Monday, October 27, 2014
09 Plaster Production Molds Nº 182
Today I poured the third part of the mold for the upper leg. I have already cut the registration keys. I clamp the coddles around the mold as tightly as I can. I add some oil-clay coils around the inside edges to seal it. Click on any image to enlarge it.
I secure the mold to the mold table with some oil-clay coils. I will be using the mold table vibrator when I pour the plaster. If I don't secure the mold to the table, it will move around due to the vibration. I want it to stay in one place while I am pouring the plaster.
I apply the parting agent. I use a 50/50 mix of liquid soap and water. I apply the parting agent with an old paint brush. I pour the parting agent from the main supply jar to a small paint cup, and I apply the parting agent from the paint cup.
I weigh out two pounds of water in the mixing bowl. I always tare the mixing bowl to zero before I weigh the water.
I weigh out three pounds of plaster of Paris.
I quickly sift the plaster into the water. Always add plaster to water. I let it slack until it soaks up all the water. I push the island of plaster under the water and squeeze out all the lumps. The plaster is ready to pour when I can draw an "S" in the surface, and it leaves its mark. I turn on the vibrator which is attached to the mold table. I pour the plaster into the coddles evenly while the vibrator is running. This helps to release air bubbles. I turn off the vibrator. I leave the mold to setup for at least an hour.
I pour the excess plaster into the lined trash bag. I wash my hands and the mixing bowl in the bucket of water. Never put plaster (dry, set, or wet) down the drain pipes.
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