Form "lid"
This is the form "lid" showing the layers that make up the rough parabolic shape. Since this is a negative mold, the parabola bulges out, not in. In order to reduce the amount of material removed during the turning process, a very rough parabolic shape was constructed with layers of material. Look closely at the top edge on the left side: I have added a parabolic curve to demonstrate where the actual surface will be once the cutting process is finished.
Form "lid"
This is the form "lid" showing the layers that make up the rough parabolic shape. Since this is a negative mold, the parabola bulges out, not in. In order to reduce the amount of material removed during the turning process, a very rough parabolic shape was constructed with layers of material. Look closely at the top edge on the left side: I have added a parabolic curve to demonstrate where the actual surface will be once the cutting process is finished.