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Even the crummiest level (grade 1000) listed in this chart is spherical to 1 mil. For a 3/8" diameter ball, that's better than the roughly one-part-in-300 variation in the earth's diameter.Grade 25 (.025 mil sphericity) bearings are sold in bicycle stores.
Even the crummiest level (grade 1000) listed in this chart is spherical to 1 mil. For a 3/8" diameter ball, that's better than the roughly one-part-in-300 variation in the earth's diameter.
Grade 25 (.025 mil sphericity) bearings are sold in bicycle stores.
