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Tyler Miller

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Tyler Miller last won the day on September 17

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About Tyler Miller

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  1. Okay, let's put this all to rest. Firstly, I think the word you are looking for, John and Neil, is information. Equivocating information and data is false. All data is information, but not all information is data. A glaze recipe and UMF provide, and come from, the same data, but not the same information. A good parallel example would perhaps be Roman vs modern Arabic numerals. The Arabic decimal system makes apparent mathematical associations not otherwise accessible in Roman numerals. The number is the same, how you work with it is not. Modern arabic numerals provide additional arithmetic information which otherwise has to mentally supplied. The same is true with Leibniz vs Newtonian calculus notation. A % by weight of oxides analysis gives the same data as a UMF, but the UMF provides additional information--the molarity. This makes things like lithia easier to account for since Lithium is literally the lightest metal. Now, to get back to Pieter, John, and Dick's point. Running scads of UMF calculations through a simulator is to my mind useless. The information gained is merely didactic (i.e. an expression of second hand knowledge), and such "hands-on" training is not so much hands on, but learning by rote. Test tiles are superior for this kind of learning--for me. If you feel this isn't the case, that's fine, de gustibus and all that. But it's not gaining first hand knowledge, and certainly isn't a means to test hypotheses. It aids in interpretation, but itself is not a test. As such, I don't feel it's useful or necessary to run loads of tests through, just a few empirically significant ones. This gets to my point that there's nothing you can do with a glaze sim that you can't by hand. By hand, it's a question of being good with the necessary math skills--some aren't for everybody and that's fine. Factoring, trig, and calculus aren't for everyone either. No stigma there. As for my preference for by hand. It comes down to this: glaze sims are buggy, ugly, inelegantly coded, and non-intuitive to use. That's my feeling. I also don't like that it's difficult and problematic to input my own ingredients into some. And my own feeling is, if I'm not doing original glaze research, there's no point in glaze calcs at all. I should just get a book of recipes and call it a day. I also have a tendency to want to own my own mistakes and not be beholden to those of others. And even the best glaze calculators out there are riddled with them. Some not so insignificantly. So, to summarize, not all information is data, but all data is information--though not necessarily useful as such. Spectroscopic data on mineral composition expressed in something absurd like Ångstroms is of no help to me, although latent within that raw data is useful information. Glaze calcs by hand are in no way inferior to those by machine. And I'll bet a whole pile of dead potters would agree with me on that. There aren't many conclusions to be made from running scads of glaze calcs. Original research can be harder with some programs. And the errors aren't your own. Glaze calcs are also not necessary at all to make good glazes--a recipe book and test tiles work for the vast majority. I think everyone here is an artist first, ceramic engineer fifth or sixth (if at all). You may have your preferences and I respect them, but I think the truths behind mine are valid. You're also not going to trip up a classical philosophy guy on the nature of data. peace.
  2. Neil, my understanding is that data isn't derived from analysis, but is the thing analyzed. The raw recipe is the data, the UMF a form of notation to facilitate analysis. (x + y)^2 and x^2 +2xy+ y^2 are the same thing, but one facilitates a easier math. The same is true in chem. 2 g of a substance plus 8 g of a substance = 7.5 g of a new substance and 2.5 of a new substance can be expressed more generally as: x mol substance + y mol substance = w mol new sub + z mol new sub Datum/data means "a given thing/things." The raw material by which is worked on. I believe your above definition supports that, though perhaps ambiguously. Especially iay the final definition--data is the basis of calculation.
  3. χαλεπὰ τὰ καλά

    1. LeeU

      LeeU

      Say what?????????//

    2. Tyler Miller

      Tyler Miller

      It's from Plato -- difficult/hard are the good/noble things.

  4. Pieter, It's not as bad as you think, but I will say it's a skill kindof like factoring or picking prime numbers out of a series. Not necessarily intuitively learned. A lot of mid-20th C academic publications, pre-glaze software, presume the skill.
  5. John, I'm not sure I follow what you're saying. Maybe I should ask, what data beyond being a convenient form of comparative notation does a UMF provide? Since otherwise we're in complete agreement, that firing schedules and material sourcing matter as well.
  6. John, I don't find UMF formulas to be data, per se--or a means of producing it. They strike me more as a useful form comparative notation. Test tiles are data, formulae are expressions of that data. Like, if I'm doing line blends, I'll do the formulae for the significant ones (either epic fails, nearly theres, or dead ons), but the data doesn't come from the formulae. Like, I know that the high calcia in the glaze example I provided gives it a narrower firing range. But the formulae don't provide that, the testing does. Conclusions come from the tests, formulae just express it in a comparative way. The implications of whether I use wollastonite or flint and whiting doesn't show up in the numbers. And the math isn't what tells me what makes a stable glaze, someone's experience does. And playing in the wiggle room doesn't take that much effort. writing out the above formulae took less time than the accompanying text.
  7. Raku Question

    @Marcia Selsor It's a particle size thing, I think. Coarser clays do better.
  8. Hump and Slump Molds

    Corn starch can work as a release. Need the plaster bone dry to release otherwise.
  9. Similar stuff. They gave 2 mg per day of copper to infants for a little while with no effect. I'll post the abstract under this when I find it again. Edit: 2mg per day was incorrect, they studied water levels of 2mg/L as safe for infants (just below taste threshold--as established by above studies). https://www.ncbi.nlm.nih.gov/m/pubmed/9523857/ "Conclusion: No acute or chronic adverse consequences of consuming water with copper content of 31.48 micromol/l (2 mg/l) were detected in infants during the first year of life. The results support the safety of the World Health Organization's provisional guideline value for copper in drinking water during infancy." Cobalt--the evidence of its toxicity is pretty low in the chronic, leached-from glaze situation. Slightly different thyroid hormone levels (the zinc silicate grinders from the WHO summary) elevated red blood cells. It's not like lead where IQ points are shaved off and studies about increased criminality exist.
  10. @neilestrick I sortof took it as implicit that glazed wares were the topic of discussion. I can see how the ambiguity might arise. All sources were regarding glazed wares, except the WHO which does provide air quality standards for workers. I'll edit my original post to reflect that.
  11. You can do this too by hand--the steps can be reversed if you have known or desired values and work back to ingredients. Usually pretty easy. Just simple algebra. I agree with you that testing's the only way to be sure. Heck, even manufacturer's analysis is sometimes wrong--custer spar, e.g.
  12. Raku Question

    I should say that white stoneware doesn't work stellar for raku. Porcelain (actual, proper porcelain--the no ball clay kind)will work, but white stoneware has never worked for me.
  13. Dipping Bisque into Clear Glaze

    Glaze crawling can be caused by a lot of factors. In addition to what Bruce has mentioned, I would look into glaze thickness, whether it's flocculated, and drying times. The bubbles suggest to me the glaze was maybe applied too thick?
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