21drillsize in fraction

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Standarddrill bitsizes in mm

The correct PPE is of paramount importance when drilling; chips and swarf are sharp and travel at speed so make sure your eyes are well protected. If you wear prescription glasses make sure you wear additional goggles designed to wear over the top as regular glasses will not provide adequate protection. Gloves are not recommended when drilling as they pose a risk to becoming entangled in the drill; the extreme forces, rotation, and speed encountered when drilling can easily break a finger or wrist. Ear defenders are recommended to protect your hearing, exposure to loud machining noise can permanently damage your hearing and contribute to developing tinnitus. You can browse our full range of PPE products here.

Lip relief angle. The lip relief angle refers to the angle at the outer corner of the lip and is responsible for supporting the cutting edge in contact with the metal. This lip relief angle is determined by the angle of the point; a smaller point angle means more web is presented to the workpiece, so the bit would need a bigger lip angle to support the cutting edge. The size of the lip angle increases as the drill diameter decreases. If the drill tip does not have an adequate lip relief angle then the cut will be poor, even if the bit is sharp, and will ultimately result in excessive wear and binding during operation.

Step drilling technique entails the first drilling depth to not exceed 3-4 times the diameter of the bit, then withdraw the drill, the second drilling cycle depth should be no more than an additional 2 times the diameter of the bit then withdraw the drill; subsequent cycles can add 1 more depth equal to the diameter of the bit.

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Helix angle. The helix angle refers to the angle of the flutes to the face of the metal being drilled. The correct helix angle is important to ensure swarf moves from the excavated hole cleanly as the greater the helix angle, the smaller the capacity of the flute zone.

.024 drill bitequivalent

Point angle. This refers to the angle of the point at the very tip of the bit. Hard metals, such as stainless steel, require a wider point angle than a bit used on less hard metals; selecting the correct size point angle will reduce wear and travel, result in a better hole shape, and reduce machine chatter.

.024 drill bitsize

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Frequent backing out with the drill bit and minimising dwell will help to reduce hole wall roughness and drill breakage.

32drill bitsize in inches

Begin by clearing your workspace to ensure there is nothing that may catch in the drill when you start working. Make sure you have everything to hand so you can concentrate on getting the job done without interruption. This is a good time to set up your drill and ensure all cables are in good condition.

Equipment you will need; suitable drill bit, cutting fluid, eye protection, ear defenders, heavy duty tape, marker pen or 3 corner pyramid punch, sturdy clamp, and felt or plastic to protect workpiece in the clamp.

7drill bitsize in fraction

29drill bitsize in Fraction

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21drill bitsize in inches

There are many different types of drill bit and reamers suitable for drilling stainless steel. Choosing the correct type for a particular project is paramount to achieving the best results.

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Step drilling is often recommended for thicker profiles of stainless steel to help keep swarf clear, allow for good penetration of coolant into the hole and to reduce friction at the drill point. The full feed and speed rates must be maintained when backing out and re-entering to ensure smooth transitioning through the layer of work hardened steel that will develop as the cutting is underway.

Web thickness. The web thickness should preferably be a minimum of 1/8 of the drill diameter. The web is the central shaft of the bit that the flutes project from. The web supports the drill as it penetrates the metal being drilled, if this is too thin the bit may snap.

Once the choice of material has been decided on it is important to consider the right size bit for the project. Paying attention to the geometry of the bit will greatly improve the quality of the finished hole and make the whole process much easier.

These steps should have you drilling through stainless steel like a professional in no time, however, below is more information to give you a much deeper knowledge of ways to drill stainless steel to get the very best results every time.

Stainless Steel will work harden relatively quickly, especially with the heat generated by drilling intensifying the process. Once Stainless steel becomes work hardened it becomes incredibly difficult to drill; the surface will glaze which will cause the bit to deviate and bounce resulting in blunting of the drill bit, surface damage, or even snapping the bit.

When drilling deep holes with a depth more than 3 times the bit diameter, the speed and feed rates need to be reduced to lessen work hardening, ensure swarf keeps clear, and reduce the possibility of bit breakage.

Length. The length of the bit governs how deep the hole can be drilled, however, the longer the bit is, the more flex it will have. If the bit flexes, the hole may be inaccurate and not on the correct axis. By selecting a bit of suitable length, the likelihood of deflection and breakage during operation will be reduced. Bits are available in a variety of lengths, the most popular length for the majority of metal drilling operations are referred to as ‘jobber’. The length of the flutes on these bits are between 9 and 14 times the diameter. These are considered a good all-rounder for most projects.

Whether you are an experienced fabricator or an avid hobbyist, you should now be well equipped to tackle any stainless-steel drilling job that comes your way.