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About Mudlark

  • Rank
    Advanced Member
  • Birthday 10/11/1936

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  • Gender
  • Location
    Woodend Australia
  • Interests
    Aviation restoration
  1. Thanks for your response I now have something to follow up on.
  2. Has anyone info., about modifying an auto exhaust gas analyser for use on gas fired pottery kilns?
  3. Lapidery suppliers stock silicone carbide grit. I use 600 mesh as I have it on hand having bought it for another purpose, a coarser mesh would do just as well. Brazing rod is used to join metals by heat and can be bought at plumbing suppliers, use one that is not covered in a flux, it looks like brass rod. Any non ferrous metal rod of the desired diameter will do. Plasticene is a trade name for an oil based modelling clay used by sculptors and model makers not to mention school kids. It's used as it does not wash away with the cooling water as potters clay does.
  4. I use silicon carbide grit. Use a brass or copper rod of the desired diameter as the drill bit(brazing rod is suitable). Make a plasticene dam around the spot where the hole is to be made,add grit and water. Do not press too hard, replenish water as required and support the underside of the material being drilled otherwise the drill will break through leaving a ragged area around the hole. Repeatedly withdraw the drill to permit new grit and water penetrate to the cutting surface.Wear ear defenders and goggles.
  5. Taylor and Bull discuss thermal expansion in detail in their book Ceramic Glaze Technology, including a simple series of tests using an electric oven and water to determine the resistance to crazing of a sample glaze. Book details: Library of Congress Cataloging-in-Publication Data Taylor.J.R. Ceramics glaze technology Includes bibliographical references 1.Glazing (Ceramics) 2.glazes. 1.Bull.A.C 11.Title TP812. T39 1986 666'.444 85-29700 It is worth chasing up your local library to get this book on loan as it also answers many other questions that crop up when you experiment with glazes.
  6. Alice it looks remarkably like my first attempt and has the same fault - the spout is too low ! As I filled it up the water poured out. I still have it after 30 years to remind me to think things through, not that it always works but that is one of the attractions of ceramics there is always something new to learn. Mudlark
  7. Dunting is a firing/cooling fault and occurs at the cristobalite inversion temp of 226 deg C and at the siica inversion temp of 573 deg C, Dunting is not a glaze fault.It occurs in unglazed ware during both bisque and higher firings.It is one of the major problems to be considered when formulating flame proof bodies.
  8. Robert Fournier's Illustrated Dictionary of Practical Pottery ISBN9057034042 published by Craftsman House explains it quite well. For a more technical discussion you may try reading Chapter 6 of Ceramics Glaze Technology by J.R.Taylor and A.C.Bull ISBN0-08033465-2 or 0-08-033466-0 published by Pergamon Press. In practical terms you take the coefficient of expansion and move the decimal point 6 places to the left to give the rate of expansion per degree temp change. There is some disagreement for the values of some compounds in the Tables given by English and Turner and Winklemann and Scott which may be cause for confusion but potters being practical people just average them, which seems to work. Another source for information on this subject is Ceramic Whitewares by Rexford Newcomb, Jr published in 1947 by Pitman which may be available from a library.
  9. I'd like to amend the last few lines of this poem if I may:- "Listen to yourself child. Anything can be." Mudlark
  10. I have found the answer or at least the current method of applying the clay.It could not be simpler, it is is just daubded onto the rope and turned against the profile. With a little ingenuity a coil extruder could be added to the machine so that the process is a little less labour intensive. Back to the drawing board ! Thanks for the links "bciskepottery" they led to a satisfactory result. Mudlark
  11. If you open the following www.poterie-provencale.com you will get the familys' web page which opens with an intriging micro second flash of the process in operation. But it is of so short duration that it is immpossible to see any detail. I've tried searching for greater detail but to no avail. The Louisiana link is interesting but I have not been able to find anything about it. It looks like I'm in for a period of trial and error.
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