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Found 6 results

  1. Hi all, I'm new in this forum and would appreciate some wisdom on figuring out shrinkage rates. I'm working with Laguna B-mix Cone 5, which as per Laguna has: Avg. Shrinkage 2±%: 12% Avg. Water Absorption 1± %: 2.3% COE x 10-6: 5.74 (note: no idea what COE is. Do you?) Now, what exactly is this 12% shrinkage? Is it the shrinking after both bisque and glaze firings? (I bisque at cone 06, glaze at cone 5). What is the shrinkage from wet to bone dry then? Does this mean, for example, that if I want the drain hole in the sink I'm trying to build to be a finished size, that is, after glaze firing, to be 3.175 cm (which is 1 1/4", I'll use cm since it's simpler for calculations, being decimal and all...), at WET (plastic) stage the hole will need to measure 3.60 cm, where 3.175 cm is 88% (100% - 12% shrinkage rate) of 3.6 cm? Am I figuring this correctly? Where does the 2.3% water absorption rate come into play? Is that the shrinkage that happens from plastic/wet stage and bone dry? If the posted avg shrinkage rate is 12%, how much of that shrinkage happens after the bisque firing and how much after the glaze firing? What happens if, for example, I need to do a second glaze firing, will it shrink even more? And what happens if that second glaze firing is not at the same temperature as the first glaze firing, let's say it's for decals at cone 012? I need to be really accurate for the pipes and hardware to fit correctly on this sink. I'm confused. I'll thank you in advance for any light you can shed on this for me...
  2. Post removed under agreement. Published in Ceramics Monthly. Nerd
  3. I am wanting to try and make sets of measuring spoons. I figured I would use a manufactured set as size references when creating them, but I am not sure how to account for shrinkage in the kiln. Never having made something that needs to have an exact (or close) size I am wondering if its that big of a deal and something that needs to be taken into account or if I should just say 'whatever, I'm sure they will be close enough'. Anyone have any thoughts, ideas, tips, from experience??
  4. Looking into making my own climbing holds for an indoor climbing wall at home. From what I understand they have been made. I just need to figure out the shrinkage of my clay so that the mounting hole is a standard 3/8" like commercially made resin holds. I vaguely understand the concept of shrinkage calculation. Roll a slab the same thickness as your finished product, mark with a ruler 10cm, fire at temp and then check against the original ruler for % shrinkage. Do I just increase the desired hole size by the % and voila? Or is there something else to it? Thanks for any advice.
  5. I've been trying for months now to make a successful octopus that the tentacles won't break on! I'm starting to think I can't! I'm make the tentacles with clay coils and add details. However, when it starts to dry, the tentacles start to raise up. They don't break...but me trying to readjust them or press them back down breaks them. I feel like an octopus is going to look DUMB with his legs in the air!! So here's what I'm doing right now: I've got his body uncovered (so it will dry out...the tentacles are thinner and always dry out fast) and his legs have been misted with water and have a plastic bag draped across them. For weight to counter the rising tentacles, I've laid a cotton t-shirt on top of that. I keep checking and misting...but this seems like a never ending cycle. How do I keep these legs from dring and raising up?!?!
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