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Karen B

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Everything posted by Karen B

  1. I have a large plastic rain barrel which I fill with the hose right before we turn off the spigots for the winter. I've been using this for 10 years. Water is always nice and clear. It is pretty much sealed except for a plastic screwed in plug on the top and a spigot on the bottom with a mini hose. I thought this was temporary, but turned out to be all I needed.
  2. Look at the thermal conductivity number for the material the shelf is made out of. That is a measure of how "fast" heat energy will tend to penetrate the shelf. Look at the specific heat of the material the shelf is made out of. That number indicates how much energy it takes to heat the shelf material itself up. Look at the combination of specific heat and overall mass of one shelf relative to another to compare them. That will tell you more about how much energy is going into the shelf to heat it up... or how it will tend to slow down the cooling. best, .......................joh
  3. Wondering if the corelite or advancer shelves heat and cool at a rate that is closer to the heating and cooling of the clay? I have issues with this on standard shelves when firing large flat platters or tiles.Solutions have been previously discussed for raising platters off shelves, but not whether changing shelves will help.
  4. Yes, Mark, I did mistype "80" mesh. Thanks Norm for the source of information.
  5. As a follow-up to the problem with my hardened zinc: I put about 6 very lumpy cups of the zinc oxide in a heavy previously fired pot . I heated it to 700 degrees and held for 20 mins. After cooling enough to open, I found that the lumps broke up, but was not fine enough to mix in a glaze. It would never pass through the 800 mesh sieve. I tried sifting out the finest particles, but realized that I would never get the 2000 or so grams I would need. I commandeered an old coffee grinder from the kitchen and found that it did the job. It quickly made the zinc into a fine powder.
  6. Thank you so much! I am happy if I don't have to add the labor of mortar and pestle though.
  7. My 50lbs bag of Zinc Oxide which is about 3/4s full has become hardened. I tried using some in a small glaze mixture by putting it in the blender but it did not work. Is there any way to salvage it?
  8. Dear Marge, I have gone to great lengths to make slip using Robin Hopper's recipe. People in my old studio laughed that I was taking dry ingredients and making slip in this manner. It was, however, great slip and stuck to everything. I think if you google his slip recipe you should be able to find it on-line or at the very least in one of his books. Now however, what I do is take some of either my reclaimed clay or cut off slices of the clay body I am using, dry it throughly, put it in a bucket with some water and let it slake. You don't want to add too much water but just enough to r
  9. In addition to these helpful comments there may be times when you want to do a little wedging. What I did after healing from carpal tunnel was readjust my hand position so I do not bend my wrists. Most of the pressure goes to the inside of my thumb pad. Good luck with healing.
  10. I did what most here do, pushing a bit at 300, taking plugs out etc... Then one day at about 250 degrees, I got to the shelf with the porcelain mugs, (the rest of the pieces were stoneware) and they had all shattered from thermal shock. Since then, I leave it until it is room temp.
  11. I was told by Amica in Massachusetts that they will not cover any equipment in my home studio, which is an attached garage. I found this out when I called Amica to find out about insurance for a craft show. The agent then proceeded to hound me about my kiln (electric) and studio. I had to call her supervisor to get her to stop calling me. I think she was new and trying to make a name for herself or something.
  12. Thanks for clarifying this. I had always left the vent on until 500 degrees for fear of melting it. Now I will turn it off sooner.
  13. Been making pots for 30 years this year (2011)!

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