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## What are the three types of screw jacks?
1. **Worm Gear Screw Jacks**: This type of screw jack uses a worm gear mechanism to convert rotary motion into linear motion. The worm gear is turned by a hand crank or an electric motor, causing the jack screw to move up or down. Worm gear screw jacks are commonly used for applications requiring heavy loads and precise positioning.
2. **Machine Screw Jacks**: Machine screw jacks utilize a machine screw instead of a worm gear to convert rotary motion into linear motion. This type of screw jack is often used in applications where high speeds and high duty cycles are required. Machine screw jacks are known for their efficiency and durability.
3. **Ball Screw Jacks**: Ball screw jacks incorporate a ball screw mechanism to convert rotary motion into linear motion with high efficiency. The ball screw allows for smoother and more precise movements compared to worm gear and machine screw jacks. Ball screw jacks are often used in applications where high speed and high precision are necessary.
Overall, the three types of screw jacks mentioned above all serve the purpose of converting rotational motion into linear motion, but each type has its own unique features and advantages depending on the specific requirements of the application.
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