Mould making done simply, efficiently and effectively. The First phase of mould making. Splitting the prototype, taking care of undercuts . Building the divisions (Leather-hard clay slabs) - determined by the number of sections to be moulded. I normally secure the prototype in a clay slab to ensure no plaster penetrates below the prototype and it also provides support to the extruded plastic sheeting (to hold its shape - determined by the thickness of the plaster walls).
Preparing the mould casings - using extruded plastic sheeting and the ever clever cable-ties to hold the casing together; ensuring no plaster escapes the casing. Soft soap is applied and left to dry to ensure that the moulds seperate from each other.
Poring spouts are attached before casting the final pieces normally the bottom that contains the opening (pouring spout) for slip casting.
The moulding process is complete - the prototypes removed and moulds refined before drying. The keys that holds the pieces together are done with a large coin held at an angle and turned scraping the negative circular form as seen in the above image.
The completed moulds and prototypes - ready for drying. The tail was cast during the previous moulding process and ready for slip casting.
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