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For structure characteristics, gun drill is different from twist drill in use, for which some important precautions are provided as follows:
Equipment for using gun drill is normally special-purpose machine tool, or you can select QYZ deep-hole drilling system suitable for such general machine tools as turning mill and boring mill modification. No matter what type of gun drill equipment is selected, it is recommended to use manufacturer-advised cutting parameter.
When using gun drill, especially simple QYZ deep-hole machining equipment, please take proper measures to protect the machine tool to prevent personal injury resulted from cutting chips and coolant spilling.
An as-required high-pressure cooling system is essential to deep-hole drilling. The system’s pressure and flow shall refer to manufacturer’s advised data. The cutting fluid shall be special-purpose deep-hole cutting oil(fluid) containing extreme-pressure additive.
Gun drill bit is off center, therefore, it can’t function for self-centering, for which a drill bush or a lead hole shall be used during drilling for guiding purpose. Drill bush shall be replaced in case its inner hole size is 0.02mm bigger than the gun drill’s nominal size.
It is forbidden to start drill stem main shaft before the drill bit enters drill bush (lead hole), coolant is opened, and effective support is acquired. When retracting, the main shaft shall stop rotating or rotate at an extremely low speed of 50rpm.
In machining work, the non-supported length of the gun drill shall be no more than 40 times of cutter diameter, otherwise, the cutter is likely to be damaged.
http://www.gsmdrilling.com/gun-drill-shank
It’s compulsory to implement regrinding management to gun drill. Regrinding shall take GSM’s RMQ-A grinding fixture and special-purpose diamond grinding wheel, which is feature with good regrinding precision, easy and fast operation.
