Here are some key points about straight bevel gears and their use in electrical tools:

1. Design: The teeth on straight bevel gears are straight and cut at an angle to the face of the gear. This allows them to mesh with another bevel gear at a 90-degree angle.
2. Function: They are used to change the direction of power transmission while maintaining the torque and speed of the input shaft. This is particularly useful in electrical tools where space is limited and a compact solution is needed.
3. Material: Straight bevel gears can be made from a variety of materials, including steel, aluminum, and plastic, depending on the application and the loads they need to handle.
4. Manufacturing: They are typically manufactured using processes such as casting, forging, or machining. The teeth are then cut using a gear cutting machine.
5. Maintenance: Proper lubrication is crucial for the longevity of bevel gears. They should be checked regularly for wear and damage.
6. Applications: Straight bevel gears are used in a wide range of electrical tools and machinery, including power tools, hand tools, and various types of industrial equipment where a right-angle drive is required.
7. Advantages: They offer a compact solution for right-angle power transmission, are relatively easy to manufacture, and can be designed to handle a range of torque loads.
8. Disadvantages: Compared to other types of gears, straight bevel gears may have higher noise levels and are more prone to wear if not properly lubricated and maintained.