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High Bridge Pottery

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Everything posted by High Bridge Pottery

  1. Post your ideas for challenges here. Like peoples ideas for them to have a bigger chance of being selected for use. The more popular an idea the more likely it is to be chosen.
  2. High Bridge Pottery

    Bartlett Genesis on L&L E23T-3

    SP is the setpoint of the kiln, I can't remember if we ever found out what the Out values are. I am pretty sure the time is logged in 30 second increments so 0 is the start, 1 is 30 seconds in 2 in 1 minutes in and so on. I think you can only download the most recent firing but I could be wrong. With the thermocouple offset I think that means your thermocouple was not reading the right temperature to start with so you offset it to read the right temperature. No need to be adding or subtracting 58 to the temps when making your own programs.
  3. High Bridge Pottery

    Logging of kiln temperature to a computer?

    There's a few of us working on DIY kiln controllers over here. That certainly looks like a pretty easy option for logging temps to a computer.
  4. High Bridge Pottery

    Just another electric to gas kiln conversion

    Up to 800-1000c is the easy bit. As low as my burner goes I struggle not hitting 200-300c in 30 mins but the pots I fire have already been bisque in an electric kiln.
  5. High Bridge Pottery

    Gas kiln stalled . Why?

    Ok, if it is saying 10psi input I guess that should be for propane. I don't think natural gas ever comes at 10psi. The only reason I was worries is if you are supplying the burners with a low pressure they wont get 60,000BTU as that is related to the size of the burner orifice and the pressure of gas you are supplying. I had no issue using a single control valve before a flat regulator on a 4x burner gas kiln. Actually found it much harder to get an even turn/twist on each burner.
  6. High Bridge Pottery

    Corn syrup

    Corn syrup just seem to be a kind of glucose syrup anyway.
  7. High Bridge Pottery

    Just another electric to gas kiln conversion

    Nice looking setup you have there. I still think with the venturi burner you are going to need a chimney 2x that but it will be interesting to see what temps/cone you get. Did you get the burner from Northern Kilns?
  8. High Bridge Pottery

    Gas kiln stalled . Why?

    I am still not convinced that regulator is for propane pressure instead of natural gas. I think you need to find out what pressure that regulator is outputting. Whatever it is saying on the gauge wont matter once you hit the constant pressure the flat regulator is outputting. I may be completely wrong as nobody else seems to be worried and it's not a constant pressure regulator.
  9. High Bridge Pottery

    Temperature Algorithm?

    Some of my posts I do spend the time to put both C and F temps but not all the time. It would be a nice thing to have but this is off the shelf software so if the option isn't there already then I don't think we can easily get it happening. I am not sure what you use to view the website but I just open a new Chrome internet tab using ctrl+t then type '2240 f to c' in the address bar and google tells me.
  10. High Bridge Pottery

    Home Made Kiln Controller

    I have always been interested in electronics, still remember designing and making PCB back in school. The availability of good reasonably priced electronics is amazing, also a lot of rubbish out there too Did a bit of research into the Raspberry Pi last night and thermocouple measuring. Came across this product that is designed for a type K thermocouple, not the best for cone 10, but, after searching the forum if I can desolder the type K chip and purchase the right thermocouple type it 'should' work. Is it best to go for type S, or type N or type R. I am a little lost there. New chip seems to be around $5 No idea how this is going to work out, only studied basic programming on linux but there seem to be enough tutorials out there to copy and past my way to something that could work. http://www.adafruit.com/products/269
  11. High Bridge Pottery

    Pressure gauge reading

    I would do it that way with the one red valve before the flat regulator then you will get an equal flame to both burners. Those valves are not the easiest to slightly adjust evenly. You will have to work out a way to open the solenoid valves and stop the controller closing them or just remove them. I think the controller is working as intended its just not the best way to fire pottery. I remember an old post and somebody else had a kiln that turned burners on and off instead of starting from the lowest setting and slowly turning it up. It would not be impossible to fire that way but brings some more issues. I still think you want to find out what pressure that constant regulator is outputting. I am not sure if it is for natural gas or propane. Some of the issues with only hitting 1400f could be that. Even with the chimney as is I would thing 1800f should be possible.
  12. High Bridge Pottery

    Pressure gauge reading

    I have tried looking back through your pictures but I can't exactly work out how it is plumbed together. I think this thing is regulator that only outputs one pressure. I have seen one on my friends natural gas kiln. Are you sure these burners are set up for propane? If this is just before the burners then they will be getting a constant pressure I think.
  13. High Bridge Pottery

    Kiln problem

    Are the elements twisted at the end?
  14. High Bridge Pottery

    Parian kiln firing question

    I still have some glaze test I should have run 3 years ago I am 90% sure I fired this clay to cone6 with 0 sticking. Had worse from cone10 porcelain.
  15. High Bridge Pottery

    How much propane will I use

    3-6 firings a tank seems a good ball park figure. Somewhere there ish
  16. High Bridge Pottery

    DIY Refractory on Pyrometer Thermocouple?

    How and when is it stalling exactly? Could be the thermocouple could be the kiln. If it is hitting the right temperature when the cone bends then it doesn't sound too bad or off.
  17. High Bridge Pottery

    How much propane will I use

    10,000 btu /ft3 is a good over estimate I find and propane has 21,500 btu/lb so 9 x 10,000 = 90,000 btu x 8 hour firing = 720,000 / 21,500 = 33.4 lb propane. You can probably half this number easily as you are not going full wack for the whole firing.
  18. High Bridge Pottery

    How hot does this kiln get?

    I have never seen a kiln with squiggly element groves like that before. Not sure I agree with the 1300 temps as my 240v 15amp which is about that size struggle for going above 1200/1250 and this one is 110v.
  19. Does look like a Cromartie kiln but I have never seen one with a brick lid. If it is the same setup as mine with two elements in series they need to be 9~ ohms each or 18.5 total. 240 volts/13 amps = 18.46 ohms
  20. High Bridge Pottery


    How are these stacked in a glaze firing? I'm confused
  21. High Bridge Pottery

    Home Made Kiln Controller

    Did a little more tinkering on the kiln. Finally finished a little bit of code that sets an on off duty cycle from 0/6th on to 6/6th on every minute. I did mess up somewhere as in the late stages going from full on to full off the relay stayed on. You can see in the graph where it shoots up in temperature and I unplug the relay wire to get it to stop. It stays pretty close to the set-point besides that. The PID is doing little right now other than working out set-point temp - current temp. The current temp line does not match up exactly with the set-point line so something is off in the code there too. It was consistently under the set-point by a few degrees but looking it is above the blue line. Reasonably successful bisque firing but the thermocouple is reading a little low.
  22. High Bridge Pottery

    Just another electric to gas kiln conversion

    I got to cone10 easily with the forced air burner but not with the venturi burner. It was a while ago now but I remember none of the cones moving at all, maybe one of the 8's slightly. Still using the kiln but not very much as it has been winter and I haven't had any motivation to fire.
  23. High Bridge Pottery

    Just another electric to gas kiln conversion

    I think the chimney was some of the problem. A good breeze would make it rise in temps after stalling out. The thermocouple was also reading off by a lot but if I remember, cone8 was not budging. A taller chimney that is actually cemented together would be better. The flow of my kiln always seemed off and I think it might come down to my burner being in the wrong place. Using a forced air burner solved most of the issues but I still think there's a flow problem. Some of it also comes down to needing a bit more air space at the back instead of shelf.
  24. High Bridge Pottery

    Orifice Size for Propane Kiln?

    I used a 1.5mm drill for my orifice which is near enough 1/16th of an inch. Off the top of my head that works out at 60,000-70,000 BTU/h at 1 or 2 PSI but I would need to check the exact figures. Do you think the problem was too much air or not enough air? Maybe it is also not mixing great in the burner or do you have any kind of nozzle on the end? When starting I struggle to keep the temps from shooting up. Never had an issue with getting the temperature to rise. The orifice size is more related to how many BTU/hour you want at the pressures you can get, not sure there will be too much difference in how it functions although you seem to have found a bigger one better. Maybe the lower pressure allows for better mixing of the gasses. Do you have any photos of your burner? or a video would be great.
  25. High Bridge Pottery

    Ian Currie Test Tiles Forums?

    Them pesky eutectic. Maybe too much calcium? in corner C. It is reminding me of a tile I did with whiting and soda feldspar.

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