The idea of deep hole drilling emerged from its use for generating long and straight holes in the Guns and armaments industry. Defence industry is one of the major areas where deep hole drilling finds its application. The Barrel is the heart of the Gun and to obtain an accurate hole with the required surface finish is one of the precursors to a very accurate gunshot! Gun Barrel drilling is one of our specialties. Precihole has supplied numerous deep hole drilling solutions to most Ordnance factories in India for drilling and finishing various types of barrels like Piston barrel, Rifle Barrel, Shotgun Barrel etc. Precihole has developed specialty machines for operations like Rifling, Draw Boring, Pull Reaming, Honing and regularly services components like Torpedo tubes, actuator casing, breech block etc. for the defence industry.

Precihole GVN Series

Single Axis Gun Drilling

This series is our most popular series and has 100s of applications in dozens of industries. This series covers drilling range from Ø2mm to Ø40 mm and lengths of parts up to 1500 mm. Machines are designed for 3 shift production mode and provide all the features for excellent output parameters like straightness, bore tolerance and surface finish.

Precihole BVN Series

BTA Drilling

Precihole’s BVN series BTA deep hole drilling machines are well designed and robust to take heavy loads while drilling large holes. This series covers hole drilling from Ø20 mm to Ø250 mm solid and counter boring to Ø400 mm. Work piece lengths of 500mm to 10m can be accomodated on these machines. These machines are configurable with features depending on accuracy requirements and type of parts to be drilled.

Precihole PRVN Series

Pull Reaming

Precihole’s pull reaming machine series combines high speed sizing of holes. Surface finish as well as consistency of holes across the length of the part is vastly improved after pull reaming.Primary application of this series is in firearm manufacturing for all small caliber weapon systems.

Precihole HHM Series

Horizontal Honing

Precihole’s horizontal honing machine series is designed to provide all the features necessary to hone IDs in cylindrical shafts. Applications range from Oil & Gas industry, Energy and Military. These machines can be configured to hone parts from Ø30 mm to Ø400 mm up to 10m in length.

Precihole VHM Series

Vertical Honing

Precihole’s Vertical Honing Series is versatile and incorporates all the necessary features to produce excellent sizing and surface finish in a variety of parts in various industries. Precihole also provides all the fixturing and tooling needed for sizes ranging from Ø5 mm to Ø40 mm in this series.

Precihole BRVN Series

Button Rifling

Button Rifling Machines incorporates the latest features to form precision grooves in small caliber weapon systems. The rifling button is pulled and rotated precisely through the barrel. Precision in rifling is critical. The machine uses anti­ backlash helical guides and rotary encoder to interpolate linear and rotary motion. This produces rifling twists exactly as needed by the rifling tool. Machine features include load monitoring that graphs the rifling pull load on the HMI. Operator can monitor the rifling operation on screen, output to printer orflash disk if required.

Precihole BRM Series

Broach Rifling Machine

Broach rifling machine for large caliber weapon systems. Broach rifling creates spiral grooves in the barrel by removing steel using a hook cutter. The linear and rotary motion of the hook cutter are precision controlled for accuracy using a servo drive and ball screw or rack and pinion mechanism. The broach cutters are progressive in size and each cutter cuts a size slightly bigger than the previous one. The fine filtration system on the machine ensures that the system gets coolant at requires rates and the swarf is evacuated properly from the barrel.

Precihole CRVN Series

Cut Rifling

Cut rifling is a single point rifling system in which the cutter is pulled through the barrel and rotated at predetermined rates to give the necessary rifling twist. A passing cut is made down each groove sequentially and each cut removes only about 0.002 mm from the groove depth. This method does not induce any stress in the barrel. Hence the barrel does not need to be stress relieved before profiling and chambering. All high precision and sniper weapon systems use cut rifled barrels. They are considered more accurate and precise compared to other rifling methods.