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Long service life |
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At NEI steel balls are made
from High carbon chrome steel which has been vacuum
degassed to extremely low levels of residual oxygen. Steel
is very clean with few non metallic inclusions. |
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High Precision & Surface |
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At NEI steel balls are made on
latest production equipments such as National Headers of
Germany and Nishida & Chugai-Ro m/cs of Japan. Balls are
finished taking extreme care with regard to roundness,
roughness & scratches. |
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Consistent Quality |
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Accuracy of finished ball
conforms to ISO:3290-2001, IS:2898-1976 and JIS:B
1501-1988 |
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Ball Grade |
Ball dia variation
(maximum) |
Deviation from spherical
form (maximum) |
Surface Roughness
Ra (maximum) |
Lot diameter variation
(maximum) |
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G5 |
0.13 |
0.13 |
0.014 |
0.25 |
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G10 |
0.25 |
0.25 |
0.020 |
0.50 |
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Inspection Equipment |
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Dimensional
accuracy |
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Measured electronically by
millitron gauge with least count of 0.01 micron |
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Roundness |
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The degree of roundness is
measured with a Talyrond m/c from Taylor Hobson, England
having a maximum magnification of 2,00,000 times. |
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Surface
Roughness |
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The surface roughness is
measured on Talysurf m/c |
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Hardness
testing |
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The hardness is measured on
Rockwell hardness tester. |
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Vibration
testing |
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The vibration tester measures
the noise characteristics (dB) of steel ball. Results are
directly related to performance of Bearing. Ball noise is
checked on ball vibration meter from NTN, Japan. |
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Microscopic
Inspection |
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Steel balls are checked under
microscope for Surface uniformity & defects. |
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Capacity |
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Installed capacity |
56
T/month |
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Available capacity |
10
T/month |
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Size
Range |
Grade |
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7/32 "to 1/2" |
G5 |
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17/32 "to 3/4" |
G10 |
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