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1. The clamping of workpiece must be safe and reliable,and in the same axis with the machine spindle. Process a positioning hole or center hole to position the workpiece.
2. When process the long workpiece, there should be a fixed center frame to fix the workpiece and gun drill, and besides there should also has 1 to 3 movable supporters.
3.The center hole diameter of the workpiece should be smaller than diameter of the gun drill. If the hole diameter of the center hole can’t be small, we should use the special guide sleeve.
4.When starting deep hole drilling, there should be a guide sleeve, the inside hole diameter of the guide bush should match with the hole diameter of the gun drill. The tolerance of the inside hole diameter of guide sleeve should achieve IT6. When the workpiece is short or the requirement towards the linearity is not so high, we can also drill a guide hole on the workpiece in advance.
5.Guide bush is wearing parts. When the wearing capacity of guide bush’s inside hole diameter is bigger than 0.02mm, replace the guide bush,and the most good material is carbide. For GSM, the material of guide bush is mostly carbide.
6.Problems and reasons when gun drill processing 
If any more question, please feel free to contact us.
