Threaded shaft controlling Z-axis movement.

Positioning error caused by mechanical clearance.

Ability to return repeatedly to the same Z position.

Degree of correctness in Z-axis positioning.

Smallest measurable or controllable Z-axis movement.

Total distance available along the Z-axis.

Difference between reference and actual Z-axis positions.

Sensor measuring or detecting Z-axis position.

Process of accurately setting Z-axis position.

Platform moved vertically or along the Z-axis.