How To Make A Two Part Plaster Mold

A plaster mold for ceramic slip casting because there is no give at all in the material you must find the part line of the shape that will allow the two mold pieces to pull apart and the model or cast to be released free of undercuts. Once you feel you have submerged the lower portion of your object to its approximate half mark smooth the top surface of the clay as much as possible before moving on to the next step to make a mold. A mug with a handle is a good example of this.

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To demonstrate the process for the instructable i have chosen a sea shell since it is an object that cannot be duplicated with a one part mold system but is very streamlined it lacks advanced features such as.

How to make a two part plaster mold. Carefully find and mark the parting line on your object with a marker. Wrap aluminum flashing around the prototype to serve as cottle boards leaving a 1 2 inch gap between the flashing and the edge of the clay form the flashing creates a barrier to contain the plaster once it is poured onto the prototype 3. Mold making casting chicago presents. Second video of making a 2 part plaster mold for soft plastic baits.

Obviously i m not very professional when it comes to ceramics i m just out here having fun and doing my best. The advantage of a two part mold over a one part where molten material is poured into an open mold is that much more structurally complicated objects can be duplicated in this way. Accurately create your parting line with water clay. Another reason to use a two part mold is if you want to make a rigid mold of a model with undercuts i e.

Long video but i go step by step. For a 2 part mold layer the bottom of the mold box with clay and push the object into the clay leaving 1 2 of its height exposed for molding. Thanks for watching y all. How to make a plaster mold for slip casting part 2.