Pneumatic drills are generally not suitable for core drilling. Coring drilling requires the drill to be able to cut and extract core samples stably and accurately, and pneumatic drills have limitations

 in the following aspects:

1. Working principle

Pneumatic drills use high-pressure air to drive the drill bit for high-speed impact drilling. They are designed to quickly break the formation and are suitable for hard rock and shallow drilling, not

 fine core extraction.

2. Drilling force and precision

Coring requires continuous and stable force to ensure the integrity of the core. The impact drilling method of pneumatic drills produces irregular impact forces, causing the rock to be broken into 

small pieces instead of a complete core.

3. Drill bit design

Coring drill bits are usually annular in design to surround and extract the core, while the drill bits of pneumatic drills are designed to quickly break the formation and cannot achieve fine core cutting

 and extraction.

4. Chip removal and cooling

Pneumatic drills use compressed air to discharge drill cuttings, which can easily damage the core. Coring drilling requires cooling and lubrication systems to protect the integrity of the drill bit and

 core. Pneumatic drills generally lack complex cooling and lubrication systems.

5. Application scenarios

Pneumatic drills are often used in shallow geological exploration and mine ventilation where rapid drilling is required, while coring drilling is used in deep geological exploration and mineral surveys

 where complete rock samples need to be obtained.

In summary, pneumatic drills are difficult to achieve high-quality core extraction due to their impact drilling principle, lack of stable continuous force, drill bit design, and chip removal methods. 

Coring drilling is more suitable for hydraulic or electric coring drills, which provide more stable power and high-precision operation, and are suitable for complex geological conditions and 

high-demand coring tasks.