Silverline 612120 Lip and Spur Drill Bits 3 mm Pack of 10

Product Information

When drilling with a hand-held drill the flexibility of the bit is not the primary source of inaccuracy—it is the user's hands. Therefore, for such operations, a center punch is often used to spot the hole center prior to drilling a pilot hole. Point: Once the spurs are complete, then focus on the point. You’ll need to focus on the edges of the point to ensure it becomes sharp again. Each side should be set at a five to ten-degree angle. Plus, the same number of passes should be used for each side as well. This article needs additional citations for verification. Please help improve this article by adding citations to reliable sources. Unsourced material may be challenged and removed. Some of the twist bits feature HSS (high-speed steel), which can drill through many materials and it is capable of withstanding high temperatures.

Another thing about these units is that most of them are made out of alloy steel, and when you compare them with HSS units, you’ll notice several differences. These include a steeper twist and deeper flute, ensuring that they deliver pretty clean holes. Uses of Lip and Spur Drill Bits This flexible installer bit is used in the US, but does not appear to be routinely available in Europe. It has edges at the front to cut the materials, while the spiral design gets rid of debris that may come out of your work. You can use these bits for timber, plastic, certain types of metals and other materials. The cutting principles of the auger bit are the same as those of the center bit above. The auger adds a long deep spiral flute for effective chip removal. Titanium aluminum nitride (TiAlN) is a similar coating that can extend tool life five or more times.There are some considerations to keep in mind. For instance, while drilling glass, it is better to use a lubricant, like turpentine. It is the best method to keep the tip at a normal temperature. Most modern solid-carbide bits should not be used in conjunction with a spot drill bit or a center drill bit, as solid-carbide bits are specifically designed to start their own hole. Usually, spot drilling will cause premature failure of the solid-carbide bit and a certain loss of hole quality. If it is deemed necessary to chamfer a hole with a spot or center drill bit when a solid-carbide drill bit is used, it is best practice to do so after the hole is drilled. [ citation needed] Titanium nitride (TiN) is a very hard metallic material that can be used to coat a high-speed steel bit (usually a twist bit), extending the cutting life by three or more times. Even after sharpening, the leading edge of coating still provides improved cutting and lifetime. While the twist bits come at different size ranges, from 0.8 to 12mm, they work better for holes of a small size. Also, when you use it on green wood, it might clog, which is why you must stop and get the waste out regularly.

Best Drill Bits For Plastic A spur or Brad point drill bit, ideal for drilling plastic. Photo by Emrys2 licensed under CC BY-SA 3.0. Put your goggles on before starting. Your goal is to remove the minimum amount of surface metal while making your bits as sharp as possible. Take note of the angles and the lips and ensure that the few seconds of grinding do not wear out your cutting edges. Otherwise, you need some knowledge on how to hold the drill bit against each sharpener. Materials that Make the Best Brad Point Drill Bit Set Coming to metal bits, you will notice an angle at the tip, and they are mainly made from HSS material. Then, you will find golden or coppery colors as the dominant ones in the market.

If you’re just looking to punch some holes in a plastic lid, then going for a single 3/16″ drill bit will do you fine.