1. What is Ball Screw Drive Torque?

The ball screw drive torque is the rotational force required to move a load linearly using a ball screw mechanism. It accounts for both the force needed to overcome friction and the inertia of the system.

2. How Does the Calculator Work?

The calculator uses the ball screw drive torque equation:

Where:

• \( F \) — Axial force (N)
• \( L \) — Lead of the screw (m)
• \( \eta \) — Efficiency of the ball screw (0-1)
• Inertia Torque — Additional torque required to overcome system inertia (Nm)

Explanation: The equation calculates the torque needed to convert linear motion to rotational motion, considering the mechanical advantage and efficiency of the ball screw.

3. Importance of Drive Torque Calculation

Details: Accurate drive torque calculation is essential for selecting appropriate motors, ensuring system efficiency, and preventing mechanical failure due to insufficient torque.

4. Using the Calculator

Tips: Enter axial force in newtons, lead in meters, efficiency (typically 0.9 for ball screws), and any additional inertia torque. All values must be positive numbers.

5. Frequently Asked Questions (FAQ)

Q1: What is typical ball screw efficiency?
A: Ball screws typically have efficiencies between 0.85-0.95, with 0.9 being a common default value.

Q2: How do I determine inertia torque?
A: Inertia torque can be calculated from the moment of inertia and angular acceleration, or measured empirically.

Q3: What affects ball screw efficiency?
A: Efficiency depends on screw quality, lubrication, load, and operating conditions.

Q4: Should I include safety factors?
A: Yes, it's recommended to multiply the calculated torque by a safety factor (typically 1.5-2) for motor selection.

Q5: How does lead affect required torque?
A: Higher lead screws require more torque for the same force but allow faster linear motion for a given rotational speed.