Firearms Industry
The idea of deep hole drilling emerged from its use for generating long and straight holes in the Guns and armaments industry. Firearms 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 firearms industry.
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.
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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.
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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.
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HHM Series
Horizontal Honing
Precihole Horizontal Honing Machines cover the requirements of honing the complete range of medium and large caliber artillery barrels from Ø20 mm to Ø160 mm. The maximum length of the barrel can be up to 10000 mm. The honing solution includes the machine as well as all the tooling and tooling accessories needed. The design of the machine is optimized to allow quick loading and unloading of barrel. Precision control of depth and diameter of the barrel are ensured by using PLC controls and servo drives.
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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.
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BRVN Series
Button Rifling
Precihole Button Rifling Machines incorporate state of the art features to form precision grooves in small caliber gun barrels. The rifling button is pulled and rotated precisely through the barrel. The machine uses anti-backlash helical guides and rotary encoder to interpolate linear and rotary motions. This combination produces highly precise twists in the barrel. Rifling operation is extremely fast at 40-50 IPM pull feeds.
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CRVN Series
Cut Rifling
Precihole Cut Rifling Machines produce extremely accurate and precise barrels by cutting grooves using a single point cutting tool. Work piece is clamped rigidly in a self-centering vice. Servo controls ensure precision indexing and pulling to cut grooves. Cycle repeats till the intended depth of grooves is reached. Typically, depth of cut is programmed to be about 0.004 mm or 0.00015”. This rifling process can be used where very high precision and repeatability are required in the barrel for a weapon system like a sniper rifle or a match gun. This process is capable of rifling conventional grooves or 5R rifling grooves and can handle progressive or gain twists.
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BRM Series
Broach Rifling
Precihole is proud to be in a very small elite group of machine manufacturers in the world that can provide a broach rifling machine for medium and large caliber weapon systems. Broach rifling creates spiral grooves in the barrel 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.
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FCVN Series
Facing & Chamfering Machines
Precihole provides a facing and chamfering machine for barrel rods to be end machined quickly and accurately. The quality of the face and chamfer on rods is critical to achieving good straightness on the subsequent gun drilling operation. The operation is done simultaneously on both ends with special tools. This eliminates the need for the rod to be inserted into chucks on a machining center and reversing it again to machine the other side. Cycle time is around 30s for facing and chamfering resulting in high volume production. Automation for loading and unloading barrels can be added. This includes use of a conveyor or robot.
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BSP Series
Straightening Press
Barrels need to be straightened during various stages of conversion between a rod to a finished barrel. Precihole provides a compact and precise solution for this operation. Barrel blank straightness is a critical factor that determines the final accuracy of the weapon system. Barrels are long and slender shafts that bend during heat treatment, machining or stress relieving. This press helps to correct the deflection by holding the barrel in a simply supported configuration and pressing the area with the bend in the opposite direction.
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LPVN Series
Lapping
Precihole Lapping Machines lap/polish the bores and grooves in the barrel after button rifling or cut rifling. This process helps improve the surface finish by getting rid of any burr or surface deformities like deep tool or chatter marks on the ID. This is the last process in barrel ID making before chambering and profiling. The machine is capable of handling cast lead or hard nylon brush tool during operation. Choice of using cast lead or hard nylon tool depends on the level of polishing needed on the barrel.
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