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Servo electric screwdrivers and pneumatic electric screwdrivers are both mature solutions that provide the power for driving screws, reduce operator fatigue, and offer basic torque adjustment. Because they are inexpensive, reliable, and easy to use, they are widely deployed in manual or fully automated stations.

Below is a side-by-side comparison to help you choose the right tool for your application.

1. Power Source
   ? Servo: electric servo motor (AC/DC)
   ? Pneumatic: compressed air

2. Torque Control & Traceability
   ? Servo: closed-loop feedback gives ±3 % repeatability; every torque and angle value is logged and exportable.
   ? Pneumatic: open-loop air motor + mechanical clutch; torque varies with line pressure and joint stiffness; no electronic data.

3. Typical Torque Range
   ? Servo: 0.02–50 N·m (precision models)
   ? Pneumatic: 0.5–120 N·m (industrial models)

4. Speed & Cycle Time
   ? Servo: electronically variable (e.g., 10–2 000 rpm); final low-speed ramp prevents overshoot.
   ? Pneumatic: very high free speed for rapid rundown, but less control during final tightening.

5. Accuracy & Quality Defects
   ? Servo: virtually eliminates floating screws, stripped threads, or missed screws.
   ? Pneumatic: operator must judge shut-off point; higher risk of under- or over-torque.

6. Noise & Ergonomics
   ? Servo: quiet (< 60 dB), low vibration, minimal reaction torque.
   ? Pneumatic: loud (80–90 dB), noticeable vibration, but no electric reaction torque.

7. Cost
   ? Servo: higher initial cost, but lower total cost of ownership thanks to fewer rejects and full traceability.
   ? Pneumatic: ~25 % cheaper upfront; consumable costs (air, clutch parts) add up over time.

8. Typical Applications
   ? Servo: electronics, medical devices, compressors, high-pressure piping—any process requiring precise, traceable preload.
   ? Pneumatic: large assemblies with small screws where speed is critical and torque accuracy requirements are moderate.

9. Maintenance
   ? Servo: mainly software calibration; mechanical wear is low.
   ? Pneumatic: periodic clutch replacement and airline filtration.

Conclusion
If your process demands repeatable torque, full traceability, and zero defects, a servo electric screwdriver is the clear choice. If you prioritize the lowest initial cost and highest free speed for less-critical joints, a pneumatic screwdriver remains economical. Select the tool that best matches your quality, throughput, and budget requirements.