Deep Hole Drilling

1
Deep Hole Drilling Solutions
Robust  Reliable Repeatable

• Deep Hole Drilling Machines
• Machines by Process
• Machines by Industry

Visit- www.precihole.com
2
Machines By Process
Explore Machines by Tooling / Process
Precihole Machines are available with variety of
Tooling's based on production and application
requirements. Machines are optimized to run at
best parameters with the appropriate tooling's.
Visit- www.precihole.com
3
Machines by Process
Gun Drilling
BTA Drilling
This system is generally used from holes that are
from Ø1 mm up to Ø40 mm in size with L/D ratios
of up to 200. High pressure coolant passes
internally through the tube and flushes out the
chips externally though the a V Shaped groove.
This is a Single Tube System (STS) in which high
pressure coolant is supplied to the cutter
through the annular area between the drilled hole
and tube OD. Chips are evacuated from inside the
cutting tube. Metal removal rates are generally
much higher than gun drilling. This technology is
used for holes from Ø12 mm to Ø250 mm in size.
Visit- www.precihole.com
4
Machines by Process
Counter Boring
Ejector Drilling
Ejector drilling is similar to BTA drilling but
instead of a single tube it consists of two
tubes. Coolant is fed from the outer tube and the
chips and coolant after drilling are flushed from
the inner tube.
Counter boring enlarges an existing hole.  It
covers a range up to Ø500 mm hole size. Number of
cutting edges on the tool vary depending on the
amount of material to be removed from the part.
Once the tool enters the hole, the pads support
the finished diameter.
Visit- www.precihole.com
5
Machines by Process
Bottom Forming
Trepanning
Trepanning is a process that removes a solid core
from the ID of a cylindrical workpiece. The tool
cores out a solid cross section. This technology
is used for parts that use exotic and expensive
materials in which the core can be reused for a
smaller size part.
This process is used to profile the bottom of a
blind hole. A special profile tool is used to
generate the required profile at the end. This
requires an existing blind hole be present in the
work piece.
Visit- www.precihole.com
6
Machines by Process
Pull Reaming
Skiving Roller Burnishing
Skiving and Roller burnishing a high-speed
process to finish hydraulic cylinder tubes.
Skiving cutter shaves of a bit of the OD and the
roller burnishing pads put hydraulic pressure on
the cut surface to burnish it and improve surface
finish. This process is about 40-50 times faster
than honing.
Pull reaming is used to improve straightness and
accuracy of long holes. The reaming tool is
rotated and pulled through the drilled hole. The
surface finish as well as size of drilled hole is
improved using this process.
Visit- www.precihole.com
7
Machines by Process
Honing
Pull Boring
Pull boring is being used mainly to have very
straight and accurate long holes. The oil is fed
similar to BTA drilling or counter boring i.e.
through the pressure head. This has guide pads
which are supported in the pre-bore, thus
producing the enlarged bore on the original axis.
Honing is a process that uses Silicon Carbide ,
Aluminum Oxide, CBN or Diamond tools to polish
the ID of a cylindrical shaft . These tools are
mounted on a mandrel that is rotated and
reciprocated at the same time. Expansion of the
mandrel is controlled by servo controls or
hydraulically. Honing gives a surface finish of
0.1 Ra or better in most cases.
Visit- www.precihole.com
8
Machines by Industry
Explore Machines by Industry
With 3 decades of experience, Precihole has
supplied Machines to various industry segments.
If your industry requires an application in deep
hole drilling, Precihole has a solution. Standard
as well as Custom build solutions for specific
industry applications that ensure the required
hole specifications are met.
Visit- www.precihole.com
9
Machines by Industry
Defense
Automotive
Precihole solutions for automotive industry are
designed to work in 24 X 7 mode with minimal
downtime combining aspects like close tolerances
and high volume production using various types of
automation.
Precihole has over three decades of experience
with providing hole generation and hole finishing
solutions for all calibers of artillery barrels
and other parts in Defense industry.
Visit- www.precihole.com
10
Machines by Industry
Oil Gas
Aerospace
Deep Hole Drilling applications for aerospace
industry are complex and require super precision
output parameters. A combination of multiple
processes on same machine are also required.
Precihole machines are designed with all these
needs in mind.
Precihole solutions for Oil Gas are perfectly
tuned to optimize drilling on exotic materials
like Stainless Steel, Duplex and Inconel used in
that Industry. Machine specs and design are
customized to suit the needs of the application
on a project to project basis.
Visit- www.precihole.com
11
Machines by Industry
Die Mold
Hydraulic Cylinders
Preciholes Skiving and Roller Burnishing
solutions are ideally suited to high volume
manufacturing needs of hydraulic cylinder
manufacturers while controlling surface finish
and wall thickness variation in check.
Preciholes solutions for the die and mold
industry includes innovative and cost-effective
solutions for precision manufacturing of mold
plates in the fastest possible time with high
efficiency. 
Visit- www.precihole.com
12
Machines by Industry
Firearms
Energy
Precihole firearm solutions include gun drilling,
pull reaming and rifling machines that are
capable of holding tolerance to produce highly
precise match grade barrels
Preciholes solutions for energy industry combine
versatility as well as accuracy for applications
like windmill turbine shafts or baffle plates
used in heat exchangers.
Visit- www.precihole.com
13
Machines by Industry
Medical Implants
Preciholes Medical implant solutions include
various features that allow precise drilling in
material like Titanium and Stainless Steel which
are frequently used in these applications.
Visit- www.precihole.com