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High Bridge Pottery

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About High Bridge Pottery

  • Rank
    Joel Edmondson

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  • Gender
  • Location
    Stoke-on-Trent. England
  • Interests
    Rocks and fire

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  1. High Bridge Pottery

    Geeks only - Raspberry PI controlled kiln

    As eminem says, do exactly as I don't.
  2. High Bridge Pottery

    Geeks only - Raspberry PI controlled kiln

    A lot to me is just more than my old commercial kiln would click the relays. I am using mechanical relays so I guess it is much easier to hear it. Do you think as long as you can keep it cool then there is not much to worry about with SSR's? In this picture you can see my test, it does wobble a little on the climb so could be much better but it is pretty close. It does get worse as it goes up and I have never tested past 900c so some tuning is needed. I just had no idea how so bodged this way. The big rise/drop is because I didn't code going from on for 60's to off for 60's right and it stuck on so I pulled the control wire. That setup was one big safety issue in the corner of my bedroom. Only tried once, it gave me a headache.
  3. High Bridge Pottery

    Geeks only - Raspberry PI controlled kiln

    I read a few things on pid tuning and was very confused on what to do, the one you posted looks a little easier for kilns specifically. I just ended up using the pid code to read the temperature difference from setpoint + actualtemp with p=1 i=0 d=0. Does 2 seconds not get the relay to cycle on and off a lot? Maybe that has a lot to do with my pid use I ended up deciding every 60 seconds if the power should be on for 1/6th of the 60 seconds up to 6/6th. That got things to work pretty well and only turn on and off once in 60 seconds.
  4. High Bridge Pottery

    Geeks only - Raspberry PI controlled kiln

    The only rule I can find says information is presented at your own risk.
  5. High Bridge Pottery

    Geeks only - Raspberry PI controlled kiln

    Are you deciding if you should turn the relay off or on every 2 seconds? How did you come up with the PID values to use?
  6. In Shanghai airport on my way to Australia for Christmas and the only thing that I can seem to access is this forum ;D. Not blocked by their fire wall.

  7. High Bridge Pottery

    Geeks only - Raspberry PI controlled kiln

    Here's the MAX31855 circuit diagram if needed. I also have a board layout but probably cheaper to just buy the module from adafruit
  8. High Bridge Pottery

    Geeks only - Raspberry PI controlled kiln

    I found sometimes the MAX31855 spits out NAN when reading the thermocouple. Were they the kind of errors you were getting? @jbruce Have you seen the MAX31856 chip that can be used with all thermcouple types? https://www.adafruit.com/product/3263
  9. High Bridge Pottery

    University Assignment Survey

    It is just a google survey, no virus.
  10. High Bridge Pottery

    Trouble mixing dry glaze, much too thick!

    Does the yoghurt glaze get thinner if you stir it? Might be thixotropic, can be a useful property for glaze application.
  11. High Bridge Pottery

    Electric Reduction Firing

    Was there an issue with element corrosion? People always say it is a bad idea to combust things in electric kilns but I dunno how many have actually tried. I would be interested in the story.
  12. High Bridge Pottery

    Elements changing resistance?

    I mean parallel in how they are wired up together but after reading your post again it seems you measured the 16 ohms after installing. Parallel wired 16 ohm resistors (elements) will give you the 8.5~ ohms you are getting, or the only way I can work out how you might be reading 8.5 ohms. Two 16 ohm resistors in parallel would give you RTotal = 1/((1/16)+(1/16)) = 8 ohms. Whereas two 16 ohm resistors in series would be 16+16 = 32 ohms.
  13. High Bridge Pottery

    Elements changing resistance?

    Are they wired up in parallel? That would make some sense if they are reading around 8.5 and you only measured 16 when they were not wired into the kiln. Not sure if they measured 16 wired in and then changed to 8.5.
  14. High Bridge Pottery

    How did you learn to fire your own kiln?

    @tomhumf You can get away with using wet clay and making cone packs that don't blow up. I make a long thin (0.5-1cm) sausage of clay then hold/balance the cones on something flat and squish the sausage around them so it only holds at the sides, bottom of the cones sit on the shelf. Poke lots of holes. Never had one blow up.
  15. High Bridge Pottery

    Why is glaze blue

    Tin will give you similar variegation to titanium, worth every penny. Zirconium is much more uniform and opaque.

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