Since stainless steel is a very hard material, you have to choose the right twist drill. The twist drill should belong to the application group Type H of the DIN 1386 division. Over time, however, mixed forms have been developed whose naming systems are not standardized in the DIN manual. So you will find at RUKO for the use in stainless steel the types VA, FO, UTL3000, UNI, TL3000, N and UTL.

You should not have used the twist drill on other steels before. The metal particles on the twist drill can attack the stainless steel and make it susceptible to corrosion.

Alu Power HPC is the ultimate milling cutter for aluminium metal removal. YG-1’s flagship non-ferrous range offers speed, strength and sharpness, with effective chip evacuation at high feed rates with lower cutting forces. From side cuts to rough cuts to aggressive ramping, no cutter withstands extreme radial forces better – or longer. Its 37° helix design can operate at lower speeds with higher efficiency.

What features does the twist drill have to have in order to cut stainless steel? The following criteria must be met in order to obtain a good drilling result.

You have chosen a suitable twist drill and now you finally want to drill your hole in stainless steel. When drilling, it is important that you

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See the table below for information on the speed and feed settings and the type of cooling. You can download the speed table as a PDF file. Click on the image.

If you want to use a coating, e.g. to increase the tool life, it should be at least the TiAlN coating, because it has a high heat resistance. With TiAlN-coated drills, cooling is not necessarily required. In addition, they prevent cold welding on the drill.

With cooling you ensure that the surface quality is optimal, the temperature is lowered and the chips are swept away. This extends the life of the drill

A tool steel that is too soft would immediately overheat. So since stainless steel is a hard material, you need a twist drill type H. In the course of time, the features of twist drills have been combined differently in order to optimize them for special applications. Thus, mixtures have formed whose naming system is not standardized in the DIN manual. So you will find at RUKO for use in stainless steel types VA, FO, UTL3000, UNI, TL3000, N and UTL.

Although previously it was stated that aluminium milling cutters should be uncoated, the HPC range bucks this trend by featuring an optional DLC (diamond like carbon) coating. This coating is designed for hard or abrasive aluminium substrates such as aluminium used in aerospace and high silicone aluminium alloys.

The spiral angle determines the process of chip formation. Small spiral angles are used for hard short-chipping materials.

You should not wear gloves, because they can get caught in the twist drill. In contrast to the gloves, you should unconditionally put on protective goggles.

Modern milling cutters (HSS, Powder Metal or Carbide) for ferrous metals usually feature some type of coating, like TiN or TiAlN, to improve tool life or increase its performance. However, on aluminium (which is non-ferrous) and other soft materials like copper and plastics, a coating will elevate the risk because the material will stick to this coating. Therefore, we would recommend that when machining aluminium an uncoated milling cutter should be used, unless the coating is specifically designed for non-ferrous materials, like a DLC (diamond-like carbon) coating.

For non-hard aluminium we would recommend the uncoated HPC range, which includes a range of 3 flute slot drills, with features like an extended neck and corner radius increasing the application range and tool life. Furthermore, these cutters are highly effective in vertical ramping up to 20° and step-over plunging applications.

Under certain conditions (e.g. type of stainless steel, point angle, spiral angle etc.) you can also use a TiAlN-coated HSS drill. There are some stainless steels that are easy to cut and can also be drilled with coated HSS drills.

If you have found the right twist drill and follow these instructions, you will get a good drilling result in stainless steel.

You want to drill a hole in stainless steel but don't know which twist drill to use? In this article we explain how to drill in stainless steel and which twist drills to use.

Deep flute pockets mean that the cutter doesn’t clog as quickly, so the tool can be run for longer and at higher cutting data. Lapped and polished flutes enable excellent chip flow when machining soft materials, whilst a sharp cutting edge gives quicker metal removal rates.

In terms of variation, Alu Power is the most comprehensive range we supply. It encompasses a huge range of lengths, styles and geometry types. Both slot drills and end mills are available, with long length variants give superior chip evacuation in deeper applications. Ripper style cutters enable faster and more extreme metal removal rates.

Optimizing your feedrate is all about maximizing how much material you're cutting per unit of time, the faster the better in general. Hence, getting your feeds ...

The Alu Power range is not just designed for aluminium (as the name may suggest), but also encompasses copper, brass and plastic. YG-1 have also created a range of cutters specifically for machining plastics called Plastic-Cut.

The break sensitivity in comparison to HSS is higher in HSSE-Co or carbide tool steels. Basically you can negate this with the correct application (correct speed, feed and cooling). In general, the more cobalt, the harder and therefore more brittle the drill.

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Most aluminium milling cutters will feature the above attributes. However, which range you choose will depend on various factors like:

To complement our Alu Power range, Korloy’s A+ End Mills are our first choice high performance cutter for aluminium finishing applications. These 2 or 3 flute cutters feature a 50° helix angle and u-shaped flutes to provide an extreme quality surface finish. Its cutting edge features high rigidity to ensure high productivity. A+ End Mills are the best way to get a mirror surface finish using a standard carbide aluminium milling cutter.

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Stainless steel is a very hard material and therefore difficult to cut. Therefore, the tool steel of the twist drill should be made of HSSE-Co 5 (5% cobalt content), HSSE-Co 8 (8% cobalt content) or solid carbide.

In our detailed article "8 features of a twist drill and its functions" you will learn all the important features of twist drills and which functions they have when drilling.

For any advice or more information on our range of aluminium milling cutters please get in touch today by calling 01924 869610, email sales@cutwel.net or view our full range online at www.cutwel.co.uk.

Aluminium can be an easy to machine material because it is much softer than the likes of hardened steel and tough super alloys like inconel. To make life easier and maximise your machining capabilities, you will need to use the correct geometry tooling, high precision collets and suitable tool holders.

Our most popular range, YG-1’s Alu Power is the perfect all-round carbide milling cutter designed specifically for non-ferrous materials like aluminium. Its micrograin carbide substrate ensures increased performance, tool life and wear resistance over the HSS range in stable machining conditions. Meanwhile, the special geometry for aluminium ensures the best chip control and surface finish.

Stainless steel is a metallic material which is characterized by its special purity . There are alloyed and unalloyed steel, but only the alloyed variant is also stainless.

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If you are drilling through steel you want the the best metal drill bit chances are you will buy a cobalt drill bit. Cobalt drill bits are the best drill bits ...

If possible, use a pillar drilling machine as it allows you to better control the centering, speed and feed . High feed rate is required and your speed is rather low when drilling.

In the application table you will find all our twist drills with which you can drill in stainless steel. If you click on the images of the twist drills in the PDF, you will be taken directly to the product page where you can find detailed information about the twist drill.

In stainless steel, it must be enriched with alloying elements such as titanium, niobium or chromium in addition to iron. Chromium (Cr) is the corrosion resistance of stainless steel and should have a minimum content of 12% and an extremely low carbon content. The chromium content creates a layer on the material surface which permanently protects against water and moisture.

Our range of Alu-Cut HSS milling cutters include 2 or 3 flute variants in either a standard or rougher profile. It features deep flute pockets for improved performance in soft material machining. Rippers also have a chamfer preparation on the tool edge to protect the tool on first contact, hence improving the tool life.

The twist drills made of HSSE-Co 5, HSSE-Co 8 or solid carbide do not neccesarily need coating . Coated drills are still ideally suited for industrial use. I.e. fast speeds (high cutting speeds), high feed rates and increased heat applications.

In each of our product groups you will find a Product finder. Under Products > Twist drills you can filter "stainless steel" in the field Applications. You will then be shown all twist drills that can be used for cutting stainless steel.

If you do not have a pillar drill available, use the pointed side of the punch and a hammer to make a small recess in your stainless steel workpiece. This gives you better guidance and prevents slippage when drilling. The center punching compresses the material a bit, but mainly the material is displaced to the side and over the top of the material. This does not pose any extreme challenges for the twist drill.

Cutwel supply a range of aluminium milling cutters to suit all budgets and applications. Below is a summary of each range and what situations each cutter is best suited for.

Its composition means aluminium is a soft and sticky material with a low melting point. What this means is that, when machining, there is often a build up of swarf as the material ‘gums up’ the tool on its cutting edge. This is commonly called a built-up edge and in turn, this can severely limit the effectiveness of the tool with potentially a poorer surface finish and a reduction in speeds and feeds.

With cooling you ensure that the surface quality is optimal, the temperature is lowered and the chips are swept away. This extends the life of the drill

With a large point angle, more of the cutting edge engages in the workpiece when drilling. This also means that more force is applied to the workpiece and higher contact pressure (high feed) is required.

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Starting with our lowest cost option, the Alu-Cut range from YG-1 are made from a tough HSS substrate, and it best suited for use on manual machines or where machining set-ups are unstable. This is because HSS is more forgiving over a carbide substrate and is less likely to chip should there be any vibrations present in the machining process, or if the component isn’t held rigidly.

The point angle is located at the head of the twist drill. For hard materials such as stainless steel, the point angle should be large and e.g. 130° or 135°. For soft materials, point angles of e.g. 118° are used.

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There are some other features typical of aluminium milling cutters which help to avoid the problem of material build-up including:

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