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Success: My homemade cone 6 is bending the same as the Orton

This is recipe L4532D. CAD files are available in the Files section of your Insight-live.com account so you can 3D print your own cone molds or shell molds. Pressing into the 3D printed PLA forms is potentially much faster and easier if it can be made to work. The issue is that the pointed ends are quite delicate and either crack in the mold or break during handling. The uneven thicknesses require special techniques to prevent cracking or warping during drying. The casting process is working better, the cones are more durable and drying is not an issue. Mold release has been a problem but we are finding that using ball clay instead of kaolin produces a better casting and releasing slurry (for example, the L4532F recipe).

Two pyrometric cones

Related Pictures

Make your own pyrometric cones? Why not!

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Pyrometric cone mold

Supply chain problems are hitting everything. Even cones. It turns out one can make these! The shape of a self-supporting cone is easy to draw in 3D (I did it here in Fusion 360). It is a 25mm equilateral triangle base lofted to a 3mm one 65mm straight up on the front side. And then a cut-out across the front. By using 3D printed press molds and plastic clay I can press these by the dozen. What about a recipe? Cones melt short of being glazes but beyond being porcelains. I chose L3685Z3 engobe as a starting point, it has a linear vitrification curve spanning a wide range. Approaching this on the material level, not as a chemistry project, I did three iterations of adding Ferro frit 3110 to the engobe. Shown here are the second, "A" and third, "B" (on the right is an Orton cone 6). B has too much frit, A does not have enough. You likely guessed what I did next: Mixed A and B. The result was almost perfect, bent just a little too much. If you would like this 3D file in Fusion 360 format, it is available in the Files manager in your Insight-live.com account.

3D drawing to print shell mold to make plaster pyrometric cone molds

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Pyrometric cone mold

Print these three, pour plaster into them (after soaping) and you have a cone slip casting mold. Part 2 has a separate upper to enable printing it upright without support structure (producing a much higher quality surface). Hold that top cap on with a rubber band to cast. The separate cap also makes it easier to extract the plaster mold after set. If you would like this 3D file in Fusion 360 format, it is available in the Files manager in your Insight-live.com account.

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Projects Make Your Own Pyrometric Cones

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