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The straight drilling tip at the center of the three-point product can stick into the wood like an awl.
Regularly, the wood flat drill bit comes with the outer diameter ranging from 6mm to 40mm, material of 45# steel and the hardness from HRC40 to HRC48. Carbon Steel- the is the most inexpensive and most common bit material, for wood and plastic drilling.
A clever specialty bit for metal drilling holes of different diameter without changing bits. This article explains the basics about drill bits, details about drill bit materials, and information about specific bit designs and applications. There's a drill bit designed for just about every thinkable target material and drilling need. Naturally, the large variety of application materials and hole types makes for huge variety of drill bits. Because there's so much crossover between applications, sizes, and materials, the tidiest way to approach the enormous tangle of drill bit variation is to categorize them by design. Masonry and other hammer drill bits are not discussed in this article, because they can be a complicated enough subject on their own.
With only a few exceptions, most drill bits share the same basic parts and terminology for those parts. Being familiar with drill bit parts and part names is important for accurate ordering and understanding how each bit design is manufactured for its specific job. These are the grooves in a drill bit that allow and direct the ejection of material as it leaves the hole being drilled. Bit sizes and measurements might be the area where drill bits see the most variation, but even so, most drill bits still have several measurements in common that are used to identify them. After knowing what bit design and other features are needed for an application, measurements like bit length and diameter are necessary to further match a bit to its job.
Some bit designs include measurements specific to that design that are also used for identification and compatibility matching. A given size and type of drill bit will often be available in several materials, another purchasing option to consider.
Drill bit materials offer users varying degrees of wear-resistant toughness, strength, lasting sharpness, and otherwise unavailable drilling options (like through hard metals).
The most important factor to consider when choosing a bit material is the application material. By mixing higher concentrations of cobalt into the steel alloy, cobalt steel bits improve upon high speed steel bits with a greater degree of hardness that can withstand high temperatures. The aggressiveness of bit, how fast it ejects material, its target material, and drilling speed are determined by things like how much twist is in the bit, its tip angle, and lip angle.

Specialty bits have more drastic design changes, and sometimes need a little extra information for purchasing.
Like other self-starting bits, forstners with a self-starting feature will come to a small point before the main body of the bit tip begins. Used mostly by plumbers and electricians, auger bits are made for boring long holes through wood.
Often, auger bits are needed to drill holes across framing studs for things like wiring, meaning that auger bits can also be very long. Most auger bits have a small tip at the end for self-feeding, accurate centering, and faster drilling. Developed by DeWALT, these metal drilling bits include a miniature split point bit at their end. The holes at the end of bell hanger bits are for pulling wires through recently drilled holes for installation. These are a specialty bit for making countersink holes, a preliminary hole that allows the head of a screw to sit profile or beneath the level of the material. The normal twist drill head would slide to other place easily when boring hole on flat processing surface.
The type with fine pitch thread is fit for hand drill to process the cork wood and wet wood.
We offer variety of products, including masonry drill bits, taps for screw thread, diamond saw blade, HSS tool bits, and much more.
Bit materials and designs cover drilling for aluminum, ceramics, cast iron, countersinking, glass, granite, metal, marble, plastics, porcelain, slate, steel alloy, tiles, wood, and more. But before discussing specifics, we'll start with some very basic information about drill bits in general. Shanks are almost always perfectly round, and sometimes include design features that reduce bit slippage in the chuck. Drill bit lips can be positioned in different places on the bit, depending on the bit design and application. A carbon steel bit may be able to cut through some metal materials, but this may also cause heavy wear on the bit.
Great for softer wood materials and plastics, these bits perform great when they're not overworked. This lengthens the life of the bit considerably, especially when used on metals and other hard materials.
This addition can make them three to five times longer lasting than HSS drill bits, and also helps keep the cutting edges of the bit sharp. Carbide is an extremely hard material, making these bits the hardest of them all and the most expensive.

The cutting edges of split point bits are sharpened a little more narrowly at the tip, and at a different angle. Because split point bits are designed for metal drilling, they are readily available in hard bit materials like cobalt steel and carbide. After the hole is started, the lips on the outside of the bit cut the hole from the outside in. Their flatter cutting edges span the length of the bit's diameter, planing wood out of the hole as it cuts. But, self-centering forstner bits are available, and are much more suited for handheld power drill use. Cutting edges are placed on the sides of the spade blade, and they also have a small point at the center of the bit to guide the drilling. This tip allows the bit to drill a preliminary starter hole in the metal material and continue through with the rest of the hole all in one action without bit changing.
A bell hanger feature can be added to several designs of drill bits just by adding a small hole in the bit near its tip. They cover medium size drilling needs that are bigger than those that auger bits handle and smaller than those in the jurisdiction of the larger forster bits. So, during the drilling process, a guide hole is often bored for positioning the drill head.
Generally, the common type three-point wood drill head is processed through rolling, while the high precision one is processed through milling. When using the product, the user needs to push the product hard to make it deep into the wood material. Overshooting can mean paying for expensive bits that aren't needed, while undershooting the issue can burn through bits in an equally expensive way. All in all, HSS bits last longer and can cut through harder materials, but excessive heat during use can damage them, as heat undoes the hardening effect of their tempering process.
The only disadvantage is an increase in brittleness, but when used correctly, these will outperform and outdistance other steel bits.
However, titanium coated bits cannot be sharpened without losing the benefit of their coating. When needed for stainless steel and other hard metals, no other bit can keep up in performance and durability. The twist bit is followed by a cone shaped bit that bores out an indention for the screw head.

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17.04.2013 | Author: admin

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