Conditions of the Ball Screw
The following conditions are required when selecting a Ball Screw
Velocity Diagram| Transfer orientation | Horizontal, Vertical, etc. |
| Transferred mass | m (kg) |
| Table guide method | Sliding, Rolling |
| Frictional coefficient of the guide surface | µ (—) |
| Guide surface resistance | f (N) |
| External load in the axial direction | F (N) |
| Desired service life time | L h(Hour) |
| Stroke length | ℓs (mm) |
| Operating speed | Vmax (m/s) |
| Acceleration | t1 (s) |
| Even speed | t2 (s) |
| Deceleration | t3 (s) |
| Acceleration | α = Vmax / t1 (m/s)² |
| Acceleration distance | ℓ1 = Vmax × t1 × 1000 (mm) |
| Even speed distance | ℓ2 = Vmax × t2 × 1000 (mm) |
| Deceleration distance | ℓ3 = Vmax × t3 × 1000/2 (mm) |
| Number of reciprocations per minute | n (min-1) |
| Positioning accuracy | (mm) |
| Positioning accuracy repeatability | (mm) |
| Backlash | (mm) |
| Minimum feed amount | S (mm/pulse) |
| Driving motor | AC servomotor, stepping motor, etc. |
| The rated rotation speed of the motor | NMO (min-1) |
| Inertial moment of the motor | JM (kg · m²) |
| Motor resolution | pulse / rev. |
| Reduction ratio | A (—) |