Home > Products > BTA Deep Hole Drilling Machines

BTA Deep Hole Drilling Machines

Why Choose Us

Strong Machining Facility
Germany Heckert rail Grinder to assure the accuracy of machine bed. Chinese famous brand Planner, VMC, milling machine, boring machine, lathes.

Strong Technician And Experienced Assembling Team
Nationally famous technician teams are in our factory, who are good at design customized deep hole machines, heavy duty deep hole machines and high automatically deep hole machines.

Excellent After Sale Service
You can find us any time.7x24hours response system. No matter enquiry for new machine or after service for sold machine, our team will be responded within 7 hours. 《Machine quality assurance Contract》and 《After sale service contract》will be signed.

One-stop Solution
Offer best solution to customers.Answer all doubts for customers,provide photos,videos of the machine.

First 12 3 4 5 6 7 Last 1/15

BTA deep hole drilling machine,we have two types structure: transmission by rack and pinion or screw. Also for the machine bed,we have two type,one is V type and flat ,the other is two flat beds.We have advanced structure and our machine performance very good. BTA deep hole drilling range: φ16-φ80 Max.deep hole drilling depth: 5000mm Deep hole machining accuracy: Hole accurate：IT8-IT10 Hole roughness：Ra1.6-Ra6.3μm Hole deviation：1.0mm/1000mm(Job fixed，Max length and diameter ratio 50：1) 0.5mm/1000mm(Job rotating，Max length and diameter ratio 100：1)

Key Benefits of BTA Deep Hole Drilling Machines

Below are some of the common benefits of deep hole operations:
Precision and Accuracy
Since deep hole drilling operations are automated, they allow precise and accurate depth-to-diameter ratios in drilled holes. Hence, deep drilling is ideal for attaining holes with dimensions that are exact to requirements in industries such as aerospace and defense.

Improved Surface Finish
Deep hole drilling processes offer a better surface finish than conventional methods done with twist drills. Deep drilling involves the use of specialized tools and setups for high-pressure coolant flow and effective chip evacuation, ensuring the superior surface quality of the hole. Consequently, this excellent surface finish mitigates friction and wear, ensuring the durability and proper performance of moving parts.

Enhanced Tool Life
The tools used in deep-hole drilling are usually durable since they are made of super-strong materials and have unique geometries. As such, these tools can withstand wear and prevent consistent tool changes. Hence, the extended tool life of deep-hole drilling machines helps to save costs while ensuring peak productivity.

5 Different Deep Hole Drilling Tools and Technologies

The production of deep holes can be achieved with many different processes. To create a high-quality final product and keep costs under control, shops must be able to get accuracy, repeatability, and good surface finish while maintaining predictable tool life. Selecting the most appropriate tool for the job and implementing the right operating procedures can improve this difficult operation, making it productive and profitable.
Deep hole drilling is the process of machining holes with a depth to diameter ratio of greater than 10:1. Below, we'll explain 5 deep hole drilling tools and technologies: gundrilling, BTA drilling, ejector drilling, bottle boring tooling and counter boring tooling.

Gundrilling
Gundrilling is a deep hole drilling process that uses a long, thin cutting tool to produce holes at high depth-to-diameter ratios. Gundrilling is typically effective in diameters from 1 – 50 mm [~0.04 – 2.00 in]. A gundrill differs from a conventional twist drill by its unique head geometry; a standard gundrill has a single effective cutting edge that removes chips as it advances into the workpiece.
The gundrilling process can drill deep holes beyond what is possible with conventional machinery and tooling, such as twist drills, by using high pressure coolant for clean chip exhaust, even at extreme depths.

BTA Drilling
BTA stands for Boring and Trepanning Association and is also sometimes referred to as STS (single tube system) drilling. BTA drilling is a deep hole drilling process that uses a specialized drilling tool on a long drill tube to produce deep holes with a typical diameter of 20 mm [~0.80 in] and larger, and depth-to-diameter ratios of up to 400:1.
BTA drilling heads are threaded and are mounted onto long drill tubes. BTA drilling heads have multiple cutting surfaces to remove chips efficiently, exhausting them using high-pressure metal-working fluid through holes in the tool head, then out the drill tube and through the machining spindle. BTA tooling is available in brazed or inserted carbide configurations.

Ejector Drilling
This system is a variant of the BTA drilling system. Ejector deep-hole drilling is mainly used on conventional machine tools and machining centers; however, unlike BTA deep-hole drilling, there is no sealing to prevent the exit of the metal-working fluid at the workpiece. This drilling system can thus be used if it is not possible to seal the metal-working fluid circuit, e.g. for oblique boring or discontinuous workpieces. Drilling depths of up to 100 x D are possible with this process.
The metal-working fluid is fed through an annular space between the drill tube and an inner tube (double-tube system). The fluid exits from the side of the drilling head, flows over it, and then flows back into the inner tube along with the chips. Some of the fluid is introduced into the inner tube ring nozzle. The resulting underpressure at the chip mouth enables backflow (the ejector effect). An ejector cooling-lubricant feed system is required to generate the ejector effect.

Bottle Boring Tooling
A tool which is used to machine an internal profile within the length of a bore using a cutting insert, which is extended and retracted with CNC capabilities on a BTA-equipped deep hole drilling machine.
Bottle boring tools as an individual tool solution:
Specific design adaptation to your requirements
Large feed out stroke ratio (pilot bore to bottle bore inner diameter)
Maximum stability due to largest possible tool body and due to the lowest guide pad recess
Bottle boring tools as a modular system:
Multiple setup kits to increase range and different inner diameter configuration of parts
Ideal guidance in the bore through extension sets
Simple change of feed out slide
Flexibility in use of different components

Counter Boring Tooling
A tool that is used to enlarge existing bores by removing stock. This type of tooling is typically used on BTA-equipped deep hole drilling machines.
Advantages of multi-edged counterboring tools include elevated feed rates and improved workpiece quality. Constant wall thickness is often a desired result, which can be achieved by way of tool guidance in the tube (tool follows the pilot hole).

Deep Hole Drilling Applications, Processes & Advantages

Deep hole drilling (DHD) is a residual stress measurement technique that is used across various sectors to measure locked-in and applied stresses. It's often referred to as gun drilling, a prominent method in engineering materials and components. The process involves specialised equipment and knowledge to maintain the straightness and tight tolerances required for some components.

Deep hole drilling measures the distribution of stresses along the axis of a drilled hole. This process is unique in that it can measure residual stresses at a microscopic level with a penetration of over 750 millimetres (30 inches), without completely destroying the original component. Compared to other drilling techniques like centre hole drilling, DHD is considered deep.

Deep Hole Drilling Processes
Deep hole drilling uses special tools and setups to deliver high-pressure coolant, cleanly evacuate chips while achieving depth-to-diameter holes beyond what a typical CNC machine can do. This means manufacturers can reliably, accurately and efficiently achieve tolerances and production requirements.
There are several deep hole drilling processes including BTA drilling and gun drilling with additional processes specially designed for specific tolerances. These are typically performed on BTA-style deep hole drilling machines.

BTA Drilling
BTA deep hole drilling is commonly used for larger holes, around 20 – 200 mm [0.80 – 8.00 in] in diameter with high-pressure coolant around the outside of the tool. Chips are pushed through the tool centre, drill tube and machine spindle. BTA drilling is usually 5-7 times faster than gun drilling and requires a higher power output. Counter-boring can assist BTA machines as a secondary deep hole operation to drill extended diameters.

Gun Drilling
Gun drilling, on the other hand, is used to drill smaller holes usually 1 – 50 mm (0.04 – 2.00 inches) in diameter. Once more, high-pressure coolant is introduced through the spindle and centre drill. The cutting tool is a fluted solid rod with a bored hole in the centre where the coolant is injected through a hole in the middle. From there it flows back outside, through the flute and brings the chips with it.

Common Deep Hole Drilling Applications
Deep hole drilling is used on a variety of materials including the basic aluminium to super-alloys. It is capable of achieving extremely tight diameter control, straightness and superior surface finish. For that reason, DHD is more common in oil and gas exploration equipment, armaments, aerospace equipment and engines.

Advantages Of Deep Hole Drilling
The advantages of DHD far outweigh the disadvantages compared to other residual stress measurement techniques.
Semi-destructive which enables repeated stress measurements at different stages
The equipment required is portable enough to use on-site or in a laboratory
A through-thickness bi-axial residual stress distribution is measured including stress gradients
Incremental DHD can measure high magnitude residual stresses, accounting for plasticity
Applicable to simple and complex component shapes
Applicable to a wide range of metallic and non-metallic materials
Counter-rotational drilling is best for accuracy
The DHD process is fast, relative to the quantity of information produced
The extracted cylinder of material provides stress-free sample allowing for further tests and validations
Disadvantages of DHD extend to the fact that it's semi-invasive. This means the hole might need to be re-filled or you need to provide a mock-up. DHDis also not applicable through components that are less than 6 millimetres (0.24 inches) thick.

Conclusion
Deep holes are present in various applications where each one has its own set of strict requirements and unique challenges. Some might need tighter tolerances, tougher materials or a higher production goal. Considering the scope of practice, deep hole drilling requires the expertise only a few engineering companies can offer.

Considerations for Tools and Equipment for Deep Hole Drilling

Deep hole drilling can be quite complex, irrespective of the sophistication of the machinery. Also, there are higher chances of errors when drilling a deep hole. However, here are some helpful considerations for effective hole drilling:

Choosing the Right Drill Bit
Using the appropriate drill bit to drill straight holes is essential to avoid drill deviation or inaccuracies. Drilling deep holes with incompatible drill bits can result in expensive mishaps. As such, manufacturing experts often prioritize the drill bit's compatibility and durability.
However, full-face crown drill bits exhibit improved lifespan even though it is subjected to the hardness and rigidity of the material's surface. Therefore, it is advisable to use the right drill bits to drill precise and accurate holes easily.

Importance of Coolants
Coolants are crucial in deep hole drilling because they ensure proper cooling and lubrication of the hole drilling operation. These coolants help to maintain moderate temperatures, ensuring longer tool life.
These high-pressure coolants are also responsible for efficient chip evacuation from the cutting zone, preventing surface damage and chip removal strokes that may take time. Coolants allow the drilling process's productivity and improve the hole quality.

Modern Innovative Equipment
Manufacturers often use specialized equipment designed explicitly for deep-hole drilling procedures. These innovative equipment are set up to optimize the hole drilling operation for straightness and efficiency.
The technological advancement of drilling equipment allows you to attain a certain depth-to-diameter ratio since a computer controls the process. Similarly, there are different deep-hole drilling techniques with varying modes of operation. Hence, choosing the one that fits your project demands best is essential.

Gun Drilling & BTA Drilling: Ultimate Deep Hole Drilling

Gun Drilling & BTA Drilling: These are the right tools for the absolute deepest of Deep Hole Drilling. "Deep Hole” is defined by drill diameters, and specifically the depth to diameter ratio. When used properly, gun drilling can produce straight holes that are much deeper than conventional style drills are capable of.
Here's some quick information on various deep hole drilling solutions from our Deep Hole Drilling Guide:
While we can use special g-code such as the Conversational Programming of G-Wizard Editor to extend the reach on deep holes beyond Parabolic Flute Drills and Peck Drilling, to go really deep takes even more specialized tooling. Premium solid carbide twist drills are all done by 20 diameters, to maybe a bit more with hand tuned custom cycles.
Typically, Gun and BTA Drilling are done on special deep hole drilling machines that are designed for the purpose. Such machines are capable of contra-rotating both the cutting tool (Gun or BTA Drill) and the workpiece, which gives the best results on large depth to diameter ratio holes.
Gun drilling can also be done on a lathe, but the disadvantage is that the lathe can only rotate the workpiece and not the drill at the same time.
Straight deep holes are not easy!

What is Gun Drilling?
Gundrilling developed to help make straighter more accurate gun barrels. As you can imagine, deep straight holes are critical to accurate gun barrels.
It uses a fairly simple geometry solid carbide tip on a long, thin cutting tool that pumps fluid through the core of the tool to flush chips from the tip back out through generous straight flutes:
The tips are similar in geometry to solid carbide twist drills except there is no twist–the flutes are straight. Coolant under pressure forces the chips back out along the length of the grooved shaft. These tips are either solid carbide or brazed carbide–it takes a tough cutting tool to deal with these depth to diameter ratios.

Gundrilling equipment for deep hole drilling consists of
A thin cutting tool with solid carbide cutting edge(s), the gun drill itself.
Toolholding components to pump the coolant and evacuate chips.
A machine–either a lathe or a dedicated gundrilling machine.
Why does gundrilling work better for straight deep holes? It's all about the chips. In a deep hole, it gets harder and harder to remove the chips as depth to diameter ratio increases. The deeper the hole the more difficult chip removal becomes. Pumped coolant at a pressure that guarantees chips are blown back out of the hole together with an avenue the chips can move through are key.

When to Consider Gun Drilling
Among deep hole drilling solutions, choose gun drilling when:
Hole depths are greater than 20x.
Deep Holes would require reaming or honing to meet tolerances. Gun drilling requires no reaming or honing because the surface finish of the drilled hole is already very good.
With drilled diameters of less than 20mm. Larger diameter deep holes can be done more efficiently with BTA Drililng.
Deep hole drilling can be done on virtually any material when these conditions are met.
Sometimes even relatively shallow holes (by gun drilling standards) benefit from gun drilling when straightness, diameter, and surface finish requirements are high. The hole size, finish, and straightness of a gun drilled hole are all higher than with twist drilling and other deep hole drilling solutions, so eliminating a second reaming or honing op via gun drilling may save time.
Solid carbide twist drills are not always the answer.

Gun Drilling on a Lathe
While gun drilling can be done on a lathe, it is better done on a special-purpose deep hole drilling machine. The advantages of the deep hole drilling machine include the ability to rotate both workpiece and gun drill (in opposite directions), whip guides to support the long drill and workpice, plus high pressure coolant for better chip evacuation.
Contra-rotating tool and workpiece contributes to straighter drilled holes. Dedicated deep hole drilling machines also have more sophisticating monitoring of loads and coolant pressures that correctly identify when the tool is dulling and needs to be changed.

Even so, gun drilling on an ordinary lathe can still be effective. Here's a gun drill in operation on a manual engine lathe with just a mist coolant unit:
Such a simple rig will take holes to much greater depths than ordinary twist drills can reach.
Given that whipping can create a real safety hazard as well as completely destroying the gun drill, some important procedures must be followed when gun drilling on lathes without whipping guards:
Create a pilot hole at least 1 to 2 diameters deep and 0.0005 – 0.001″ larger than the gun drill.
Position the gun drill in the hole before starting rotation.
Always stop rotation before removing the gun drill from the hole.
Consider a steady rest on the lathe to help stabilize gun drills. If you don't have a steady rest, you may have to use a series of progressively longer gun drills. Try to keep less than 40 diameters length of gun drill unsupported.
When using mist instead of high pressure coolant, reduce feedrates by 60%. The smaller the hole, the more important higher pressure coolant becomes.
Gun Drills are happier with cutting oil than typical water soluble coolant used with CNC. Keep the coolant temps below 80 degrees F so you don't lose viscosity on the oil. All that is telling you is that where coolant is concerned, lubrication and keeping chips evacuated is more important than cooling.

Applications of the Deep Hole Drills

There are a variety of applications for deep hole drills, and practically every industry uses them. Each of these applications has its own set of stringent criteria and one-of-a-kind problems, such as tight tolerances, difficult materials, and aggressive production targets.
The following are some samples of common applications, processes, and tolerances. These examples are not actual part, but they are representative of what is feasible when employing deep hole drills with the appropriate machine setup, tooling, and process understanding.

Fuel Injector Bodies
For high-precision, high-volume items, it is possible to make the many holes at the exacting tolerances necessary by using a 3-spindle gundrilling center that is automated with robotics and conveyors.

Fuel Rails for Diesel Engines
Gasoline rails ought to have very small holes that are completely straight and won't break when subjected to the pressure of the gasoline. The utilization of gundrilling makes it feasible to bore holes that are in accordance with these very stringent requirements, which are quite exact.

Sheet for Heat Exchangers in Tube
It is feasible to correctly drill thousands of holes in a short period of time using a multi-spindle tube sheet drilling machine, maximizing productivity in the process. This is accomplished by drilling the holes one at a time.

Equipment Used for Landing an Aircraft
Drill and shape the landing gear actuating cylinders using high-strength alloys while preserving an exceedingly tight straightness tolerance.

Fluid Assembly Ends
In order to construct the apparatus needed for hydraulic fracturing, a block of steel is given a number of holes that need to be drilled into it. There is a need for machines and equipment that can meet the challenge posed by a substantial workpiece that also has accurate tolerances.

Hydraulic Cylinder Inside Bore
To produce superior hydraulic cylinders, an existing bore should be finished to the point that it satisfies the requirements for a surface polish that is as reflective as a mirror.

Oilfield Exploration Equipment
It is possible to drill holes in long workpieces with extraordinary depth-to-diameter ratios without making compromises the accuracy of the roundness or wall thickness of the holes. This is accomplished by using a drill bit with a larger diameter than its depth.

Exploration of the Oil Field Downholes
Trepan holes may be drilled in long workpieces with extraordinary depth-to-diameter ratios without affecting the accuracy of the hole's roundness or wall thickness. Trepan holes are named for the trepan tool, which was developed in the 19th century.

Our factory

Dezhou Guanlu Precision Machinery Co.,Ltd is founded in 2011,its main business is manufacturing: Gun drilling machine,deep hole drilling machine,BTA deep hole drilling machine,deep hole skiving burnishing machines,deep hole honing machines and toolings.Our factory had about 50 workers,10technical engineers,15000square meters workshop.

productcate-1-1

FAQ

Q: What are the advantages of deep hole drilling machine?

A: Deep hole drilling uses special tools and setups to deliver high-pressure coolant, cleanly evacuate chips while achieving depth-to-diameter holes beyond what a typical CNC machine can do. This means manufacturers can reliably, accurately and efficiently achieve tolerances and production requirements.

Q: What is the difference between gun drilling and BTA drilling?

A: BTA stands for Boring and Trepanning Association. BTA Drilling can achieve feedrates that are 5-7 times that of Gun Drilling, hence it can deliver a lot faster boring cycle. The downside is the tooling is bulkier, so it can only be used on larger diameter holes.

Q: What are the advantages of drilling machines?

A: Firstly, they require low maintenance, as the operation and repair can be done easily by the manual feed. Another advantage is that these machines help in eliminating unwanted material from the work. Lastly, the drilling machines are highly portable and can be moved from one place to another, if required.

Q: Which type of drill is used for deep hole drilling?

A: There are two primary tooling types used to produce deep holes, Gundrilling and BTA drilling. The requirements of these tools dictate the design and systems of the deep hole drilling machines that use them.

Q: What is deep hole drilling used for?

A: Deep hole drilling is used in a variety of materials from aluminum to super-alloys, and is capable of achieving tight diameter control, straightness, and superior surface finish into workpieces.

Q: What is the purpose of deep drilling?

A: Deep drilling and ore-mining allows examining the microbial communities that thrive several thousand meters below the surface. Microorganisms at these depths are often classified as extremophiles.

Q: What are the three types of drilling machines?

A: There are many different types or configurations of drilling machines, but most drilling machines will fall into four broad categories: upright sensitive, upright, radial, and special purpose.

Q: What is the full form of BTA machine?

A: BTA tooling is available in brazed or inserted carbide configurations. BTA stands for Boring and Trepanning Association, and is also sometimes referred to as STS (single tube system) drilling, as it uses one single drill tube for the BTA tool, compared to other processes such as ejector drilling, which use two.

Q: What are the three types of drilling methods?

A: The main types of drilling systems include rotary drilling, percussion drilling, and rotary-percussion drilling. Rotary drilling involves a rotating drill bit, percussion drilling uses a hammering action, and rotary-percussion drilling combines both methods to penetrate various soil and rock conditions.

Q: What are the three types of drilling machines?

A: There are many different types or configurations of drilling machines, but most drilling machines will fall into four broad categories: upright sensitive, upright, radial, and special purpose.

Q: What is a deep hole drilling machine?

A: A deep hole drilling machine is a metal-cutting machine tool, designed to produce very deep, precision holes into virtually any metal. Deep hole drilling machines enable the performance of specific tools such as BTA and gundrills, to optimize the deep hole drilling process for manufacturers.

Q: What are the categories of drilling machines?

A: The capacity of the drilling machine is determined by the size of the largest workpiece on which the spindle can be centered. Drilling machines can be categorized into five major classes- upright, radials, horizontals, turret drills, and multiple-spindle machines.

Q: What are the four main types of drilling?

Q: Which types of drills are known as deep hole drills?

A: Deep hole drilling is the process of machining holes with a depth to diameter ratio of greater than 10:1. Below, we'll explain 5 deep hole drilling tools and technologies: gundrilling, BTA drilling, ejector drilling, bottle boring tooling and counter boring tooling.

Q: What are the different types of deep drilling?

A: Deep hole drilling methods
Single-lip deep hole drilling. Principle of single-lip deep hole drilling. ...
BTA deep hole drilling. Principle of the BTA deep hole drilling method. ...
Ejector deep hole drilling. Process principle for ejector deep hole drilling.

Q: What are the methods of deep hole drilling?

A: Deep hole drilling
The classic deep hole drilling processes are single-lip drilling, STS drilling and ejector drilling. These processes are all based on an asymmetrical tool design and differ predominantly in the supply of cooling lubricant and in the removal of the mixture of cooling lubricant and chips (swarf).

Q: What is the most common drilling machine?

A: The most commonly used drilling machine is a single-spindle, floor-mounted, belt-driven machine for non-production drilling. Belt-driven spindles may require manual belt shifting for spindle speed changes. Feed rates are also adjustable and may be manual or automatic.

Q: Which type of drilling machine does a carpenter use?

A: As per the name, a breast drill essentially has a chest plate at the end for extra support and pressure while drilling. With this, you can drill into comparatively harder surfaces when compared to a hand drill. Breast drilling machines are used in carpentry.

Q: What are the two most common types of drilling method?

A: Two Primary Drilling Techniques: Percussive Drilling and Rotary Drilling. Drilling is a cutting operation which uses a drill bit to cut a hole of a circular cross-section in a solid material. It is helpful in drilling water wells, oil wells, and natural gas extraction wells.

Q: What are the six 6 operations that are commonly performed on drilling machines?

A: The operations that are commonly performed on drilling machines are drilling, reaming, lapping, boring, counter-boring, counter-sinking, Spot facing, and tapping. This is the operation of making a circular hole by removing a volume of metal from the job by a rotating, cutting tool called drill.

As one of the leading bta deep hole drilling machines manufacturers and suppliers in China, we warmly welcome you to wholesale cheap bta deep hole drilling machines for sale here from our factory. All customized products are with high quality and competitive price.