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

Product Information

The diameter of auger bits for hand braces is commonly expressed by a single number, indicating the size in 16ths of an inch. For example, #4 is 4/16 or 1/4in (6mm), #6 is 6/16 or 3/8in (9mm), #9 is 9/16in (14mm), and #16 is 16/16 or 1in (25mm). Sets commonly consist of #4-16 or #4-10 bits. Commonly referred to as a wood bit, it has a central point, and a couple of raised spurs to maintain the bit in a straight position while drilling. Oberg, Erik; Jones, Franklin D.; Horton, Holbrook L.; Ryffel, Henry H. (2000), Machinery's Handbook (26thed.), New York: Industrial Press Inc., ISBN 0-8311-2635-3. The most important thing to remember when drilling into plastic is how brittle the material can be when compared wood, concrete, or aluminum. Dremels are versatile tools that can perform many tasks, including sharpening your drill bits. You can think of one as a mini grinder. It can be used to sharpen drill bits such as twist, flat wood, and masonry bits, but a Dremel will probably struggle with more specialized bits.

High-speed steel: made from carbon steel with chromium and vanadium additives. It’s suitable for drilling wood, plastic and soft metals. Long series drill bits are unusually long twist drill bits. However, they are not the best tool for routinely drilling deep holes, as they require frequent withdrawal to clear the flutes of swarf and to prevent breakage of the bit. Instead, gun drill (through coolant drill) bits are preferred for deep hole drilling. The key to the sharpening process on the point is to keep it centered. Otherwise, you risk having the bit not spin in a uniform fashion. The result will be the size of the hole widens which creates the “wandering” issue. To keep it centered, try sharpening the bit on a drill press. The rotation will help you keep the point centered properly, so you can effectively sharpen all sides evenly. Can Brad Point Drill Bits be Used on Metal? Although it is claimed that the stepped drill was invented by Harry C. Oakes it was in fact conceived by George Godbold and first produced by Bradley Engineering, Wandsworth, London in the 1960s and named the Bradrad. It was marketed under this name until the patent was sold to Halls Ltd.uk by whom it is still produced.

About Lip and Spur Drill Bits

You may need to consult with your carpenter or home improvement consultant for the right sizes and specifications. Can you Use Brad Point Drill Bits for Plastic?

Todd, Robert H.; Allen, Dell K.; Alting, Leo (1994), Manufacturing Processes Reference Guide, Industrial Press Inc., pp.43–48, ISBN 0-8311-3049-0. For soft or medium-density plastics, it’s always nice to have a set of step drill bits like this, especially if you want to drill a heaps of different-size holes. A HSS drill bit is made from high-speed steel, as described in the materials section above. It’s often used in multi-purpose drill bits as it can be used on wood, plastic and metal. HSS drill bits are also the best drill bits for soft metals. Using an ordinary two-flute twist drill bit to enlarge the hole resulting from a casting core will not produce a clean result, the result will possibly be out of round, off center and generally of poor finish. The two fluted drill bit also has a tendency to grab on any protuberance (such as flash) which may occur in the product.Twist drill bits range in diameter from 0.002 to 3.5in (0.051 to 88.900mm) [9] and can be as long as 25.5in (650mm). [10] The pin is sharp and pointed at a 90 degrees angle. This ensures that the bit cuts when it meets the hardwood grains. This feature of brad point bits prevents walking and broken edges at the finish, something that is a bit different from regular twist bits. Brad points for softwood For the ultimate in durability and selection, look no further than these STEELEX PLUS High Speed Steel (HSS) Brad Point Bits. HSS assures that they will stay sharp far longer than ordinary carbon steel.

Manufacturers can produce special versions of the twist drill bit, varying the geometry and the materials used, to suit particular machinery and particular materials to be cut. Twist drill bits are available in the widest choice of tooling materials. However, even for industrial users, most holes are drilled with standard high-speed steel bits. Tungsten carbide: made from a mix of tungsten metal and carbon. It's even more hard-wearing than the standard carbide above. It is suitable for drilling into extremely tough materials such as masonry.The twist drill bit is the type produced in largest quantity today. It comprises a cutting point at the tip of a cylindrical shaft with helical flutes; the flutes act as an Archimedean screw and lift swarf out of the hole. Glass bits have a spade-shaped carbide point. They generate high temperatures and have a very short life. Holes are generally drilled at low speed with a succession of increasing bit sizes. Diamond drill bits can also be used to cut holes in glass, and last much longer. Most plastic drill bit sets come with around 5-10 different bits. This means you get different sizes to match the different-diameter holes you want to make, as well as spares in case you suddenly find that one of your tips has gone blunt.