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The multi-use grey outer rail on the left was printed in two parts and glued together (at the shoulder). Its vertical split enables me to open it a little. The center model of the outside contour of the mug (on a two-step base) was made by casting the plaster inside another two-piece 3D-printed form I had made (we had to use a heat-gun to get the PLA printed form off of that plaster). I smoothed the surface on the wheel using a metal rib and trimming tool. Then I stretched a rubber band around the first step at the bottom (because the rail was a little lose-fitting), it fit perfectly and clamped tightly in place. To cast a plaster jigger mold it is just a matter of soaping the plaster model and the inside of the rail. One improvement this needs: I 3D printed ring that drops down to the shoulder to force it perfectly round.
Turn this upside down and center it over a precision plaster or 3D printed form of the outside shape of a mug. This creates a mold that drops down in our Shimpo cuphead. This opens slightly along one side for easy release from the plaster after set. It is held together by paper clamps during use. The upper flange can be glued down to a smooth surface with a clay slurry. If you would like this 3D file in Fusion 360 format, it is available in the Files manager in your Insight-live.com account.
Glossary |
Casting-Jiggering
A process in ceramic production where items are slip-cast first and then finished using a jigger wheel. |
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Glossary |
Side Rails
Side rails are the containment used when pouring plaster molds. We 3D-print these to custom fit each mold. |
Glossary |
Jiggering
Jiggering is a process of forming pottery that employs a spinning plaster mold and a tapered template to press soft clay or porcelain against it. |
Projects |
2019 Jiggering-Casting Project of Medalta 66 Mug
My project to reproduce a mug made by Medalta Potteries more than 50 years ago. I cast the body and handle, jigger the rim and then attach the handle. 3D printing made this all possible. |
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