|Monthly Tech-Tip |
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 (e.g. 2mm) in the plaster mold, producing a small overhang on the cast piece. During the time in the mold, the clay slurry creates a thickness against the plaster walls but also extends upward above the top of the mold (inside the spout). A while after pour-out I am able to make a cut and lift the spout away leaving an over-hang, over-height and thickness that all play to enable jiggering the rim to the exact contour I want.
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.
A process in ceramic production where items are slip-cast first and then finished using a jigger wheel.