Screw jack design: purpose of a separate load cup on the spindle head. Select the main functional reason for making the load cup a separate piece from the spindle head in a screw jack. Choose the correct option.

Concept
A separate load cup (often with a swiveling/ball seating) allows the load platform to remain stationary in rotation while the screw turns. This prevents rotation of the load, reduces scuffing, and accommodates slight misalignment.

Notes
Capacity and effort are more influenced by screw geometry and friction; the separate cup primarily addresses rotation and alignment.

Final Answer
Prevent rotation of the load being lifted