About Gun Drilling
Gun drilling is one common method of deep hole drilling, generally used for smaller diameter holes. This method is ideal for achieving extreme depth-to-diameter drilling ratios at these small diameters, due to a refined process of cutting, exhausting chips, and maintaining straightness and roundness tolerances.
A gun drill tool differs from conventional twist drills due to its unique head geometry; a gun drill has a single effective cutting edge. Straightness is maintained by guide pads that burnish the hole during the drilling process. The resulting hole is extremely round with a precision diameter and relatively smooth surface finish.
Gundrilling differs from the BTA process by its method of coolant entry and chip exhaust. Gundrill coolant is introduced through a small hole within the tool, which connects at the spindle to coolant lines. Chips and coolant run along a v-shaped groove along the exterior of the tool. BTA drilling introduces coolant through a mechanism around the tool head and drill tube, and is contained in the pressure head, or boza. BTA tools have a large hole in the tool head that allows chips and coolant to easily exit, without clogging or scratching. BTA drilling becomes more effective than gundrilling around a hole diameter of 50mm.
Klick here for more details and information about the gundrilling solutions from UNISIG!
