FEIN core drill finder

The vertical range of manufacture in Germany is approx. 80%. The majority of our core drilling machines are therefore labelled "Made in Germany". Industrialised models are assembled at our site in India.

Weldon 32, Weldon 1-1/4", M18, Universal (WelNit, FullUniversal, One-Touch, Fusion II)

FEIN tests its core drilling machines at a maximum outside temperature of -10° C. However, the machine should have been stored in a warm place beforehand. The machine must also not be transported in the vehicle for too long at sub-zero temperatures.

Yes, more than 90% of core drills worldwide have a 3/4 in Weldon chuck. This is the most common core drill holder on the market. FEIN 3/4 in core drills fit any core drill with a 3/4 in Weldon holder.

In principle, this is possible with HM and HSS core drills. However, this requires a special grinding machine and the necessary rake and clearance angles. There are special grinding companies that specialise in resharpening/regrinding. As a rule, however, HM and HSS core drills are not resharpened or reground. The costs for this are close to those of a new purchase.

As a rule, magnetic core drills cannot be used directly on chequer plate. This is due to the uneven surface, which prevents sufficient adhesion of the magnet. One solution is to use a vacuum plate in combination with a vacuum pump. The vacuum plate is securely fixed to the corrugated surface with the help of a foam rubber lip using negative pressure. The magnetic core drilling machine can then be attached to the vacuum plate - this time the magnet adheres to the ferromagnetic surface of the plate. This means that even corrugated material can be drilled safely and precisely.

Magnetic core drills cannot generally be used directly on aluminium, as aluminium has no magnetic properties. This means that the magnetic base of the machine does not adhere, making safe working impossible. One solution is to use a vacuum plate in combination with a vacuum pump. The vacuum plate is securely fixed to the aluminium workpiece using negative pressure. The magnetic core drilling machine can then be attached to the vacuum plate - this time the magnet adheres to the ferromagnetic surface of the plate. This means that even non-magnetic materials such as aluminium can be drilled safely and precisely.

Magnetic core drills cannot generally be used directly on stainless steel, as stainless steel has no magnetic properties. This means that the magnetic base of the machine does not adhere, making safe working impossible. One solution is to use a vacuum plate in combination with a vacuum pump. The vacuum plate is securely fixed to the stainless steel workpiece using negative pressure. The magnetic core drilling machine can then be attached to the vacuum plate - this time the magnet adheres to the ferromagnetic surface of the plate. This means that even non-magnetic materials such as stainless steel can be drilled safely and precisely.

Drilling Hastelloy C22 with a carbide ULTRA SPEED core drill is possible in principle, but is associated with some important restrictions and requirements. Hastelloy C22 is a highly corrosion-resistant nickel-chromium-molybdenum alloy that is very difficult to machine. Here are some points to consider: 1. carbide ULTRA SPEED core drill Material: carbide with special TiAlSiN coating Geometry: optimised cutting edge geometry for difficult-to-cut materials Stability: the core drill must run very stably and with low vibration to avoid material hardening. 2. cutting parameters Low cutting speed: Hastelloy tends to work harden, therefore a significantly reduced speed should be used. Feed rate: A constant, relatively high feed rate is important. The material must be drilled through in one go. 3. cooling Intensive cooling is essential - ideally with an internal coolant supply to dissipate the heat directly at the cutting edge and increase tool life. In terms of tool wear, this will be slightly more favourable for the coated KB.

Inconel 718 is a high-strength nickel-chromium alloy that is characterised by its exceptional toughness and heat resistance. However, these properties also make it extremely difficult to machine. A decisive advantage when machining this material is the use of TiAlSiN-coated core drills (HM ULTRA SPEED). This coating significantly reduces the friction between the tool and the workpiece, which means that less heat is transferred to the cutting edge and the material. This is particularly important as high-alloy nickel-chromium alloys such as Inconel 718 tend to work harden if not machined properly - an effect in which the material hardens due to plastic deformation, making it even more difficult to machine. To counteract this effect and increase tool life, effective and continuous cooling is essential throughout the entire machining process.

If core drilling is only carried out in the diameter range of 12 - 35 mm, it is sufficient if the machine only has one mechanical speed. This is usually approx. 450 / 500 rpm (KBE 32 / KBE 32 QW) Some core drilling machines are also equipped with an electronic speed setting. Here it is possible to reduce the mechanical speed by up to 50%. However, it should be borne in mind that a slower speed also means less motor cooling through the fan wheel (KBU 35 Q / KBU 35 QW). 2nd gear machines are used in the diameter range from 12 - 65 mm. The two speed levels of approx. 250 / 500 rpm allow the speed to be adapted to the core drilling diameter and are also significantly more versatile in terms of the material to be drilled (KBM 50 Q, KBM 50 U, KBM 65 U / KBM 50 UQW, KBM 65 UQW).

Depending on the respective mounting system of the core drill or core drill bit. FEIN offers suitable adapters and centring pins for both machines / core drills with 3/4in Weldon or FEIN QuickIN in order to change to the other system.

Yes, the machine should be regularly blown out and cleaned of swarf. The dovetail guide must also be adjusted regularly. To do this, briefly loosen the worm screws on the drill stand, loosen with a rubber mallet and then retighten the worm screws. Ensure that the drill motor of the core drill is at the same height as the worm screw to be retightened. The dovetail guide is correctly adjusted if the drill motor does not slide down independently or the feed can be carried out with a comfortable force.

Yes, using the AKBU 35 PMQ / AKBU 35 PMQW with a ProCORE Li-ion battery 18V / 8 Ah enables up to 31 core drill holes at Ø 18 mm in S235, 12 mm thick.

Yes, using the AKBU 35 PMQ / AKBU 35 PMQW with a ProCORE Li-ion battery 18V / 12 Ah enables up to 48 core drill holes at Ø 18 mm in S235, 12 mm thick.

Yes, FEIN has been manufacturing HSS core drills independently at our production site in the USA since 1977. Decades of experience from which you benefit. FEIN has had a strategic development partnership for carbide-tipped core drills since 1984.

The output of the generator should be more than twice the rated output of the respective machine. Due to the variety of generators and emergency power generators on offer, the function cannot be guaranteed in individual cases.

Machining HARDOX with a FEIN KBM / KBU and a FEIN HM ULTRA core drill is only possible up to the HARDOX 400 class. The coated HM ULTRA SPEED core drill should be used for HARDOX 450.

A vacuum plate and pump must be used for anti-magnetic workpieces, such as those made of stainless steel. Place this on the workpiece and then place the magnetic core drill on it. Carbide-tipped HM ULTRA core drills or TiN-coated HSS NOVA core drills are primarily suitable for stainless steel. Ensure that the speed is set correctly.

There are clamping systems on the market with tool-free core drill change, such as QuickIN, but also machines with manual core drill change.

• Manual core drill change: Switch off the machine and pull out the mains plug. Wear gloves. Loosen both hexagon socket screws (3/4 in Weldon). Pull out the core drill downwards. Pull the centring pin out of the core drill. Insert the centring pin into the new core drill and then insert the core drill into the holder. Ensure that both clamping surfaces are positioned at the respective screw points. Now tighten the hexagon socket screws.

There are clamping systems on the market with tool-free core drill changing, such as QuickIN, as well as machines with manual core drill changing.

• To change the core drill without tools: Switch off the machine and pull out the mains plug. Use gloves. Hold the core drill firmly. Pull or turn the clamping sleeve downwards. Pull out the core drill downwards. Pull the centring pin out of the core drill. Insert the centring pin into the new core drill and then pull or turn the clamping sleeve downwards. Insert the core drill into the holder and release the clamping sleeve. Then turn the core drill until it audibly engages and the clamping sleeve springs upwards.

When working with magnetic core drills, special care must be taken to maximise the service life of the tools and to ensure the safety and precision of the drill holes. A key aspect is the selection of the correct core drill, which must always be matched to the material to be processed. If an unsuitable drill is used, this can lead to insufficient drilling performance or even tool breakage. The core drill itself should always be handled with care. It should only be transported and stored in the packaging provided to prevent damage. Even a slight knock can cause the sensitive cutting edges to break. The material to be drilled also plays an important role: it should not be thinner than 12 mm. If the material is too thin, the magnetic holding force of the machine cannot be effective enough. As a result, the machine can become misaligned during the drilling process, which can lead to cutting edge breakage or even to the drill bit breaking off at the shank. The surface on which the machine is set up must be level, clean and free of scale. Only then can the magnetic base rest on the entire surface and develop its maximum holding force. An uneven or dirty surface harbours the risk of the machine shifting - with the known consequences for the tool and workpiece. It is equally important that the guides on the machine are adjusted without play.  If there is play, the drill bit can chatter during drilling, which in turn can lead to chipped cutting edges or broken shanks. A centring pin should always be used to reliably eject the drill core. Another critical point is cooling. During drilling, sufficient cooling - ideally with drilling emulsion - should always be provided via the machine's lubrication system provided for this purpose. The internal cooling of the drill bit ensures that the cutting edges do not overheat, become blunt or break out. Careful positioning of the drill bit is important when drilling and the drilling process should be carried out in one go if possible. Interruptions or a too hard approach can lead to chattering and thus to tool damage. The machine must not be switched off during drilling, as this can also lead to chattering. Overlapping holes should be avoided, as the cutting edges can catch in the first hole. Small impacts occur during re-entry, which damage the cutting edges. Drilling close to weld seams or separating cuts made by cutting torches is also problematic. The high temperatures generated there can change the structure of the material and significantly accelerate the wear of the core drill.

The prerequisite for a secure stand of the magnetic core drilling machine is a secure hold of the electric or permanent magnet. For this, the workpiece surface must be even, clean and > 12 mm thick. If the material surface is thin, uneven, dirty, painted or scaled, the magnetic holding force is significantly reduced. If the air gap between the material and magnet is 0.2 mm, the magnetic holding force is reduced to approx. 80%. With an air gap of 0.4 mm, the holding force is reduced to 66% and at 0.6 mm it is only 43%. Many FEIN core drills are equipped with a magnetic holding force indicator. This helps the user to position the machine carefully. If the holding force indicator flashes, drilling must be carried out with reduced feed force and increased caution.

The optimum speed depends on the material to be drilled, drill diameter and core drill type, such as carbide or HSS. Rule of thumb for magnetic core drills Material Ø 20 mm Ø 40 mm Mild steel 450 rpm 225 rpm Stainless steel 300 rpm 150 rpm Aluminium 600 rpm 300 rpm

Core drills should be stored without impact and shock. Ideally in the packaging provided. Check the core drill for damage and broken cutting teeth. Store the drill bits dry and protected from moisture. Use suitable coolants during drilling.

A minimum material thickness of 12 mm is required for an electromagnet. The installation surface should also be flat, rust-free and unpainted. If there is no air gap between the workpiece and the magnet, a holding force of 100% is achieved. If there is an air gap of 0.2 mm, the holding force is only 80%. With an air gap of 0.4 mm 50%. At 0.6 mm only 30%.

The speed influences the cutting speed and heat development. Too high a speed can lead to overheating and tool wear. The optimum speed depends on the material and the drill diameter.

Tip: If possible, always use the internal coolant supply. This is the only way to ensure that the coolant also reaches the cutting edges during the drilling process. Cutting oil, coolant concentrate or drilling emulsion are suitable coolants.

Dependent on many influencing factors such as speed, feed force, material to be drilled, condition of the core drill, use of coolant.

FEIN HM ULTRA: Maximum service life of the core drill 400 holes = 8 m total service life (determined under optimum conditions (Ø18 mm, S235 20 mm)

FEIN HSS NOVA: Maximum service life of the core drill 140 holes = 2.80 m total service life (determined under optimum conditions (Ø18 mm, S235 20 mm)

ProCORE Li-ion battery 18V / 12 Ah enables up to 48 core drillings at Ø 18 mm in S235, 12 mm thick. ProCORE Li-ion battery 18V / 8 Ah enables up to 31 core drill holes at Ø 18 mm in S235, 12 mm thick.

Core drills that have two clamping surfaces offset by 90° and whose shank has a diameter of 19.05 mm (3/4 in) are described as core drills with a 3/4 in Weldon shank. Core drills that have four circular recesses in their shank (Ø 18 mm) are referred to as QuickIN core drills.

Yes, use a multi-layer core drill of the type HSS SPECIAL. The special cutting geometry produces a cylindrical core without a protruding rim. This saves a lot of time, as several layers of steel can be drilled in one operation without having to remove the core every time. Ideal for remodelling work on existing structures and in vehicle frame construction.

The appropriate centring pin depends on the adapter length and the overall length of the core drill. For core drills with a cutting depth of 25 or 35 mm in conjunction with an adapter, a 125 mm long centring pin is recommended. For core drills with a cutting depth of 50 mm in conjunction with an adapter, a 135 mm long centring pin is recommended.

It is important to avoid switching off the machine in the drill hole. Excessive force is exerted on the cutting edges when restarting. Always ensure that the core drill is moved out of the drill hole before the machine is switched off.

Every overlapping hole causes knocks and impacts on the cutting tooth. The distance to the already drilled hole should always be selected so that the centring pin hits the material to be drilled again. Work with reduced feed force as long as the cutting surface has not yet formed. As a circular core is not formed, the core tends to jam in the core drill during ejection.

Yes, the KBE models are designed for efficient core drilling. The machines allow maximum core drill cutting depths of 50 mm. The stroke range is also designed accordingly. This does not allow the use of a drill chuck for twist drilling. If you still want to twist drill with a KBE, you can use HSS twist drills with a 3/4in Weldon chuck. These are available in diameter sizes 5 - 16 mm with a cutting depth of 35 mm.

The respective maximum service life of the core drill, which was determined under optimum conditions (correct speed, optimum feed force, sufficient cooling, backlash-free machine guidance) in steel S235.

• HM ULTRA SPEED, Ø18 mm, in S235 material thickness 20 mm: approx. 370 drill holes = 7.4 m Total service life
• HM ULTRA, Ø18 mm, in S235 material thickness 20 mm: approx. 400 drill holes = 8 m Total service life
• HSS DURA, Ø18 mm, in S235 material thickness 20 mm: approx. 170 drill holes = 3.4 m total service life
• HSS NOVA, Ø18 mm, in S235 material thickness 20 mm: approx. 140 drill holes = 2.8 m total service life
• HSS SPECIAL, Ø18 mm, in S235 material thickness 20 mm: approx. 120 drill holes = 2.4 m total service life

A dovetail guide (JMU 137 series, KBM 50/65 series, KBU 110-4M ) that is not optimally set or not readjusted can lead to inaccurate feed and vibrations, which can impair the drilling quality. Incorrect speeds or an inappropriate feed rate lead to excessive tool wear, poor drilling quality or even breakage of the drill bit. Poor concentricity of the spindle causes imbalance, which has a negative effect on the precision and service life of the tool. If there is play in the tool holder, the tool cannot be guided stably, which leads to vibrations, uneven running and increased wear. Insufficient magnetic holding force - caused by rust, paint, dirt or uneven surfaces - jeopardises the secure positioning of the machine and can lead to slipping or incorrect drilling.

Regularly readjust, lubricate and adjust the dovetail guide. Check coolant system for flow and blockages. Keep the magnetic surface flat. Regularly remove chips from the machine and blow out.

Poorly machinable material with high tensile strength.

• Materials such as high-alloy steels place high demands on the machine and tool. If the wrong cutting speeds or feed forces are used, the machine may suddenly jam or even break.

Heavily scaled surface

• Scale forms a hard, brittle layer on the material. This can damage the drill bit or lead to snagging if it breaks - there is also a risk that the machine will break off suddenly.

Uneven or dirty magnet installation surface.

• Rust, paint, dirt or chips under the magnetic base significantly reduce the holding force. This can lead to vibrations, inaccurate drilling or even to the machine slipping during the drilling process.

Due to the large number of different welding devices and the lack of clearly defined ignition voltages, we have to follow the recommendations of welding device manufacturers to work without high-voltage ignition in conjunction with electronic systems. Nevertheless, when developing our core drilling machines, we paid attention to high interference immunity. The electronic components in the machine were tested in the laboratory with an air discharge (test voltage 15000V) and a contact discharge (test voltage 8000V) and were still OK after the test. The manufacturers of welding equipment have different pulse voltages for igniting the welding electrode, which means that our machine can still function when welding equipment from one manufacturer is used simultaneously in the pulse process, but the electronics are destroyed in the other. The ambient conditions can be optimised to enable use together with welding equipment.

1. It must be ensured that the welding equipment is in a technically perfect condition, i.e. in particular radio interference suppression, protective conductor connection, setting of the ignition voltage, ...

2 The workshop installation must be set up in accordance with the applicable regulations (in particular protective devices).

3. the welding circuit must be set up in accordance with regulations (earth connection), it is not permitted for a welding current to flow via the protective conductor of the core drilling machine.

4. the core drilling machine must be in a technically perfect condition, in particular the protective earth connection However, we cannot provide a guarantee for the above reasons. If the machine is switched off (‘magnet’ switch off), the electronics will not be damaged by welding. Only the protective earth conductor of the machine can burn out if the earth terminal is missing (see point 3 above). If the electronics are defective, the fuse for the mains installation will probably also blow. The electronics themselves cannot be repaired. Other parts of the machine are not affected. Other faults that can occur during ignition but do not lead to a defect:

• Drill motor starts up briefly during the ignition process (only if machine is in restart lockout).
• Drill motor changes speed.

Damaged or worn drill bits not only impair the drilling quality, but also increase the risk of tool breakage and machine stress. They should be checked regularly for wear and replaced in good time. In addition, the use of non-original accessories can lead to fitting inaccuracies, insufficient stability and, in the worst case, damage to the machine. Only tested original accessories guarantee safe and reliable operation.

An internal or protected drill motor cable offers numerous practical and safety-related advantages in the daily use of a core drill. As the cable is laid in the housing or in a protected guide, it is reliably protected from external influences such as sharp edges, hot swarf, flying sparks or accidental snagging. This significantly reduces the risk of cable breakage or damage to the insulation. Another significant advantage is the increased work safety. A damaged or exposed cable can lead to electric shocks or short circuits - especially in harsh environments such as construction sites or metalworking companies. Protected installation significantly minimises this risk. The reduced mechanical load also extends the service life of the cable. This means less maintenance, lower repair costs and greater overall reliability of the machine. Handling is also improved by the internal cable: it does not interfere with work, does not get tangled and does not get caught on edges or workpieces - a clear advantage when working in confined spaces or overhead. Last but not least, an internal cable contributes to a tidy and professional appearance of the machine, which is important in commercial use.

Possible causes:

• Insufficient magnetic holding force, i.e. machine moves slightly, vibrates, wobbles or shifts on the material to be drilled.
• Too much play in the guide, i.e. the core drill has poor concentricity and is loaded on one side.
• Too little or no coolant used, i.e. core drill jams in the drill hole.

Possible causes:

• Insufficient magnetic holding force, i.e. machine moves slightly, vibrates, wobbles or shifts on the material to be drilled.
• Too much play in the guide, i.e. the core drill has poor concentricity and is loaded on one side.
• Too little or no coolant used, i.e. core drill jams in the drill hole.

There may be several reasons for this:

• The machine guide has too much play and needs to be readjusted.
• The core drill has one or more damaged cutting teeth or they are missing completely.
• The speed is too high, the core drill is too fast for the material to be drilled and cannot engage with the material.

This primarily indicates an insufficient coolant supply. Good cooling should always be ensured when core drilling. Cooling should always take place via the lubrication device provided on the machine. This ensures internal cooling of the core drill cutting edges. If the material is too hard and the wrong core drill is used, unwanted heat development can cause the core drill cutting edges to anneal. It is essential to use carbide-tipped core drills for materials that are difficult to machine.

The high temperatures can lead to structural changes in the workpiece material. This can cause core drills to wear significantly faster.

The high temperatures can lead to structural changes in the workpiece material. This can cause core drills to wear significantly faster.

This leads to a reduced magnetic holding force. Even with the lowest feed force, the machine can lift off or slip. This represents a high work risk for the user.

This leads to a reduced magnetic holding force. An air gap of just 0.1 mm between the magnet and the workpiece surface significantly reduces the magnetic holding force.

Yes: A tool-free core drill change enables the insert tool to be replaced in seconds. This offers great advantages when several different drill diameters need to be drilled on one component/workpiece. In addition, there is no need to carry an Allen key and there is no annoying loss of fastening screws (worm screws).

No: For cutting depths of 110 mm, the use of a manual clamping system is recommended for reasons of clearance and the drilling behaviour of the core drill when it hits the material.

Insufficient cooling or lubrication leads to excessive heat build-up, which significantly shortens the service life of the drill bit and impairs the drilling quality. Overloading due to excessive feed force can damage the tool or even cause the machine to break. Inexperienced users are more prone to operating errors, which impairs safety and precision. Inadequate care and maintenance, especially during storage, can lead to corrosion, wear and malfunctions. Never work without a centring pin, as this is essential for exact positioning and safe ejection of the drill core.

Choosing the right machine, the right accessories and correct use are crucial for productivity, safety and tool life. A well-maintained and correctly used magnetic core drilling machine is a powerful tool in the workshop and on the construction site..

Common sources of faults are incorrect speed, excessive feed force, poor machine stability, a guide with too much play and insufficient cooling. A backlash-free guide can be achieved through regular maintenance.

The correct machine must be selected taking into account the work location, accessibility, application, drilling diameter, material thickness and number of drill holes.

• A small, lightweight machine is required for work on site and at the construction site. If maximum mobility is also required, a cordless magnetic core drill is recommended. When working in the workshop, a somewhat larger and heavier magnetic core drill is generally used, as mobility and long transport distances are less important in the workshop.
• If the work takes place in confined and difficult to access situations, a KBC 36 compact machine with a fixed angular gearbox and fixed height should be used. If, on the other hand, you have free and easy access to the workpiece, we recommend using a KBM / KBU machine with a freely movable drill motor.
• If you only need the machine for core drilling, then a machine with clockwise rotation and a low stroke range (KBE) is sufficient. If, in addition to core drilling, you also want to carry out universal work, such as twist drilling, tapping, reaming and countersinking, then you need a machine with R/L rotation, speed adjustment and a large stroke range (KBM, KBU).
• The most important core drill diameters for carbide and HSS in steel and metal construction are between 16 - 32 mm. A machine with a maximum drilling capacity of 35 mm is sufficient for this. Larger drilling diameters are predominantly required for work in mechanical engineering, boiler/tank construction or shipbuilding.
• Material thicknesses up to 50 mm can be achieved with all FEIN core drilling machines (exception KBC 36 MAGFORCE: only 35 mm). For material thicknesses > 50 mm, machines with an MK tool holder are required. A shank available as an accessory enables cutting depths of up to 75 mm (with KBU 110 even up to 100 mm). If a cutting depth of 75 mm or 100 mm is still not sufficient, the MK tool holder also allows you to use commercially available twist drills with various cutting depths.
• The use of an automatic machine (KBM 50 AUTO QW / KBM 50 AUTO) is recommended for serial core drilling work and large drilling volumes. This relieves the user, as he only has to carry out one control function. It also increases the service life of the core drills, as the feed force and feed speed are always optimised. For occasional work and manageable drilling volumes, a manual core drill is generally used.

FEIN has divided its core drill programme into 4 performance classes. The two letters KB stand for core drill. The third letter indicates the functionality of the performance class. Here A stands for Automatic. These are fully automatic core drilling machines that offer maximum efficiency and minimum physical strain during core drilling work.

FEIN has divided its core drill programme into 4 performance classes. The two letters KB stand for core drill. The third letter indicates the functionality of the performance class. Here C stands for Compact. These are size-optimised core drilling machines that are optimised for use in confined working situations. They have R/L rotation and, in addition to core drilling, can also be used for twist drilling, tapping, countersinking and reaming.

FEIN has divided its core drill programme into 4 performance classes. The two letters KB stand for core drill. The third letter indicates the functionality of the performance class. Here E stands for Endurance. These are durable core drilling machines that are optimised for efficient core drilling. They only have clockwise rotation and therefore only have the functionality for core drilling.

FEIN has divided its core drill programme into 4 performance classes. The two letters KB stand for core drill. The third letter indicates the functionality of the performance class. Here U stands for Universal. These are extremely versatile core drilling machines with an extra-large stroke range. Thanks to R/L rotation and electronic speed adjustment, twist drilling, tapping, countersinking and reaming are possible in addition to core drilling.

The world's most common core drill holder with a market share of more than 90%. Also known as 3/4 in Weldon, Weldon 3/4, Weldon, Weldon 19 mm, Weldon 19, Straight Shank, 3/4". Characteristics: Two flat clamping surfaces offset by 90°. Shank diameter 19.05 mm.

QuickIN is a core drilling attachment developed by C. & E. FEIN GmbH in 1999. Larger market share in the D-A-CH region. Based on a cylindrical shank Ø 18 mm with four circular recesses, each arranged at 90°.

FEIN core drilling machines prior to the year 2000 had this core drill holder as standard. Meaning of the designation M18 × 6 P 1.5: M18: This is a metric thread with a nominal diameter of 18 mm. 6: In this context, usually stands for the length of the thread P 1.5: Indicates the thread pitch, i.e. the distance between two threads - in this case 1.5 mm.

The Weldon 32 holder is a cylindrical shank with two flattened clamping surfaces arranged at 90°. These surfaces make it possible to securely fix the drill bit in the tool holder using grub screws attached to the side. The number 32 stands for the shank diameter in millimetres. A Weldon 32 shank has a cylindrical diameter of 31.75 mm (1-1/4"). The Weldon 32 holder is robust and reliable and therefore suitable for large drill diameters and high torques.

A tilt sensor on a FEIN magnetic core drilling machine (KBE 36 MAGSPEED, KBE 36 QM MAGSPEED, KBC 36 MAGFORCE, KBM 35 Series, KBM 50 AUTO, KBU 110-4 M) offers an important safety advantage: It immediately recognises if the machine tilts or slips during the drilling process and stops the motor automatically. This is particularly relevant as magnetic core drilling machines are often used on vertical or overhead surfaces. In such positions, insufficient magnetic holding force - due to dirt, scale or uneven surfaces, for example - can cause the machine to shift during drilling. Without a tilt sensor, this could lead to serious accidents, tool breakage or damage to the workpiece. By automatically switching off the motor in the event of tilting, the sensor not only protects the user, but also the machine and the drill itself. It therefore makes a significant contribution to work safety and the longevity of the tool.

The Morse taper (MK) is the shape of a tool taper for clamping tools in the tool holder of a machine. Advantages: Standardised tool holder, universal tool use, high concentricity and stability, use of the longest drilling tools. The following FEIN KBM / KBU models are equipped with an MK tool holder for the use of twist drills:

• MK2: AKBU 35 PMQW, KBU 35 MQW, AKBU 35 PMQ, KBU 35 MQ
• MK3: KBM 50 UQW, KBM 65 UQW, KBM 50 AUTO QW, KBM 50 U, KBM 65 U, KBM 50 AUTO
• MK4: KBU 110-4 M

HSS core drills are turned and ground from solid material. The drill body and cutting edges are therefore made from the same material. This makes the core drill extremely shock and impact resistant. The drill bit is durable in structural steel S235 and is ideal for assembly work and working at height. Carbide-tipped core drills are characterised by the high hardness of the cutting tooth. This enables excellent drilling results even in high-strength steel. A temperature resistance of 800°C also allows one or two dry holes to be drilled. With cutting speeds of up to 50 m/min, carbide-tipped core drills are clearly superior to HSS core drills with 25 m/min.

If the work takes place in confined and difficult to access situations, a KBC 36 compact machine with a fixed angular gearbox and fixed height should be used. If, on the other hand, you have free and easy access to the workpiece, we recommend using a KBM / KBU machine with a freely movable drill motor.

The most important core drill diameters for HM and HSS in steel and metal construction are between 16 - 32 mm. A machine with a maximum drilling capacity of 35 mm is sufficient for this. Larger drilling diameters are predominantly required for work in mechanical engineering, boiler/tank construction or shipbuilding.

If you only need the machine for core drilling, then a machine with clockwise rotation and a small stroke range (KBE) is sufficient. If, in addition to core drilling, you also want to carry out universal work, such as twist drilling, tapping, reaming and countersinking, then you need a machine with R/L rotation, speed adjustment and a large stroke range (KBM, KBU).

Material thicknesses up to 50 mm can be achieved with all FEIN core drilling machines (exception AKBC 36 MAGFORCE and KBC 36 MAGFORCE: only 35 mm). For material thicknesses > 50 mm, machines with an MK tool holder are required. A mounting shank available as an accessory enables cutting depths of up to 75 mm (with KBU 110 even up to 100 mm). If a cutting depth of 75 mm or 100 mm is still not sufficient, the MK tool holder also allows you to use commercially available twist drills with various cutting depths.

The use of an automatic machine (KBM 50 AUTO QW / KBM 50 AUTO) is recommended for serial core drilling work and large drilling volumes. This relieves the user, as he only has to carry out one control function. It also increases the service life of the core drills, as the feed force and feed speed are always optimised. For occasional work and manageable drilling volumes, a manual core drill is generally used.

The KBM 50 AUTO is equipped with a digitally controlled feed. This ensures a constant feed force of 1.1 kN. This enables predictable working times thanks to reproducible and synchronised drilling times.

A small, lightweight machine is required for work on site and at the construction site. If maximum mobility is also required, a cordless magnetic core drill is recommended. When working in the workshop, a somewhat larger and heavier magnetic core drill is generally used, as mobility and long transport distances are less important in the workshop.

HSS are suitable for soft to medium-hard metals such as mild steel and aluminium.

The recommended operating temperature is between +5 °C and +40 °C

Cooling is crucial for extending the service life of the core drill and improving the quality of the drill hole. Suitable coolants are drilling emulsions and high-performance cutting oils.

Always wear safety goggles, hearing protection and a chip guard when core drilling. Core drills should be changed while wearing gloves. If the magnetic holding force is lost, the machine must also be secured with a tension belt.

To ensure sufficient magnetic holding force and a secure stand of the machine, the minimum material thickness should be 12 mm for an electromagnet and 8 mm for a permanent magnet.

Recommended speeds for the HM ULTRA and HM ULTRA SPEED core drills depending on the drill diameter and the material to be machined.l. 

Recommended speeds for the HSS DURA core drill depending on the drill diameter and the material to be machined.

Recommended speeds for the HSS NOVA core drill depending on the drill diameter and the material to be machined.

To achieve optimum results, the surface on which the machine's magnetic base is placed must be level, clean and rust-free. We then recommend the following procedure: Mark the desired drilling point. Additional centre punching is recommended for small diameters. Place the machine on the workpiece. Push the centring pin through the core drill. With a tool-free QuickIN or Weldon quick-change system, pull the clamping sleeve of the tool holder downwards and insert the core drill. Release the clamping sleeve and turn the core drill until the locking mechanism engages. With a manual Weldon core drill holder, insert the core drill into the drill shaft and tighten the two hexagon socket screws. Position the machine at the marked drilling point and insert the mains plug into the socket. Now activate the electromagnet for a secure hold. In order to carry out the drilling process efficiently, make sure you select the correct gear level. The speed is set depending on the desired drilling diameter: Small diameters - high speed. Large diameters - low speed. Start the drilling process with the drill motor switch. Ensure the required coolant supply. The coolant is supplied directly to the drill tip by the integrated internal cooling lubrication. Control the feed rate using the machine's handwheel and drill at the required speed.

If the core drill gets stuck, the machine should be switched off immediately and the drill carefully withdrawn. Check the core bit for damage and ensure that the cooling is sufficient.

Switch off the machine immediately and carefully turn back the drill bit - using pliers if necessary. If the drill bit does not come out easily, flood the hole with lubricant and try again carefully. Important: Never pull with force, otherwise there is a risk of breakage!

There are different types of core drills, including HSS (high-speed steel), carbide-tipped and cobalt-alloyed core drills. HSS core drills are ideal for conventional steels, carbide-tipped core drills for harder materials and cobalt-alloyed core drills for high-strength steels.

Core drilling offers several advantages, including higher efficiency, lower heat generation, less wear on the drilling tools and the ability to drill larger diameters directly and precisely without pre-drilling.

Core drilling is an extremely economical drilling method: Faster, quieter and more precise than twist drilling. Without pre-drilling and retooling, it reduces your working time by up to 40 per cent. And you can significantly reduce the costs per hole compared to conventional methods. In contrast to twist drilling, core drilling only cuts a narrow ring rather than the entire drilling surface. This means that significantly less feed force is required. This protects the user as well as the core drill and the machine, as significantly less electrical power is required. After breaking through the material, the drill core is automatically ejected by the combined centring and ejector pin. Both overlapping holes, for example for slotted holes, and offset holes can be drilled.

Core drilling is a drilling process in which only the circumference of the drilled hole is machined, leaving a core in the centre. In contrast to conventional drilling, in which the entire material is removed, core drilling is more efficient and requires less feed force.

A blind hole thread is a threaded hole that does not drill completely through the workpiece and therefore has a certain depth. For blind holes, taps with twisted spiral flutes (type C) must be used. These guide the chip upwards out of the drill hole.

A through-hole thread is a threaded hole that drills completely through the workpiece and thus creates a passage into the workpiece. A tap with a peel cut (type B) is used for through holes. This guides the chip downwards out of the drill hole. However, there are also through-hole taps that guide the chip upwards.

Depending on the application and requirements, FEIN offers you core drills with different cutting qualities:

• FEIN carbide core drills are primarily used for continuous operation, such as serial drilling work. This is because their tool life is unrivalled when used properly.
• FEIN HSS core drills, on the other hand, are increasingly used for on-site assembly work. Especially when high impact and shock loads can occur. The FEIN carbide core drill ‘FEIN HM ULTRA’ / ‘FEIN HM ULTRA SPEED’ is ideal for use in industry, workshops and trades. Extremely long tool life is achieved through sufficient cooling and gentle drilling. The high-quality carbide tipping and special cutting geometry ensure maximum tool life and outstanding cutting performance.
• FEIN HM Ultra core drills offer you an enormously high degree of flexibility, as their material spectrum ranges from aluminium and mild steel to difficult-to-cut materials.
• FEIN core drills ‘FEIN HSS NOVA’ are made from a particularly high-quality HSS steel. This ensures a long service life and increased impact and shock resistance. This enables you to achieve excellent drilling results in steel and metal construction even under the most adverse conditions - and: outstanding efficiency!
• The FEIN core drill ‘FEIN HSS DURA’ is used when high impact and shock loads occur or when the use of coolant must be permanently dispensed with. In addition to high-quality HSS steel, a first-class titanium-nitride surface coating makes it highly resistant. It ensures the best sliding properties, increased heat resistance and outstanding tool life in aluminium, steel, stainless steel and grey cast iron.

The tensioning strap is pulled through a special opening between the magnet and the drill stand. This opening is specially designed for this purpose.

A blind hole is a hole that does not drill completely through the workpiece and therefore has a certain depth. The blind hole often serves as a pilot hole for a subsequent threaded hole. A blind hole is often required in metal and mechanical engineering, where large and heavy components are joined together. The connection is made using screws or pins, which enables easy installation at the destination later on.

Existing drill holes are enlarged in diameter by reaming. However, the required drilling power and feed force can also be reduced by reaming in stages. Reaming is carried out in all metal target groups. This may be necessary in new buildings or for remodelling work.

The standard core drills available on the market have a maximum cutting depth of 110 mm. However, there are applications and areas of use on the market that require a greater cutting depth. The need for large cutting depths exists in all metal target groups. In steel and metal construction for drilling through square and beam profiles. In mechanical engineering for drilling through solid steel plates, e.g. in the manufacture of pressing units.

Electric tapping is many times more precise than manual tapping and is faster and effortless. Core drilling machines from the KBU / KBM series with clockwise / anti-clockwise rotation and electronic speed adjustment enable direct and precise tapping. The large stroke range of the machines makes it possible to change tools without having to remove the machine from the workpiece. FEIN offers an extensive range of accessories for tapping: Quick-change tapping chuck, insert for through-hole threads to DIN 371, 374/376, insert for blind-hole threads to DIN 371, 374/376, suitable taps from M6 - M12.

Carbide-tipped core drills are suitable for hard and abrasive metals such as high-alloy steel, difficult-to-machine metals, stainless steel, cast iron and non-ferrous metals.

Core drills can machine a wide range of materials, including conventional steels, stainless steel, aluminium, copper and brass.

The HSS NOVA core drill is considered to be particularly economical to use as it offers an excellent ratio of cost, performance and service life - especially for medium requirements. It is significantly cheaper to purchase than carbide core drills, making it an attractive choice for many workshops and assembly applications. Another advantage is its reusability: HSS core drills can be re-sharpened several times, which considerably extends their service life and significantly reduces the cost per hole. The HSS NOVA is ideal for softer to medium-strength materials such as mild steel, aluminium or non-ferrous metals and impresses with its reliable performance.

The appropriate centring pin must be selected depending on the cutting depth and overall length of the core drill.

• Cutting depth 25 mm -> 82 mm long centring pin
• Cutting depth 35 mm -> 100 mm long centring pin
• Cutting depth 50 mm -> 100 mm long centring pin
• Cutting depth 75 mm -> 125 mm long centring pin
• Cutting depth 100 mm -> 158 mm long centring pin

The FEIN TCT ULTRA core drill impresses with its exceptional durability, impressively high cutting performance and its versatility when used in a wide range of materials - even extremely hard metals. It is specially designed for demanding everyday workshop use and is ideal for serial drilling work and continuous use under the toughest conditions. Thanks to its robust design and precise workmanship, it is the ideal choice for professional applications. The drill bit is available with either a 3/4" Weldon or QuickIN chuck, making it compatible with a wide range of machines.

The manual KBE 36 MAGSPEED / KBE 36 QW MAGSPEED impress with their unique durability for up to 240,000 drill holes thanks to an extremely low-wear machine concept. A maximum load speed of 620 rpm halves previous drilling times and allows up to 60 core drillings per hour. The KBM 50 AUTO QW / KBM 50 AUTO is a fully automatic core drilling machine. The user only has a control function and does not actively intervene in the core drilling process. This minimises physical strain.

• Core drills in the 12 - 65 mm diameter range usually have an inner bore of 6.4 mm. Centre pins with a diameter of 6.35 mm are used here.
• Core drills in the diameter range of (50 mm) 65 - 110 mm usually have an inner bore of 8 mm. Centre pins with a diameter of 7.98 mm are used here.

KBM stands for core drilling machine metal. KBM was the official name of the universal FEIN core drilling machines until 2014.

FEIN attaches great importance to occupational safety. Many machines are equipped with a sensor that measures the magnetic holding force and then communicates this visually to the user. If the machine starts to slip or tip over, an integrated motion sensor stops the drill motor immediately. The KBU / KBM models have the control panel on the top of the drill motor. This means that it is always in view and can be reached quickly in an emergency.

A magnetic core drilling machine must also be secured with a tension belt, because under certain conditions the magnetic force alone is not sufficient to hold the machine securely on the workpiece. Here are the most important reasons:

1. safety in case of insufficient magnetic force - The magnetic force depends heavily on the material thickness, surface condition and cleanliness of the workpiece.

• The adhesive force can be significantly reduced on painted, rusted or uneven surfaces.
• A tension belt prevents the machine from coming loose and falling in the event of a sudden loss of force or power failure.

2. protection in the event of a power failure - Most magnetic core drilling machines use electromagnets, which immediately lose their holding force in the event of a power failure.

• The tensioning strap acts as a mechanical safety device to prevent slipping or tipping over

3. working on vertical or overhead surfaces - When drilling on vertical walls or overhead, there is a particularly high risk of the machine coming loose.

• The tensioning strap additionally holds the machine in position and protects the operator from injury.

4. health and safety regulations - In many companies, additional securing with a tensioning strap is mandatory in order to comply with health and safety regulations.

The centring pin fulfils three tasks.

1. positioning: It enables precise alignment at the desired (centre-punched) drilling point.

2. cooling: It closes and opens the coolant channel on the core drill and ensures that coolant is fed downwards to the cutting teeth via a cooling channel.

3. core ejection: The centring pin runs against a spring in the shank of the core drill. This is compressed and pushes the centring pin downwards when the core drill breaks through the material. This ejects the drill core from the core drill.

The magnetic holding force indicator on FEIN magnetic core drills offers a decisive advantage for safety and precision when drilling. It shows the user in real time whether the magnetic base of the machine has sufficient grip on the workpiece surface. This is particularly important, as insufficient holding force can cause the machine to shift during the drilling process - with potentially serious consequences such as cutting edge breakage or the drill bit breaking off at the shank. The visual feedback from the display allows the operator to immediately recognise whether the machine is positioned correctly and is holding securely. This not only increases work safety, but also protects the tool and workpiece from damage. This function is particularly useful when working on painted, coated or slightly scaled surfaces, where the magnetic force may be impaired. In addition, the magnetic holding force indicator enables more efficient work, as there is no uncertainty when positioning the machine. The user does not have to rely on instinct, but can rely on a clear, objective display - a great advantage, especially when working overhead or in hard-to-reach areas.