1. The cutter bar of deep hole drilling machine is limited by the hole diameter, with small diameter and large length, resulting in poor rigidity and low strength. It is easy to generate vibration, ripple and taper during cutting, which will affect the straightness and surface roughness of deep holes.

2. When the Universal CNC deep hole drilling machine is used for drilling and reaming, it is difficult to input the cooling lubricant into the cutting area without using a special device, which reduces the tool durability and makes chip removal difficult.

3. In the process of deep hole machining, it is generally impossible to directly observe the cutting condition of the tool. Our staff can only judge whether the cutting process is normal by listening to the cutting sound, watching the chips, touching the vibration and workpiece temperature, and watching the instrument (oil pressure gauge and electric meter) based on their work experience.

4. It is difficult to remove chips from deep hole drilling. Reliable means must be used to break chips and control the length and shape of chips to facilitate smooth removal and prevent chip blockage.

5. In order to ensure the smooth processing of deep holes and meet the required processing quality, the internal (or external) chip removal device of the tool, the tool guide and support device and the high-pressure cooling lubrication device should be added.