CNC lathes have several parts that are critical to their operation. Here are a few examples of spare parts that may be needed for a CNC lathe:

1. Cutting tools: These are the tools that are used to remove material from the workpiece and are typically made from high-speed steel or carbide.
2. Tool holders: These are the devices that hold the cutting tools in place and allow them to be inserted into the spindle.
3. Bearings: These are used to support the rotating parts of the machine, such as the spindle and the tool post.
4. Belts and pulleys: These are used to transmit power from the motors to the various moving parts of the machine.
5. Linear guides and ways: These are used to guide the movement of the various axes of the machine and ensure precision.
6. Ballscrews: These are used to convert rotary motion into linear motion and are used to drive the movement of the machine’s axes.
7. Servo motors and drives: These are used to control the movement of the machine’s axes and are responsible for the machine’s precise positioning.
8. Control system: The control system is responsible for the machine’s operation, programming, and communication with the operator.

These are some examples, depending on the CNC Lathe model and brand, the spare parts may vary. It is important to have a good understanding of the CNC Lathe and its parts to ensure that the right spare parts are available when needed.