Moulding Part Two Evaluation

Moulding part two is done to achieve a negative mould of the product which has been sculpted. Once this is complete, one is left with a two part mould, a positive mould of the models head and a negative mould of the sculpt. This process included the use of clay and plaster and was a rather fast exercise. It is important to complete this step as once this has been accomplished, casting the appliance can be conducted which is done by pressing the two moulds together.

An overflow was made with clay which then created a cutting edge. This was constructed well around the edges of the sculpt which was later found extremely helpful once the appliance was cast. Before the moulding began, a work station was set up neatly to allow me to access products quickly when needed. This showed good organisation and preparation skills. The demonstration was followed correctly which demonstrated good listening skills and the ability to follow instructions. The exercise went well. 

Although all the instructions were followed as described, once the first appliance was cast, both moulds began to crack which meant that this would be shown in the detail of any further appliances. This also meant that the moulds may not stay solid when casting the appliance again. It was understood that the cause of this was due to the plaster not being thick enough which meant a ratio of water to plaster should not be 1:2.5 but perhaps 1:3.5. A new batch of plaster with the new ratio was made up and added around the outside of the negative mould and to the edges of the positive mould. Burlap was also encountered to assure the moulds would stay stable. This demonstrated problem solving skills. If I was to complete the task again, I would make sure the plaster was thick enough by adding more plaster to water and would add more to the moulds.