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

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

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Machine Design
The plasticity is the property of a material which enables it to

Draw into wires by the application of a tensile force
Resist fracture due to high impact loads
Regain its original shape after deformation when the external forces are removed
Retain deformation produced under load permanently

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