CNC (Computer Numerical Control) machining is a precision manufacturing technology controlled by computers, widely used in the manufacturing industry. CNC tools are the core components of CNC machining, and different tools can perform various machining tasks. Below are some commonly used CNC tools and their applications:

1. End Mill
   The end mill is one of the most commonly used tools in CNC machining, primarily used for milling planes, slots, contours, and complex shapes. Depending on their shape and purpose, end mills can be categorized into flat-end mills, ball-end mills, and corner-radius end mills.

2. Drill Bit
   Drill bits are used to create holes in materials. CNC machines can precisely control the feed rate and rotational speed of the drill bit, ensuring the accuracy of hole dimensions and positions.

3. Turning Tool
   Turning tools are mainly used in CNC lathes for turning external cylinders, internal holes, and end faces. Types of turning tools include external turning tools, internal turning tools, and cutoff tools.

4. Tap
   Taps are used to create internal threads in holes. CNC machines can control the rotation and feed of the tap through programming, ensuring thread accuracy and quality.

5. Boring Tool
   Boring tools are used to machine large-diameter precision holes. With CNC control, boring tools can achieve high-precision hole diameters and surface finishes.

6. Saw Blade
   Saw blades are used for cutting materials. CNC sawing machines can precisely control the cutting speed and feed rate of the saw blade, ensuring flat and accurate cutting surfaces.

7. Grinding Wheel
   Grinding wheels are used for grinding operations, improving the surface finish and dimensional accuracy of workpieces. CNC grinding machines can achieve high-precision grinding.

The selection and use of CNC tools significantly impact machining quality and efficiency. Properly choosing tool materials and geometric parameters can greatly enhance machining efficiency and workpiece quality.