Table F-2. Summary of Dimensional Measurements 

 (Measurements performed on NEMO capsules 1 , 2, and 3.) 



Specimen 



Type of Measurement 



Acceptable Range 

 (in.) 



Test Results (in.) 











Maximum 



Minimum 



Discs prior to forming 



thickness 



2.375-2.625 



2.600 



2.385 



Pentagons after forming 



thickness 



2.315-2.685 



2.653 



2.315 





chord length 



37.970-38.030 



38.020 



37.858 





radius (sphericity) 



33.000±0.125 



33.100 



32.950 



Completed spheres 



diameter 



65.750-66.250 



66.100 



66.020 



After assembly and bonding of the pentagons into three capsules, 

 their diameters were checked at 1 6 locations and were found to be within 

 the 65.750<D< 66.250-inch specified tolerance for external diameter 

 (Table F-2). The external sphericity was so close to its nominal value that 

 the spheres actually could have met with ease the much more desirable 

 66.81 5<D< 66. 125-inch tolerance. Since this much tighter diametral 

 tolerance can be apparently met with ease, it is recommended for future 

 capsules. 



Visual Inspection of Joints 



After all the dimensional measurements were completed, the joints 

 (Figure F-2) were visually inspected for undercuts and presence of bubbles. 

 No undercuts were found in any of the joints. Mismatches of thickness were 

 found across some of the joints in the sphere's interior, as could be expected 

 between pentagons of slightly varying thickness. Since all the variations of 

 thickness in pentagons were previously found to be within specified thick- 

 ness tolerances, the mismatches across the joints were accepted as natural. 



The number of bubbles in the joints was found to be drastically 

 fewer than in prototype capsule discussed in the main body of the report 

 and thus acceptable. Capsules 2 and 3 bonded with SS-621 7 adhesive had 

 an order of magnitude fewer bubbles than capsule 1 bonded with PS-18; 

 capsule 1 in turn, had several orders of magnitude fewer bubbles than 

 capsule 0, which was also bonded with PS-18 adhesive. Although the multi- 

 tude of bubbles in capsule did not appear to cause any reduction in the 



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