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High Bridge Pottery

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Everything posted by High Bridge Pottery

  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

    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
  10. High Bridge Pottery

    University Assignment Survey

    It is just a google survey, no virus.
  11. 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.
  12. 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.
  13. 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.
  14. 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.
  15. 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.
  16. 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.
  17. High Bridge Pottery

    Kiln still stalling

    The easiest way to know what pressure you need it to find out what size orifice is in the burners. I have been dubious about the constant pressure regulator since the start but I am still confused on how you ended up with propane burners on a natural gas regulator if that is the case. If you were just using propane with a complete natural gas setup it seems that it would make the btu more not less.
  18. High Bridge Pottery

    Kiln still stalling

    @Linda A Why have you decided 12 inch WC is the right max pressure? Sounds to low to me and probably why you are stalling at 2000f / 1000c~ Do you know what size orifice the burners have? If it's smaller than 2mm than you won't be getting 60,000 btu gas out the hole.
  19. High Bridge Pottery

    How did you learn to fire your own kiln?

    The best way to learn is to fire it Seems like you had a good start as you already worked out less gas can be more heat. When it's real hot is the best time. I think the splintering noise you can hear is fine, not sure it is the pots.
  20. High Bridge Pottery

    Cromartie Safefire 3000 series 2 help

    How do you link the programs?
  21. High Bridge Pottery

    Cromartie Safefire 3000 series 2 help

    I can't find any manual on the safefire but there is one called Studio 3000 that looks similar and has this. https://www.potclays.co.uk/studio/files/cms/pages/downloads/controllers/download-list-files-8867.pdf?nocache=20180917045822 Is there a button on the side under the cromartie logo? or try pressing up and down when it is saying end.
  22. High Bridge Pottery

    Fluke Pyrometer question - need correct Thermocouple!

    Sounds like it is a dodgy thermocouple then if the Fluke is reading fine with the other probe.
  23. High Bridge Pottery

    Fluke Pyrometer question - need correct Thermocouple!

    It measures the voltage output not the resistance of the wire. I think with the wire connecting to the thermocouple you don't want to use certain types of metals because they can interfere with the reading as adding another type of metal can create its own voltage. @Rex Johnson If you could measure accurately what mV are output by the thermocouple you could work out if it's the thermocouple or the meter. Are you sure the meter hasn't selected the wrong type of thermocouple because mine has an option to select which type you have. My guess is the very thin wire is two wires, did you open the connector to see if there's two? The voltage is also non-linear so I think cheaper meters don't take that into account so can give you wrong readings. I remember in writing my kiln software I had to add an equation to 'straighten' the line.
  24. After 1.5~ years working as a receptionist and saving money I have moved to Stoke-on-Trent to find a job in a pottery factory :lol:

    1. Show previous comments  2 more
    2. High Bridge Pottery

      High Bridge Pottery

      Found a job as a belt attendant, lots of moving and stacking pots in the decorating department :lol: not the most exciting work but better than answering the phone.

    3. JohnnyK


      It's a foot in what may be a very big door for you...GOOD LUCK!

    4. Joseph Fireborn

      Joseph Fireborn

      YAY! Fanfreakingtastic! Best of luck to you.

  25. I find if I wiggle my head from side to side they can appear from the glowing mess as your brain picks up the outline of the cone. No easy answer, they are just difficult to see. Do you use any welding glasses for eye protection / decrease light and make it slightly easier.

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