ramping at this point. How fast do I want the kiln to increase in temperature on the way up to ^5? The pieces I have are made from Laguna 52 Buff, and glazed with Spectrum underglaze and/or Spectrum ^5 glaze. Idk if that makes a difference, or not. I am a wheel thrower, and I typically throw thin. Don’t know if that matters, or not, either! I realize that glaze firing in particular can vary based on the desired effect, but I’m looking for a basic framework to start from. Based on my small test fire (only brought the kiln up to about 900-1000*, empty, to decide if I need one burner or two) my biggest fear is that the temperature will rise too quickly, and the heat stress will cause issues-up to and including cracking/exploding. Thanks! Amy
Hi, I have owned a second hand Duncan EA 1020 studio plus kiln for around 12 years and have mostly been firing at the lower temps from cones 020 to 04. Cone 04 usually took around 6 hours. This kiln is an Automatic/Manual kin. 30amp. The Kiln is rated to fire to cone 8. It has a 20 hour timer. Element ohms have been tested and are slightly better than required Recently I wished to fire to cone 6. This has become a sticking point. I did a firing mid last year for cone 6, set the timer for 15 hours. The Kiln reached cone 4 almost 5. The next cone 6 firing was 20hours and the sitter shut it off. Witness Cones 4 and 5 were fully bent cone 6 was not quite there. Due to the time taken none of my glaze finishes were right and I ended up with a lot of browns which wasn't expected. I thought this was a bit long but I'm not sure with this kiln. If it takes 20hrs to reach cone 5/6 It is never going to reach cone 8. The kiln slows right down on ramp after 900degrees celcius. I think it is relying on soak times to get to the required cone. I've emailed paragon several times about parts and advice, they seem to think 10 hours was reasonable for cone 6. But if cone 04 takes 6 hours then I'm not so sure. I have replaced elements, relay switch, fixed Interval timer and about to replace the Repeat Cycle timer. As I'm running out of parts to replace and can't seem to find any information on how long this kiln would normally take to reach the temps I'm hoping someone here could answer this. Thanks for your time. Regards Kerry