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I prepare to attach these by simply touching them to the top of the slip (it is sticky and coats the underside evenly). Then it is just a matter of setting it in place and and it glues down in seconds. I make these a little larger diameter than the top of the opening in the plaster mold (e.g. 2mm), producing a small overhang on the cast piece (this one has 0.8mm thick walls and prints quickly). During the time in the mold, the clay slurry creates a thickness against the plaster walls that also extends upward above the top (inside the spout). Shortly after pour-out I put these into the cuphead on the jigger wheel and make a cut and lift the spout away. This leaves an over-hang and over-height that enable finishing the rim using the jigger template.
Turn this upside down and center it over a 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 (click the link below to go straight there).
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 |
Pour Spout
Plaster molds intended for slip casting have a spare at the top to act as a reservoir. This enables overfilling the mold to accommodate the dropping slurry left. 3D-printed spouts make a spare unnecessary. |
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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