What is the hole of the deep hole drill?

What you should ask is: How deep is the hole drilled by the deep-hole drill? Usually 4 to 6 mm.

Supplementary knowledge:

Generally, a hole with a depth of more than 5 times the aperture is called a deep hole, and its difficulty lies in chip removal and cooling. For holes with relatively small drilling depth, twist drills can be used. In order to remove the chips smoothly, the iron chips should run straight out in the form of thin strips, bringing out smaller chips, and the coolant is easy to enter.

Deep hole drilling (gun drilling) is a deep hole processing technology developed in recent years. Traditional deep hole machining (the ratio of cutting depth to hole diameter is greater than 5) needs to go through many processes such as drilling, boring, rough reaming, grinding, etc., in order to machine holes with high precision and low surface roughness. The new technology adopts special tools and high-pressure cooling and lubrication system, which can simplify the above-mentioned multiple processes into one continuous feed and complete the hole processing with high precision and low surface roughness at a considerable depth. The process has high efficiency and remarkable economic benefits.