Precihole GVN-C Series – Single Axis Gun Drilling Machines with Counter Rotation

Precihole’s GVN-C Series Gun Drilling Machines with Counter Rotation offer superior hole concentricity as it relates to deep hole drilling for high precision gun barrels.  These machines incorporate the latest technology available and can be customized to suit volume requirements and provide excellent straightness, surface finish and bore tolerance. Length to diameter ratios of up to 125 are possible. The Precihole GVN-C series machines are complete solutions that include features needed for continuous and repeatable performance over many years.  The gun drilling operation is considered one of the most critical operations in the barrel making process.  This process really decides the quality of the finished barrel.  Precihole’s GVN-C series barrel machines offer the best combination of output parameters like hole straightness, surface finish and bore tolerance.  Having counter rotation in the Precihole GVN-C series is effective for drilling holes of 40:1 depth to diameter ratios or more.

  • Award winning design – continuously improved and proven over the past 3 decades
  • Best value and return on investment in the industry
  • Modular construction that allows high level of flexibility for standard components
  • Option for 2 or 4 spindle configurations to accommodate high productivity environments
  • Touch screen and programmable logic controls
  • Quick and operator-friendly setup and changeovers
  • Multiple types of automation can be incorporated

Machine features:

  • Component counter rotation to ensure excellent straightness
  • Robot readiness for easy integration in an automated cell
  • Use of ball screw and servo drives for smooth linear motion
  • Multiple tool steadies to provide tube support
  • Rotating cone or self-centering chuck arrangement for part clamping
  • Fast clamping arrangement for ease of loading and unloading parts
  • High pressure coolant and fine filtration system
  • Oil chiller and automatic lubrication
  • Mitsubishi / Siemens PLC controls with touch screen HMI
  • Integrated unibody design to reduce overall machine footprint

Specifications

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Item / Model
GVN08C Request a Quote
GVN12C Request a Quote
GVN20C Request a Quote
GVN25C Request a Quote
GVN40C Request a Quote

Drilling Diameter Range

0.08″ – 0.3″

0.12″ – 0.47″

0.197″-0.1″

0.315″ – 1″

0.31″ – 1.57″

Number of Spindles

1 / 2 /4

1 / 2 /4

1 / 2 /4

1 / 2

1 / 2 /4

Max. Drilling Depth

16″/24″/40″

16″/24″/40″

16″/24″/40″

16″/24″/40″

16″/24″/40″

Part OD Range

0.4″ – 2″

0.4″ – 2″

.47″ – 3″

.47″ – 3″

.6″ – 4″

Part Clamping System

Hydraulic Cone Clamping / Chuck Clamping

Hydraulic Cone Clamping / Chuck Clamping

Hydraulic Cone Clamping / Chuck Clamping

Hydraulic Cone Clamping / Chuck Clamping

Hydraulic Cone Clamping / Chuck Clamping

Max. Component Weight

67 lbs.

67 lbs.

111 lbs.

111 lbs.

155 lbs.

Counter Rotation Speed (RPM)

300 RPM

300 RPM

300 RPM

140 RPM

300 RPM

Drill Feed Range

0-40 IPM

0-40 IPM

0-40 IPM

0-40 IPM

0-40 IPM

Rapid Traverse

393 IPM

393 IPM

315 IPM

315 IPM

157 IPM

Power per Spindle

2 HP

3 HP

7.5 HP

10 HP

20 HP

Spindle Speed

2000-12000 RPM

1200-10000 RPM

600-6400 RPM

600-3300 RPM

350-3300 RPM

Coolant Tank Capacity (Gallons)

225/238/290

225/238/290

277/290/330

277/290/330

530

Max. Coolant Pressure (PSI)

1740

1450

1160

870

870

The GVN12C/4-800 is capable of handling gun drilling of gun barrels for all small arms weapon calibers up to 32’’ in length. Here are some of its improved features and their benefits:

  • Variable counter rotation speed (250-700 RPM) to improve output parameters: The ability to change counter rotation speeds helps to keep the drill in the center thereby improving TIR achieved during gun drilling.
  • Automatic part length adjustment setting from HMI: This improves setup change times by allowing the operator to set part length automatically on the screen, rather than having to turn the lead screw manually.
  • Enhanced tool breakage monitoring system: Incorporating a current based sensing technology helps prevent gun drill breakage when the current exceeds a threshold.
  • Four tool supports (previous version had three): This improves output results for better straightness when gun drilling small calibers like 223 and 5.56.
  • Improvements in guarding for sliding doors: The use of LM guides makes the doors function smoothly. This is important when working with robots especially.
  • Better heat ventilation in electrical panel: Reduces heat generation in the electrical panel to help improve life of sensitive electronics.
  • Improved user interface: Offers simpler and much better designed custom screens showing critical data to operators.
  • Mobile Screen features: This gives operators the ability to monitor HMI screens remotely on a computer or mobile device in the same Wifi network, so you don’t need to be on the machine to see whats going on. This comes in very handy when machine is being operated in auto mode by a robot.
  • Alarm troubleshooting guide through HMI: This guide gives suggestions when the machines encounters alarms and suggests further course of action, which improves uptime of the machine and reduces need for a service engineer to visit