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Dimensional check Dimensional checks are • Basic diameter • Ball diameter variation • Lot diameter variation Precision of the equipment : ± 1/100 µm. |
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Surface Roughness Surface roughness consists of measuring all those irregularities which form surface relief and which are conventionally defined within the area where deviations of form and waviness are eliminated Precision of the equipment: 2 nm. |
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Deviation from spherical form The greatest radial distance in any radial plane between a sphere circumscribed around the ball surface and any point on the ball surface Precision of the equipment: 5 nm. |
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Eddy Current Tester A machine to safeguard the quality in final inspection and to check for surface cracks. Technician certified Cofrend Cosac. |
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Visual inspection Observation of the ball surface by the naked eye. It is also called macroscopic inspection . |
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Metallurgic analysis Hardness, Inclusion, decarburization, grain size, carbide distribution. |
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