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Bill Kielb

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About Bill Kielb

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  • Location
     United States - Illinois
  • Interests
    All forms of constructionist pottery, education, analysis, design and repair as it pertains the ceramic arts community.

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  1. This usually works but in thermocouple world is strictly not allowed as each connection becomes a couple because of the dissimilar metals. It all depends on the sensitivity of the equipment and of course the condition of the couples that form inside and outside the switch. In theory since at the same temperature they will be equal and offset. If your controller is sensitive, this might not work. A standard I type plug in might be just as easy and it is made for swapping. Just put male ends on the kiln tcouple and a female in your device that way everything is designed with tcouple matching met
  2. These both look well thought out. Some potential ideas for you Protecting SSRs Protection for SSRs (If you are interested in protecting) generally requires fast fuses which the manufacture will list the requirements for based on their design components. Cooling: When we design with SSRs we try and use passive cooling rather than a fan. To That end in the states I have always been able to fulfill the need economically and in a custom fashion at https://www.heatsinkusa.com/ I am sure there are plenty of other extruded aluminum sites around though. An interesting thing
  3. That could mean you prefer the pin approach but often to make seams disappear between different sections often leads to obvious visual segments using pins and attempting to make the joints perfectly mate. They generally won’t in color, texture or shape after firing. @Pres is spot on with planning. Many larger pieces I have seen were produced in sections but the transitions were planned to be pleasing to the eye and disguise the obvious transition. Reliefs, offsets, undercuts all with texture changes are common techniques to make obvious transitions near invisible.
  4. Yes I have done that and it works. Balloon gets to be a mess though. For the most part I can spray around pretty cleanly do it without the balloon. Just lazy now days. Lots of practice spraying cars, boats, motorcycles when younger. Occasionally can make a mistake though.
  5. When throwing you could make stackable with alignment tabs / reveals, holes for alignment pins. To make semi permanent I have seen holes for screws that match up to holes where a wooden plug has been installed. Blind hole toggles, epoxy ..... just some ideas that may spark your ideas.
  6. The copper red part will require reduction or use of different oxides to mimic copper red. Post a picture of your desired result here with the desire to fire cone 10 oxidation if that is still the case as well as the celadon look you are trying to achieve. You will likely get some great suggestions. It’s fairly hard for folks to comment or speculate without a picture
  7. Maybe .......... in reduction you are looking for a way to set up favorable conditions for something to gain electrons, hence reduction reaction. If you are firing cone 10 with fuel then carbon monoxide is your friend and only a handful of oxides are affected anyway so learning how to achieve and hold a level of reduction is the challenge. If you are firing cone 10 in an electric kiln, it will be very hard on the kiln elements decreasing their life to 25% or less than cone 6 so I suspect you will not do that for long. SIC can potentially get you local reduction, but defining exactly what you
  8. Cone 10 is a thing because that is where the earths geology melts. So all glazes really sort of start as cone 10 and we have found ways to make them melt at cone 6. We make things melt earlier by having less alumina and silica, more fluxes, some special flux combinations, often zinc and one of the most popular - the addition of boron. So most glazes in my mind start as cone 10 and we use techniques to get them to melt at cone 6 or lower. With that in mind, I think it’s easier to go from cone 6 to cone 10 but also would add you should be able to go on Glazy.org and find plenty of cone 10
  9. They all look nice! 1/4” wide real automotive pinstripe tape is super easy to use btw. Being lazy I have resorted to pouring out the inside and cleaning that edge as practical with a sharp tool. Then spraying the outside of the mug controlling my spray as I go. I can get a pretty decent transition with a bit of care.
  10. I have a scale that measures to .001 g but it’s hard to use with the slightest breeze and my item being measured constantly blows off the scale.
  11. 100 g of dry mixed glaze will become prox 140 grams of liquid glaze, but close enough. So for very rich sodium water I get to enter .02 g of sodium. How much would I expect that to change the chemistry of my recipe?
  12. Agreed! When it can be quantified and entered into a glaze calculator then maybe it will have a significant influence. How many grams of sodium is 200 ppm in a 100g test glaze?
  13. Hmm, all may be true but if the interior surface (radiant) actually is larger than the exterior surface unless cooling by convection it’s definitely can be more complex for sure. Energy movement by radiation is pretty straight forward and very fast. Most open top vessels have a radiant inside bottom surface which could actually create more interior surface than exterior. Mass of the bottom, contact and conduction through the shelf ........ all complicate things greatly. I am not sure there are any absolutes here. As far as the speed of conduction, I suspect its fairly high and for normal thi
  14. I don’t but that would be a perfect task ! Need to work an oxygen probe in there as well to cover Liam’s thoughts. Neil might have someone from his advanced class with interest.
  15. Sounds crazy but maybe include thin walled, medium walled and thick walled. I have a hunch that most cups and bowl surfaces are fairly even overall as the exterior has slightly more but the interior includes the bottom as radiant so overall potential cooling surface might be greater inside than out for open shapes. This may end up as a mass issue actually, or at least that could have a big influence. Seems like a cool useful experiment.
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