As soon as the struts are properly fitted, we will tap and add the threaded studs and they will be ready for silver plating.
Restoration of Speed Record Trophy
78 year old trophy presented to Stainforth in 1931
After the mold has the wax and moisture removed in the kiln, bronze is melted and shot into the void in the mold by means of centrifical injection. In Photo # 6 you can see the molten bronze glowing bright orange.
After the bronze cools, the stainless sleeve is removed and the white mold material is desolved leaving the raw casting with sprue and button as seen in Photo # 7
In Photo # 8 after cutting off the sprue and button, the strut is sanded and final fitting to the trophy takes place. When all four struts are fitted these struts will be polished and silver plated.
In Photo # 5 the mold has been put into a Kiln to melt out the wax, leaving a hollow cavity in the shape of the strut and sprue. This also removes all moisture. Note the red glow of the stainless mold cylinder.
As mentioned before, first you start with a chunck of investment wax, draw an outline on it, cut the basic shape, carve and finish to the final shape as shown in Photo # 1. Next the wax strut is attached to a sprue and mounted on the mold base, Photo # 2. A stainless tube forms the outer shell of the mold in Photo # 3.
The mold is filled with a material similar to Plaster of Paris that surrounds the part and is filled to the top of the mold. In Photo # 4 the mold has been removed from the mold base, turned upside down to reveal the wax sprue and button hollow.
