Choosing the type of guide rail for a CNC vertical lathe usually depends on the specific machining needs, budget and requirements of the workpiece being processed. Hard rails and linear rails each have their own advantages, here are some of their characteristics:

1. Hard rail:

Strong rigidity: Hard rails usually have high rigidity, which can better resist vibration during the cutting process and improve the stability of processing.

Suitable for heavy loads: Due to the rigidity of the box rails, they are suitable for machining tasks that require heavy loads, such as machining of large components.

Long life: Hard rails generally have good wear resistance, have a long service life, and can maintain relatively stable accuracy.

2. Line rail:

High-speed machining: Linear rails generally have lower frictional resistance, making CNC vertical lathes more efficient during high-speed cutting.

Suitable for high-speed positioning: Linear rails perform better in high-speed positioning and are suitable for processing tasks that require frequent positioning and high-speed cutting.

Stable accuracy: Although the linear rail is less rigid than the hard rail, its design can provide relatively stable accuracy and is suitable for some precision machining.

When choosing, consider the following factors:

1. Workpiece requirements: If the workpiece being processed requires high precision and does not require frequent shape changes, hard rails may be a better choice. If high-speed cutting and frequent positioning are required, linear rails may be more suitable.

2. Budget: Generally speaking, hard rail is relatively more expensive. Line rails may be more economical in some situations.

3. Processing environment: Consider the requirements of the processing environment, such as whether it is easily affected by cutting fluid and whether it requires frequent cleaning.

4. Maintenance costs: Consider the maintenance costs of the equipment, including lubrication, replacement parts, etc.

Generally speaking, hard rails are suitable for scenes that require high rigidity and wear resistance, while linear rails are suitable for scenes that require high-speed cutting and frequent positioning. The processing needs and equipment characteristics need to be considered comprehensively when selecting.