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T Paulsen

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  1. Carving tufa for casting..

    Additional notes I found on the web years ago. unfortunately I do not know of the source anymore. 1. 1 Stone Preparation - To begin making a piece of tufa cast jewelry you start by cutting a piece of tufa stone to the desired size that works best for your design. After the stone has been cut to size you must rub two sides of the stone together to create two sides that are perfectly flat and fit flush together. 2 Create of a Design. After the stone is ready for use, a design is sketched directly onto it. 3 Carve the Tufa Stone. The design is carved into the stone with hand chisel tools, wood files, sewing needles, paperclips and other tools. A dremel can be used for removing larger amounts of material. The carving must be done with perfection. Once a part of the stone is removed, it cannot be added back. The areas of negative space become the positive space where the silver fills in and forms the piece. Any mistake can render the stone as useless. You must add a sprue hole at the top of the rocks to allow the silver to be poured into the mold. It is also important that you carve air vents that go from the design all the way off the edge of the tufa stone. This will allow for air to escape as the silver is poured in. 4 Carbonize the Tufa Stone and Melt the Silver. It is essential to have the tufa stone carbonized before pouring the silver. This can be done with using just the gas of a torch without the oxygen. With the two parts of the stone covered in soot and bound with a piece of rubber or clamps add the correct amount of silver into a crucible and melt it with a torch to a molten state. Pouring only takes a moment, and if done correctly should fill the entire mold. 5 Sand and Clean the Cast Silver. The silver piece is removed from the mold and the extra silver in the sprue hole, not a part of the design, is cut from the piece. Sanding cleans and smooths the design, but the texture that is distinctive to tufa cast work is left where desired. This is the beauty of this form of casting. There may be smoothed sections that are created to provide contrast with the texture left by the tufa stone. Links that have been soldered together should also be individually sanded to make for a seamless link of silver. The piece can also be cleaned in a citric acid pickling solution to remove any fire scale caused when casting or soldering. 6 Polish. Polishing can be done with water and a rubber wheel or it can be done using polishing compounds. There is pre polishing compounds. Cut and finish compounds and final stage compounds. They can range from abrasive to non abrasive. 7 Complete the Work. The final stages of creating a one of a kind piece may include various methods in order to set stones, create unique forms through the melding of multiple tufa cast silver pieces, adding links to connect pieces, or implementing whatever other inspiration comes to mind. Sanding and polishing a piece can be very time consuming. Depending on the piece of jewelry it can be up to forty or fifty percent of the work.
  2. Carving tufa for casting..

    Tuffa mold notes From Del Orr, Orr's of Taos 6-26-2012 When using Tuffa molds pour 6 -10-12 of the casting then let cool, mold will last three sesions, pour one casting let mold cool and repeat, mold will still only last three sessions. Before casting brush mold with kerosene, then close and cast, provides reducing atmosphere. Be sure sprues are large enough, and that mold is well vented!!!!!
  3. Carving tufa for casting..

    You want the volcanic ash to use for tuffa casting. It is available form Indian Jewelers supply. I have not yet done any tuffa casting but an elderly gentleman I am acquainted with advised me to paint the mold with Kerosene before casting. He said I would get about ten uses out of the mold, and could make multiple casting every time I used the mold. I will look for the notes I took when I talked with him.
  4. Classes, Schools, Teachers

    All ready into lapidary and faceting, looking for design guidance, and any additional info that might come up.
  5. Classes, Schools, Teachers

    looking more for the kind of carving that Henry Hunt discussed in his books nowhere near faceting. TP
  6. Classes, Schools, Teachers

    Thanks for the reply, Have visited the Old Pueblo Lapidary Club, and no one there knew of any gemstone carving classes, there is one famous carver in the area but they do not like to teach. Any additional suggestions TP
  7. Classes, Schools, Teachers

    Are there any classes available in the Tucson, AZ area? Interested in freeform gemstone carvings. Any other resources that might be helpful? Thanks TP
  8. Greetings From The Mojave

    On the rock tumbling hobby group they discuss using a brake bleeder hand pump and a bell jar to draw the vacuum to stablize small amounts of material.
  9. I am in the process of learning gem stone carving, have been practicing on obsidian and other misc materials found in my buckets of rough. Took a lesson to learn the basics, a three fluted free form cabachon to learn how to use the machine and get introduced to the process of carving with diamond points, and polishing with diamond grit. Does any one have a series of projects that would walk a person through the process of carving increasingly complex patterns to advance their skill set? Thanks TP
  10. Can anyone on the forum offer advise on building a single point carving tool. what size chuck is needed how fast does the tool run and any other advise on its construction. Thanks TP
  11. Materials Swap

    I would like to build a similar machine, can you offer any advise what size of motor, what speed do you run it at do you need the morse taper chuck, and any other advise you might have on building a carving machine. Thanks T P
  12. straightening antler

    Can deer and elk antler be straightened? I am making knife handles and have cut out all of the good straight sections in the antler I have available. Any suggestions Terry
  13. Making Antler and Ivory Beads

    You might want to go to this site, has a tutorial on stone beads, and how he makes them. Used this technique for a few jade and common opal beads last year for Christmas presents here is the link http://www.lopacki.com/howto/
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