Choosing the cutting amount of a CNC lathe involves many factors, including processing materials, tool types, workpiece requirements, machine tool performance, etc. Here are some suggestions for choosing cutting quantities in general:

1. Processing materials: Different materials on CNC lathes have different hardness, toughness and cutting properties, so it is necessary to select the appropriate cutting amount according to the specific material. Generally speaking, for CNC lathes, the cutting amount can be appropriately increased for materials with higher hardness, while for materials with better toughness, the cutting amount can be appropriately reduced.

2. Tool types: Different types of tools on CNC lathes are suitable for different processing tasks, such as end mills, drills, turning tools, etc. CNC lathes select the appropriate cutting amount based on the characteristics of the tool and the recommended cutting amount range.

3. Workpiece requirements: The CNC lathe selects the appropriate cutting amount based on the processing requirements and surface roughness requirements of the workpiece. Normally, if a CNC lathe requires higher surface quality, the cutting amount can be appropriately reduced to improve surface accuracy and smoothness.

4. Machine tool performance: The performance of CNC lathe includes spindle power, cutting speed range, feed speed range, etc. Select the appropriate cutting amount based on the performance parameters of the CNC lathe and the cutting amount range recommended by the manufacturer.

5. Cutting stability: The selection of cutting amount of CNC lathe should consider cutting stability. CNC lathe should avoid problems such as tool vibration and poor surface quality of workpiece caused by too large or too small cutting amount.

6. Trial cutting experiment: Before determining the cutting amount, a CNC lathe can conduct a trial cutting experiment to determine the best cutting parameters. CNC lathes can evaluate processing efficiency, surface quality and tool life through trial cutting experiments to determine the optimal cutting amount.

In general, choosing the cutting amount of a CNC lathe requires comprehensive consideration of materials, tools, workpiece requirements, machine tool performance and other factors, and the best cutting parameters are determined through trial cutting experiments. In actual processing, the cutting amount also needs to be adjusted at any time according to specific conditions to achieve the best processing effect.