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The processing condition of the gun drilling tools is half closed, and you can’t see the cutting condition by eyes. And all that you can is through the sound, cutting parameter, machine bearing, pressure gauge and shaking of machine , and to check the working condition of machine.
Cutting heat is not always not so easy to spread. Under the normal condition, 80% heat is taken by the chip , but for the deep hole drilling, this is only 40%, which is taken by chip, it;s difficult to losing heat and easy to overheat, the temperature is 600 °, in this way, the gun drilling tools must force to coolant. 
The iron chips are difficult to remove. Because of the drilling depth and deep hole processing procedure is long, it’s easy to block inside the gun drill and cause the drill bit broken. Thus, the length of the chips should under control and also force to chip removing.
The rigidity of deep hole drilling is not so good. Because of the limit of drilling hole diameter and drilling depth, the drill shank is long and slim, the rigidity is poor, which is easy to skewness, as a consequence, the drill stem support frame is very important. Hence, the for gun drilling machine, rigidity is an very important factor in deep hole drilling.
If any more question, please feel free to contact us.
Email:gsmsxoffice@gmail.com
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