Gun drilling takes internal coolant and external chip removing. Gun drilling machine is mainly in deep hole drilling deep hole or precise shallow hole of small diameter. The drilling tool can be convenient re-sharpened through special tooling which realizes long service life and cost-effective. Through gun drilling, excellent straightness and surface quality can be achieved as well as small tolerance scope. In consequence, gun drilling is the most common deep hole drilling method, especially in drilling hard material and material of extreme hardness.
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