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Everything posted by Ju00Ls

  1. @jbruce Great stuff! I only mentioned the ground as I couldn't see any ground in your pic, so I thought I would just mention it. Yes, it is such great fun controlling a kiln, the most enjoyable bit for me was the first ever firing, and taking the pieces out the kiln lol, that's a huge cat! the pic is our Russian blue but we also have Siamese. yes, I do tend to "lurk" but only because i'm a bit dyslexic so I don't particularly enjoy reading or writing; thankfully coding and glancing over a few ic datasheets doesn't really count. lol
  2. Great project! I'm really enjoying following along with your progress. Just some comments from an artist (not an electrical engineer); the metal box to me looks very scary if it's not grounded. My kiln draws ~22 amps and I made sure the exposed metal sides of the kiln has a good ground path to earth that will easily dump enough current to allow the main breaker to go. (checkout ground bond testing) It looks like the AC power runs very close to the TC cable? to reduce noise you could try and keep the AC line away from the TC cable and also using a shielded TC cable. The TC anomalies (open / short) could be linked to the i2c library? the library not accounting for clock stretching maybe? as a workaround you could discard the values and perform another couple of temperature readings after a short delay and only branch your logic if multiple bad readings are present. When i built my own controller I too was getting noise; what I did was i took a few TC readings and discarded the upper and lower values, then I did a check to see if the readings were stable within a +- 1c value; if not, I output a buzzer tick noise; this greatly improved my temperature readings, and what I noticed was on odd occasions and when my hot water boiler came on the ignition caused a lot of noise on the TC wires, the noise was enough to throw a reading wildly off, but with the software error correction logic it simply just waits a couple of powerline cycles and takes another series of samples, this for me works really well. When I read up about PID for my own controller I didn't really understand it, so i just rolled my own code; I can't remember exactly how it works without checking the code but the thermal hysteresis for me was only an issue at the kilns lower temperatures, after the kiln got hot it wasn't an issue, so my code logic just switched to a different mode when the kiln hits a certain temperature. Not sure if that was helpful lol but keep up the great work!
  3. After reading this I created a simple Google Chrome plugin to convert ° F to ° C, it seemed to work on a very basic level but it wouldn't work for all formats like <number>F or <number> F/hr without lots more work. Also, it seems you can't create your own personal Chrome Plugins other than an unpacked version that gets removed every time Chrome is closed :( unless of course you cough up some money to Google to put it on the Chrome Extension store.
  4. Just an update on my controller project; recently I've been adding some extra features like; better programme management and allowing a thermocouple offset value; this weekend I'm going to try and add wifi to it so I can push real-time firing information online so it can be picked up remotely using a smartphone etc, not sure how that will go. [update] I created some c# code on my PC to talk to the wifi module using the modules AT commands, the calls worked out fine, so that part all works; after that I created a simple HTML page which will display potentially the LIVE kiln data into a graph. The graph is almost responsive but I need to tweak some sizes for better mobile device viewing. One of the pics below show the wifi module, these are very cheap ~£2-3 each; the graph pic just shows some dummy test data. The tricky bit now is getting the kiln controller board talking to the wifi module; i will need more coffee for that
  5. I will be making it available as soon as it's complete.
  6. yes, I totally agree. I do plan on carrying on with Parian but I need to sort out my kiln first; as it needs new elements and a new base to stand on before I fire again with it. I made a lot of mistakes in my model so i'd like to scrap it and start a new one. Oh, and I need to finish my diy kiln controller project too! there are just never enough hours in the day!
  7. This was my very first ceramic so it's really hard for me to make any comparisons to other materials, but I really do like to work with Parian. The pieces are Charlotte Brontë, Queen and Mandala. Although I like the finish, I was expecting a half-way between a smooth matt to a silky appearance, now whether that's the difference between 1200c and 1240c i've no idea; it would certainly be worth trying the upper temperatures with this version of Parian slip, also I suspect the thickness of material and the type of finish on the inside of the mould would also plays a big part in the overall effect.
  8. From the album: Misc

    © Copyright © 2018 Julian Cole

  9. The bearded man was my piece and the others were my father-in-laws.
  10. well, i don't feel so bad now. I had some controller issues yesterday so I had to swap out my latest (not properly tested) controller back to the old one, which meant I couldn't fire, BUT I did set it going this morning.
  11. 5 months later and I still haven't fired the pieces - lol; but now they are in the kiln and I plan to fire it tomorrow morning before I start work; I will let you know how it goes.
  12. A very aesthetical composition; I especially like the leaf spacing.
  13. tbh this would be my first guess; my wife has worked supporting students across the spectrum and the behaviour described does sound familiar.
  14. Hi, just some odd comments on your site; I would remove the "Not for technical info on clay/glazes/firing/safety etc.; no expertise is claimed." from the home page, as the home page should only be about your lovely images; perhaps just add it to your policies page somewhere. I'm from the UK, so conditions of sale is completely different to the states; I did find a nice page which outlines some basics, but what I gathered was, for the most part, it's determined by the state your selling from - so, you might want to touch on that maybe in your text. http://consumer.findlaw.com/consumer-transactions/customer-returns-and-refund-laws-by-state.html One good thing I like about your site is that it fits 1020px width which essential for being viewed by mobile tablets. ;-)
  15. interesting stuff! well, I would assume (hope) potclays comment means "over the recommended" temps. Anyway, assuming everything is good with the clay etc I will try some pieces at 1240c and also try some at 1200c. I might have to get another thermocouple before I fire so i'm dead on the mark.
  16. Hi @Sputty the Parian was sold ready mixed as a casting slip from Potclays.co.uk; a link to the product is here https://www.potclays.co.uk/studio/products/5288/original-parian-semi-porcelain-casting-slip-5lt I had read about the softening, I was thinking of hitting 1200c to maybe 1215c range to be on the safe side in case it went too soft and couldn't support itself (no idea to be honest ). If it works out I might well look at Scarva and source the raw ingredients; with some help from your great Parian topic thread :-) (which I will re-read tonight) Did you have any preferred firing profiles for Parian? I was just going to use a 2 segment stoneware and tweak the upper last segment to 1215c
  17. Hi, just a quick beginners kiln firing question; i'm hoping to fire some Parian sculpture this week in my kiln; i've never fired Parian before, can I lay the pieces down on their side to fill the kiln space better or will they mark or stick? Previously, I had laid my stoneware bisque fired pieces on their side and they came out fine. Regards Jules
  18. Hi, i've attached a PDF of the schematic / circuit diagram of my diy digital kiln controller so far; I will post a link to the firmware and other details once complete; I basically have to do some more LIVE testing before I'm happy with it. Current Progress Schematics
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