Machine Design
The load cup of a screw jack is made separate from the head of the spindle to

Enhance the load carrying capacity of the jack
Reduce the value of frictional torque
Prevent the rotation of load being lifted
Reduce the effort needed for lifting the working load

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Machine Design
When the shaft rotates in anticlockwise direction at slow speed in a bearing, it will

Move towards right of the bearing making no metal to metal contact
Have contact at the bottom most of the bearing
Move towards right of the bearing making the metal to metal contact
Move towards left of the bearing making metal to metal contact

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