Monthly Tech-Tip | No tracking! No ads! |
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.
Available on the Downloads page
This picture has its own page with more detail, click here to see it.
This enables casting a plaster mold that drops down in our aluminum jigger wheel cuphead. The critical measurement is the 73mm radius of the step where the mold sits inside the cuphead (this must be adjusted to your cuphead). To use, turn this upside down and center it over a plaster or 3D printed form of the inside shape of the vessel. The outfacing flanges enable this shell to open enough to release from the jigger mold being cast. Using paper clamps it is held together, and held down to, a clamping baseplate (having 86.2mm radius, it is a separate drawing). To assure that the mold seats well into the cuphead and rotates true, adjust the inner radius of the spacer ring and print it.
Glossary |
Casting-Jiggering
A process in ceramic production where items are slip-cast first and then finished using a jigger wheel. |
---|---|
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 level. 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. |
Buy me a coffee and we can talk