Archive image from page 52 of Deep submersible logistic support design. Deep submersible logistic support design concept. deepsubmersiblel00byrn Year: 1972 FIGURE 3. CHRISTMAS TREE ORNAMENT AND TWO INCH SPHERE MOLD To produce better quality porcelain spheres of various diameters, more precise equipment was assembled, using the facilities of a machine and mold shop. The following section explains the assemblage and manu- facturing details in further detail. 2. Description of Sphere Molds To obtain finished spheres of good sphericity required a mold of the same quality. Solid aluminum spheres w
Archive image from page 52 of Deep submersible logistic support design. Deep submersible logistic support design concept. deepsubmersiblel00byrn Year: 1972 FIGURE 3. CHRISTMAS TREE ORNAMENT AND TWO INCH SPHERE MOLD To produce better quality porcelain spheres of various diameters, more precise equipment was assembled, using the facilities of a machine and mold shop. The following section explains the assemblage and manu- facturing details in further detail. 2. Description of Sphere Molds To obtain finished spheres of good sphericity required a mold of the same quality. Solid aluminum spheres with diameters of 2 1/3, 3 1/3, and 4 1/3 inches were machined and polished to 1/1000 inch accuracy. The oversize diameter required allowance for plaster mold and porcelain sphere shrinkage when completely dried. Using the solid aluminum sphere pattern, plaster molds were poured. After several trial-and-error attempts, good molds were produced. Three molds of each diameter were made; Figure 4 shows a four inch mold. Note that it was made in two interlock- ing halves with a pour hole centered in one hemisphere. 25
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