Fireball Sphere Grinder Manual - Barranca Diamond3) Never attempt to touch or grab sphere material or grinding/polishing cups ... The center (white) base mount bearing has waterproof seals to cope with the.sphere grinding centers,SPHEREThe identification of static bad (dead or hot) pixels in the data reduction . For all SPHERE instruments accurate determination of the field center is important.Covering a Sphere with Retroreflectors - JPL Robotics - NASAlocations of the retroreflectors are limited to areas not occupied by solar cells, .. To avoid grinding funnel-shaped holes, the sphere was given a radius of 7 cm.
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