Free feed axis calculator

Checks the ball screw for spindle speed, buckling, torque, and ideal travel time.

Spindle core diameter

Nominal diameter

Free spindle length

Bearing arrangement

Lead

Feed

Axial force

Efficiency

Travel distance

Acceleration

How to use the result

The calculation describes the specified model. Check the tool, workholding, and machine limits before use.

n = vf / pitchn_critical = λ · d_core · 10⁷ / L²M = F · pitch / (2000π · η)

Sources: https://www.thk.com/us/en/products/ball_screw/selection/0007/