CNC vertical lathe special for disc gear turning refers to the use of CNC vertical lathes for CNC turning of disc gears. Here are the steps that might be involved in a typical situation:

1. CNC program writing: Write CNC programs, including geometric information of the workpiece, tool path, cutting speed, feed speed and other parameters. This is usually generated via CAM software.

2. Workpiece clamping: Clamp the disc (workpiece) firmly on the workbench of the CNC vertical lathe to ensure that the workpiece is clamped firmly and prevent movement or vibration during processing.

3. Tool selection: Select a tool suitable for gear turning. This may include gear milling cutters, turning tools, etc., depending on the shape and size of the gear.

4. Coordinate system setting: Set the coordinate system of the CNC system to ensure that the tool path in the program matches the position of the actual workpiece.

5. Process parameter setting: Set cutting speed, feed speed, cutting depth and other processing parameters. These parameters are based on disc material and gear requirements.

6. Automatic measurement and compensation: CNC systems usually have automatic measurement functions that can detect tool wear and compensate to maintain machining accuracy.

7. Processing operation: Start the CNC program to perform automated disc gear turning. This may include operations such as turning outside and inside diameters, grooving, cutting gear tooth profiles, etc.

8. Cooling and Lubrication: Use coolant to cool the tool and workpiece while providing lubrication to reduce friction.

9. Quality inspection: After completion of processing, quality inspection is performed to ensure that the gear meets the design requirements. It may be necessary to measure the size, tooth profile, surface roughness, etc. of the gear.

10. Cleaning and maintenance: Clean the processing area, regularly inspect and maintain various components of the CNC vertical lathe, and ensure the normal operation of the equipment.

These steps may vary based on specific gear design and requirements. Make sure to follow safe operating procedures during operation to prevent accidents.