Dual-Spindle Gun Drill Cuts Deep-Hole Cycle Times in Half
Kent USA's recently introduced KGD-32 dual-spindle gun drilling machine doubles throughput on coaxial deep-hole work without demanding a larger factory floor footprint.
Instead of handling one part at a time, the machine utilizes two servo-driven spindles spaced 140 mm apart to run simultaneous operations. What sets this machine apart for manufacturers is its counter-rotating design. While each drill box spindle spins up to 6,000 RPM, the headstock turns the workpiece in the opposite direction at speeds up to 117 RPM. This opposing mechanical action creates a self-centering effect that keeps the drill precisely on center.
As a result, the system maintains a bore concentricity of 0.01 mm Total Indicator Reading or better, and delivers a smooth surface finish down to Ra 0.2 µm when counter-rotation is engaged.
The machine handles a drilling diameter range from 4 mm to 30 mm and can reach a maximum hole depth of 1,000 mm, supporting an impressive 100:1 length-to-diameter ratio. This range makes it well-suited for processing crankshaft oil passages, complex hydraulic blocks, and internal cooling channels for heavy-duty mold and die tooling.
To support non-stop industrial cycles, the system incorporates a dedicated high-pressure coolant unit that pumps up to 1450 psi through a 20-micron paper-tape filtration system, backed by a massive 1,000-liter oil tank.
Driven by a FANUC 0i-TF Plus control system, the machine relies on an ultra-rigid HT300 cast-iron bed, HIWIN linear guide rails, and NSK spindle bearings to ensure long-term thermal stability and repeatable accuracy across multi-shift factory operations.
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