Gun Drilling Machines

Gun drilling machines for automotive rods and shafts, injection molds, and medical components manufacturing.

LPR’s Gun Drilling Machines create straight, precise holes with 3-32 mm hole diameter and up to 1500 mm drilling depth, resulting in high depth-to-diameter ratios of 1:100 and 1:200. Our machines are widely used for parts manufacturing in the mold & die, automotive, medical, and metalworking industries. Gun drilling can be used with a variety of materials including alloy steel, stainless steel, aluminium, cast iron, copper alloys, and more.

 

Our CE, ISO 9001 and ISO 4001-certified manufacturing site in South Korea has over 30 years of experience providing gun drilling solutions and has served more than 300 customers. Local machine installation and aftersales support are provided across North America. Contact us to discover how our gun drilling machines can improve your hole tolerance and surface finish.

Precision CNC Gun Drilling Machines | Deep Hole Drilling Solutions

 

Gun Drilling Machines perform deep hole drilling using a long, thin cutting tool to remove chips from a workpiece. Coolant is supplied through a small hole within the tool and chip removal occurs through a groove on the outside of the tool. LPR Global provides complete solutions for gun drilling including high precision solid carbide tooling made in-house. We have supplied machines to parts manufacturers and job shops around the world in USA, Australia, Czech Republic, Romania, Vietnam, Indonesia, China, India, Taiwan and Japan.

 

Our gun drilling technology offers several advantages over competing drilling and hole-making methods. Various complex hole types are possible, such as overlapping holes, cross holes, tilted holes, multiple diameter holes, and holes on angular, round or curved surfaces. Manufacturers can achieve precise tolerances for hole diameter, roundness and cylindricity, while reducing the costs of secondary operations. The precise drill guide bushing and self-piloting drill minimize drift and maintain hole straightness of 1 mm per depth of 1000 mm. Using solid carbide-tipped gun drills to improve drilling speed, our machines can produce a high quality surface finish (Rmax 8-25S for S45C steel). This eliminates the need for secondary machining operations and creates a finished hole in just one pass.

 

Gun Drilling Speeds and Feeds PDF Icon

Gun Drilling Applications | Rods, shafts, injection molds, tube sheets

  • Automotive parts: input shafts, output shafts, pinion gears, steering shafts, gear shafts, rack bars, balancing shafts, fuel injection nozzles
  • Injection molds: ejector pin holes, coolant holes, hot runner manifolds, plastic molds, metal molds, carbon molds
  • Other parts: orthopedic devices, heat exchanger tube sheets, heat exchanger baffles, sleeve pins, hydraulic manifolds

Gun Drilling & BTA Drilling Machines | Specifications PDF Icon

 

Our range of products consists of column-type and knee-type gun drilling machines and combined BTA drilling and gun drilling machines, which are ideal for large or heavy workpieces. The BTA drilling process covers a diameter range of 16-65 mm with a maximum drilling depth of 1,800 mm. We have sold over 600 machines since our inception, including 30+ standard models for general industrial applications, specialized models for automotive, mold, and heat exchanger applications, and a variety of customized designs based on the customer’s workpiece, cycle time and preferred transfer systems. View our Product Line section for descriptions of each model.

 

Our machines are built with high grade, high rigidity cast iron, making them extremely durable over an average service life of 20-30 years. Using FANUC 3-axis CNC systems, the user has greater control over location positioning, machining depth and machining speed. Various machine configurations and options are available including workpiece rotation units, moving tables, angle plates, high precision rotary tables, one-touch hydraulic tool holders, and automated loading, parts handling and transfer systems. Additional spindles and tools can be installed for further machining processes such as surface milling, tapping and chamfering.

Compact, Knee Type Gun Drilling Machine
Column-Type BTA Drilling + Gun Drilling Machine
 
KHG
KEG
KEXG
KHBG
KHBG-W
KHRG
KDG/KIG
KTBG
Application
Large workpieces, injection moldsWater, heat and ejector pin holes in plastic molds, hydraulic manifolds,heat exchangersSmall to medium-sized parts, small diameter holesSmall to large industrial, hydraulic and heat exchanger partsLarge or heavy industrial, hydraulic, and heat exchanger partsPrecision parts, moldsCompact machine for mass production of partsHeat exchanger tube sheets
Drilling Spindles
1
1-2
1-2
1
1
1
1-4
1
Drilling Diameter (mm)
3-32
3-32
2-12
GD 7-20, BTA 16-65
GD 7-20, BTA 16-65
3-32
3-32
7-32, 16-65
Drilling Depth (mm)
1,500
600
800
1,000
400
600
800
GD 1,500
BTA 2,100
GD 1,500
BTA 2,100
1,500
1,800
400
600
800
2,150
Spindle Motor Power (kW)
5.5,
7.5
5.5,
7.5
1.5,
7.5
22,
26
22,
26
15,
18
1.5,
5.5
22,
26
Z Axis Motor Power (kW)
1.6
1.6
1.6
7.0
9.0
1.6
1.0-2.1
9.0
Table Max. Load Capacity (kg)
6,000
10,000
1,000
2,000
1,000
6,000
10,000
25,000
6,000
15,000
22,000
25,000
1,000
2,500
35,000
40,000
45,000
50,000

Gun Drill Tools and Accessories | Specifications PDF Icon

 

Precise, rigid gun drill tools are essential for providing high feed rates and high cutting accuracy. We make gun drill tooling in-house for use in our deep hole drilling systems. Single flute, carbide-tipped gun drills are available from 3 mm to 30 mm with a sharp cutting edge and a wide flute for excellent chip evacuation. Fast cutting speeds and long tool life are achieved using low vibration at the tool head and reinforced drill tubes that reduce eccentricity. Tools can be easily reground using a universal tool grinder.

 

All our machines come with additional accessories and optional features to enhance gun drilling performance. Machine components include drill guide bushings, whip guides, oil seal rubber gaskets and bearings that prevent gun drill vibration and whipping. Other accessories include a filter bypass, oil cooler, automatic coolant retrieval system, high pressure pumps, clamping jigs, rotational jigs, centrifugal separators, and various types of chip conveyors. We also provide easy-to-use universal tool regrinders with a diameter range of 3-44 mm.

Gun Drilling Machine Accessories
Gun Drilling Finish Examples

Gun Drilling Process | Machine Operation Video

Column-Type & Knee-Type Compact Gun Drilling Machines

Column-type gun drilling machine for large, heavy workpieces
Knee-type gun drilling machine
Compact, high precision gun drilling machine

KHG Series

Column-type gun drilling machine for large, heavy workpieces, injection mold water lines, and ejector pin holes. Ideal for processing heat-treated steel. Optional spindle for tapping and chamfering.

KEG Series

Knee-type gun drilling machine with dual manual and automatic modes for multi-hole drilling in plastic molds, metal molds, hydraulic manifolds and heat exchangers.

KEXG Series

Compact, high precision machine for mass production of small & medium-sized parts, small diameter holes, and mold sleeve pin holes.

BTA Drilling + Gun Drilling machine for precision machining
BTA Drilling + Gun Drilling machine for large workpieces
4-Axis CNC gun drilling machine

KHBG Series

Combined BTA Drilling + Gun Drilling machine for fast, high precision processing of workpieces in various sizes and materials. Optional angle plate available for petrochemical applications.

KHBW Series

Combined BTA Drilling + Gun Drilling machine with large work table for heavy workpieces up to 25 tons. Optional angle plate available for petrochemical applications.

KHRG Series

4-Axis gun drilling machine with moving column, horizontal rotary table and hydraulic tool holder. Different tools can be attached for tapping, surface milling and other machining processes.

Compact gun drilling machine for mass production of parts
BTA Drilling + Gun Drilling machine for heat exchangers
Gun Drilling Machine for Automotive Parts

KDG/KIG Series

Compact gun drilling machine with self-contained structure for minimal floor space consumption. Designed for mass production of parts by using up to 4 spindles and integrating automatic clamping, loading and parts handling systems.

KTBG Series

Combined BTA Drilling + Gun Drilling machine for production of cooling channels in heat exchanger tube sheets. Optional angle plate and V-block available.

KWG Series

Specialized gun drilling machine for mass production of automotive cam shafts and input shafts, allowing drilling from either side.

Gun Drilling Technology and Quality Assurance

Our manufacturing facility in South Korea is certified to CE, ISO 9001 and ISO 14001 standards. It was established in 1986 as a joint venture with Miroku Japan, a leading firearms manufacturer. Building off their advanced technology, we continue to invest heavily in research and development for the consistent improvement of cutting quality, tool life and machine accessories. We use high quality components from Europe including cast iron, drilling spindles and carbide shanks.

 

Our semi-automatic tool production line consists of NC machines and manual checks to minimize defects. Tool straightness is checked 5-6 times in a cycle to ensure high accuracy. We also perform close inspection of oil flow to achieve 100% reliability, and use isothermal and isohumidity chambers to reduce errors.

Patents | Gun Drilling Machine Components

  • Clamping mechanism for an inclined machine bed
  • Chucking device for tool holder
  • Spindle for a multi-purpose gun drilling machine for additional machining operations including drilling, tapping, milling, boring and facing.
  • Spindle for a multi-purpose deep hole drilling machine, peforming both gun drilling and BTA drilling processes
  • Rotary table with backlash control for a gun drilling machine
  • Counter-rotating workpiece mechanism to improve hole straightness
  • Work table tilting mechanism to improve punching process

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