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Oversized ball preload |
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Integral preload |
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| This method employs one ball nut, with steel balls slightly larger than the ball-groove-space inserted to form a 4-point contact preload. This is suitable for light to normal preload. |
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This method employs a single nut with an integral pitch-shift (a+a shown
above) of the recirculating circuit at the center of a ball nut. The amount of
this shift represents the amount of preload. This method is suitable for normal
preload.
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Double nut preload (Pin method) |
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Double nut preload (spacer method) |
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Two ball nuts are used in this method. Preloading is created by both nuts
being tighten from each other about the screw shaft. To prevent the ball nuts
from rotating against each other, a Fixed-pin is inserted between the two. This
method is suitable for medium to heavy preload.
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Two ball nuts are used. A spacer is inserted between the nuts to create a
preload. This is suitable for medium to heavy preload.
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Double nut preload (Spring method) |
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Two nuts are used. A spring is inserted between the nuts to create a
preload. This method is suitable when minimum rotational torque variation is
desired.
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