Drill presses can significantly enhance your drilling accuracy, especially when working with hardened steel. The stability and precision of this drill are crucial for ensuring that your drill bits do not wander or break, resulting in cleaner and more accurate holes.

Drilling through metal is a lot harder than drilling through wood. It requires a tougher drill bit and hardened steel requires special attention and tools. To help, here are some tips on the best drill bits for hardened steel. From DIY enthusiasts to professional craftsmen, everyone needs the right drill bits to make the job easier, faster, and more efficient.

Not only do they maintain their sharpness longer than their counterparts, but they also offer precision that is unmatched, making them a top choice for professionals [source: Tool Shop Parweld].

Let’s now move on to G, the last letter of the alphanumeric code; it indicates that our insert has a chip-breaking geometry on the face of the cutting edge, suitable for controlling and breaking the chips that will be formed during machining. Obviously, the geometry is studied and carried out on both faces of the insert. Moreover it has some characteristics in relation to the material to be machined and the operation to be carried out, i.e. finishing or roughing of a component.

The second letter determines the value of the insert clearance angle. N for the ISO is an angle of 0 degrees so our insert can be a double-sided insert, so it can be used on both sides. It should also be noted at this point that the fixing of the insert on the tool is of the lever type and therefore a strong fixing.

Good morning, in today’s additional info I would like to give you some examples of ISO nomenclature in order to help you become familiar with the names of the inserts but above all with the coding itself. It is very important for anyone working in machining to know and understand the insert and its ISO nomenclature. In the lesson we saw three examples of ISO nomenclature when we asked Paolo the question; we saw an RNMG, a WNMG and a WCGT. Apart from the first letter which distinguishes the form, the first two inserts have identical parameters 2, 3 and 4 and exactly _NMG. This is also the most common ISO nomenclature for double-sided tools with chipbreaker geometry; these, as we shall see in the lesson on side rake angles, are fitted to negative tools. While the third case of the exercise posed to Paolo has parameters 2, 3 and 4 equal, _CGT. The latter is the most common ISO nomenclature for single-sided inserts. Let’s look at a new case very similar to the one seen in the lesson. TNMG 160404 PF So let’s go in order and start with the letter T. Insert shape As we said in the lesson, the first letter identifies the shape of the insert; in this case is triangular with an angle between the cutting edges of 60 degrees. Side rake angle The second letter determines the value of the insert clearance angle. N for the ISO is an angle of 0 degrees so our insert can be a double-sided insert, so it can be used on both sides. It should also be noted at this point that the fixing of the insert on the tool is of the lever type and therefore a strong fixing. Tolerance Then we come to the third letter M. M establishes the tolerance class that is given with respect to the circle inscribed in the geometric figure of the insert. In this case is a circle with a diameter of 9.525. This value, the diameter of the inscribed circle, is taken from the insert size table, which we will see with parameter 5 relating to the size. Class M is a tolerance that is not very precise but nevertheless one of the most widely used in turning and which corresponds exactly to ±0.05 mm. Insert type Let’s now move on to G, the last letter of the alphanumeric code; it indicates that our insert has a chip-breaking geometry on the face of the cutting edge, suitable for controlling and breaking the chips that will be formed during machining. Obviously, the geometry is studied and carried out on both faces of the insert. Moreover it has some characteristics in relation to the material to be machined and the operation to be carried out, i.e. finishing or roughing of a component. After the letters we now move on to the numbers, which as we have seen are taken in pairs. Size The first pair equals to 16 mm: this is the length of the insert side. With the triangular shape there are also other lengths, for example 11 or 22mm. The side dimension is 16 mm, which corresponds to an inscribed circle of 9.525 mm. This number was used to calculate the numerical value of tolerance M. Thickness The length of the cutting edge will influence the removal capacity of the insert depending on the thickness. This thickness is determined by the second pair of numbers, which we see here as 04. This pair indicates a thickness of 4.76 mm from the inch-millimetre conversion. Other cutting edge lengths will have different thicknesses. Please note that thickness is very important as it constitutes the resistant section of the cutting edge. The greater the thickness, the greater the strength of our insert. Sometimes, in order to increase the life of the cutting edge with the same chip volume, i.e. with the same working data, it is sufficient to oversize the length of the cutting edge. This will provide a higher thickness, which will guarantee high resistance to the cutting forces and temperatures that will develop during turning. Nose radius The third and last pair of numbers in this part is 04, which in tenths of a millimetre is the value of the nose radius. The nose radius influences the strength of the cutting edge. In fact, a radius such as in this case 0.4 mm cannot be used for heavy roughing operations where, on the contrary, a larger radius will be useful, for example 1.2 mm. Therefore, this value of 0.4 mm also means that the field of application for this insert will be finishing or other light operations. The last parameter to be considered is the pair of letters which in this case is PF. The field n°12 is left empty by the ISO standard for the insert builder who uses it to indicate the geometry of the chipbreaker drawn on the insert face. This geometry is fundamental for a correct use of the insert. In fact, each geometry has been designed and studied to control chip formation in precise applications. These applications vary in terms of material groups and type of machining: finishing, medium removal or roughing. In our case we have used the letters PF as an example, where P identifies the family of steels while F indicates the finishing operation. So in this case the chipbreaker geometry is suitable for finishing operations on steels. To conclude, we can say that knowing the insert nomenclature you will have identified every dimensional and constructional aspect of your insert. Only the geometry of the chip breaker will be excluded from ISO, since it is not included in the standard and is defined differently from builder to builder. TPGN 110308 This second example of an insert is not very common, but it is shown here for educational purposes. It is a turning and finishing insert that is assembled on boring bars for internal machining or on adjustable boring cartridges. The insert has a flat face and its fixing system is of the micro-fused bracket type. T = triangular-shaped insert P = 11 degree insert clearance angle G = tolerance class in this case of accuracy N = insert with a flat face without chipbreaker geometry 11 in millimetres is the length of the side of the insert 03 indicates the thickness S of the product, here set at 3.17 millimetres 08 in tenths of a millimetre is the value of the nose radius which in this case is 0.8mm   SOEX 120508 Again, this is an uncommon insert but ideal for understanding the ISO nomenclature. It is a screw-clamp type insert with a countersunk slot, used in finishing or semi-finishing operations on internal machining tools such as boring bars. Sometimes for some builders it is also used in drilling on mechanically clamped drills. S = square-shaped insert O = 8 degree insert clearance angle E = tolerance class on inscribed circle. Precision insert (inscribed circle equal to mm 12,70) X = special non ISO standard (this letter only) with chipbreaker geometry 12 = in mm insert side length mm 12 05 = thickness value, in this case is 5.16mm 08 = in tenths of a millimetre the value of the nose radius, in this case 0.8mm   CHOICE OF NOSE RADIUS Now that we have seen some examples of coding that have been more or less used, let’s say a few words about the choice of the insert nose radius. The nose radius influences a very important cutting data, the feed rate. We will dedicate a specific lesson to the feed rate, but for the moment let’s say that it identifies the speed at which the tool carries out its removal path.   To be precise in turning operations, it is measured in mm per revolution, i.e. the distance covered by the tip of the insert at each turn of the workpiece. The values, as we shall see, range from a few hundredths of a millimetre to a few millimetres in the rarest cases. A small nose radius implies small feeds; large nose radius allows large feeds to be used. When choosing the radius of the point we must take into account various aspects which I will list below: In finishing operations the nose radius influences the internal corner radius that will remain on the workpiece profile. So it is usually the design or construction guidelines of the workpiece that define the maximum insert corner radius. Usually the most commonly used radius that takes this into account is 0.4mm. Obviously, if your workpiece has no internal corner  radius or the value of the internal radius left on the workpiece is irrelevant, the choice of insert radius will be made on the basis of the following considerations; Larger nose radius, stronger inserts; With large nose radius, high feed rates are possible (more on this in the feed rate lesson); Adopting large nose radius (all other cutting parameters being equal) will develop more radial forces, which are one of the primary sources of vibration. This last aspect is the one that puts a limit on the maximum nose radius that can be used. We will return to this subject in future lessons.

ANSIinsertnomenclature

These spot welds need to be removed to repair or replace the panel and spot weld drill bits are used in this application.

Heat is a major enemy when drilling hardened steel. It's important to keep your drill bits cool to prevent them from losing their temper and becoming dull. Using a cooling agent or lubricant, like cutting oil, can significantly increase the lifespan of your drill bits [source: Thyssenkrupp].

To be precise in turning operations, it is measured in mm per revolution, i.e. the distance covered by the tip of the insert at each turn of the workpiece. The values, as we shall see, range from a few hundredths of a millimetre to a few millimetres in the rarest cases. A small nose radius implies small feeds; large nose radius allows large feeds to be used.

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Again, this is an uncommon insert but ideal for understanding the ISO nomenclature. It is a screw-clamp type insert with a countersunk slot, used in finishing or semi-finishing operations on internal machining tools such as boring bars. Sometimes for some builders it is also used in drilling on mechanically clamped drills.

The nose radius influences a very important cutting data, the feed rate. We will dedicate a specific lesson to the feed rate, but for the moment let’s say that it identifies the speed at which the tool carries out its removal path.

ISO turninginsertnomenclature

Unlike softer materials, it requires specific drill bits that can penetrate without losing their edge or causing damage to the material or the tool.

Millinginsertspecification

Another excellent choice for drilling hardened steel or to drill holes in general is cobalt drill bits. These bits, made with a significant percentage of cobalt, are incredibly resilient and effective at maintaining their sharpness.

Now that we have seen some examples of coding that have been more or less used, let’s say a few words about the choice of the insert nose radius.

This second example of an insert is not very common, but it is shown here for educational purposes. It is a turning and finishing insert that is assembled on boring bars for internal machining or on adjustable boring cartridges. The insert has a flat face and its fixing system is of the micro-fused bracket type.

Then we come to the third letter M. M establishes the tolerance class that is given with respect to the circle inscribed in the geometric figure of the insert. In this case is a circle with a diameter of 9.525. This value, the diameter of the inscribed circle, is taken from the insert size table, which we will see with parameter 5 relating to the size. Class M is a tolerance that is not very precise but nevertheless one of the most widely used in turning and which corresponds exactly to ±0.05 mm.

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As we said in the lesson, the first letter identifies the shape of the insert; in this case is triangular with an angle between the cutting edges of 60 degrees.

The last parameter to be considered is the pair of letters which in this case is PF. The field n°12 is left empty by the ISO standard for the insert builder who uses it to indicate the geometry of the chipbreaker drawn on the insert face. This geometry is fundamental for a correct use of the insert.

In fact, each geometry has been designed and studied to control chip formation in precise applications. These applications vary in terms of material groups and type of machining: finishing, medium removal or roughing. In our case we have used the letters PF as an example, where P identifies the family of steels while F indicates the finishing operation. So in this case the chipbreaker geometry is suitable for finishing operations on steels.

Carbideinsertidentification chart PDF

When it comes to drilling hardened steel, carbide drill bits are the champions. The carbide drill bit has exceptional hardness and resistance to high temperatures make them ideal for this task.

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When drilling hardened steel, the right combination of speed and pressure is vital. Using a slow speed and applying steady pressure allows the drill bit to cut through the steel effectively without overheating or wearing out quickly [source: Chicago Pneumatic].

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Cut taps are much more lenient on hole size, and as such, easier for someone to make passable threads. Upvote

Unlike high speed steel bits, they are particularly useful when drilling through hardened metal, offering durability and efficiency [source: rdbarrett.co.uk].

Regular maintenance, including sharpening your drill bits, is essential for effective drilling. A well-sharpened drill bit can make a significant difference in how easily and cleanly it cuts through hardened steel.

TurninginsertIdentification chart

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ISOinsertnomenclature pdf

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The length of the cutting edge will influence the removal capacity of the insert depending on the thickness. This thickness is determined by the second pair of numbers, which we see here as 04. This pair indicates a thickness of 4.76 mm from the inch-millimetre conversion. Other cutting edge lengths will have different thicknesses.

Please note that thickness is very important as it constitutes the resistant section of the cutting edge. The greater the thickness, the greater the strength of our insert. Sometimes, in order to increase the life of the cutting edge with the same chip volume, i.e. with the same working data, it is sufficient to oversize the length of the cutting edge. This will provide a higher thickness, which will guarantee high resistance to the cutting forces and temperatures that will develop during turning.

ISOinsertgrade chart

The first pair equals to 16 mm: this is the length of the insert side. With the triangular shape there are also other lengths, for example 11 or 22mm. The side dimension is 16 mm, which corresponds to an inscribed circle of 9.525 mm. This number was used to calculate the numerical value of tolerance M.

Good morning, in today’s additional info I would like to give you some examples of ISO nomenclature in order to help you become familiar with the names of the inserts but above all with the coding itself. It is very important for anyone working in machining to know and understand the insert and its ISO nomenclature.

Drilling hardened steel doesn't have to be a daunting task. With the right tools and techniques, you can easily tackle this challenging material. Remember, choosing the right drill bits, such as carbide or cobalt ones, using a drill press for stability, and maintaining your tools will make a significant difference. Stay safe, and happy drilling!

Carbide tipped drills are an excellent investment for those who frequently drill hardened steel. These drills have a carbide tip attached to a softer steel body, offering a combination of toughness and flexibility that is ideal for handling hardened steel's demands [source: Tool Shop Parweld].

In the lesson we saw three examples of ISO nomenclature when we asked Paolo the question; we saw an RNMG, a WNMG and a WCGT. Apart from the first letter which distinguishes the form, the first two inserts have identical parameters 2, 3 and 4 and exactly _NMG. This is also the most common ISO nomenclature for double-sided tools with chipbreaker geometry; these, as we shall see in the lesson on side rake angles, are fitted to negative tools. While the third case of the exercise posed to Paolo has parameters 2, 3 and 4 equal, _CGT. The latter is the most common ISO nomenclature for single-sided inserts.

Insert designationchart

Drilling hardened steel is a task that demands not only skill but also the right tools. Hardened steel, known for its high durability and resistance to wear and tear, poses a unique challenge.

To conclude, we can say that knowing the insert nomenclature you will have identified every dimensional and constructional aspect of your insert. Only the geometry of the chip breaker will be excluded from ISO, since it is not included in the standard and is defined differently from builder to builder.

When drilling hardened steel, safety should always be a priority. Wearing protective gear and ensuring your equipment is in good condition can prevent accidents and ensure a smooth drilling experience.

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The third and last pair of numbers in this part is 04, which in tenths of a millimetre is the value of the nose radius. The nose radius influences the strength of the cutting edge. In fact, a radius such as in this case 0.4 mm cannot be used for heavy roughing operations where, on the contrary, a larger radius will be useful, for example 1.2 mm. Therefore, this value of 0.4 mm also means that the field of application for this insert will be finishing or other light operations.

The angle of the drill bit is crucial when drilling through hardened steel. A bit with a 135-degree angle is often recommended as it offers a good balance between sharpness and strength, making it ideal for penetrating tough materials [source: Regal Cutting Tools].