Views:0 Author:Site Editor Publish Time: 2021-09-18 Origin:Site
A drill bit is a cutting tool used to remove material to create holes, almost always of the circular cross section. Drill bits come in many sizes and shapes and can create different kinds of holes in many different materials. Let's learn something about the drill bit.
This passage is going to talk about the followings of drill bit:
1) Introduction of drill bit
2) Features of drill bits
In order to make holes, drills are usually attached to the bit, which will provide them with the power to cut the workpiece, usually by rotating it. The upper end of the grasp point of the drill is called the collet of the shank.
Drill bits are available in standard sizes, as described in the Drill bit Sizes article. The comprehensive drill and tap sizes table lists the metric and imperial sizes of drills and the required tap sizes. There are also special drill bits for holes with non-circular cross-sections.
Although the term drill may refer to a drill or drill bit when used in a drilling machine, in this document, for clarity, drill or drill bit is always used to refer to a drill bit used in a drilling machine, and drill bit always refers to a drilling machine.
There are several characteristics of the drill geometry.
The spiral (or torsion rate) in the drill controls the chip removal rate. Fast spiral (high torsion rate or "compact flute") bits are used for high feed rate applications at low spindle speeds where large amounts of chips need to be removed. Low spiral (low torsion rate or "slim flute") bits are used for cutting applications where high cutting speeds are traditionally used and where the material tends to wear the bit or otherwise clog the hole, such as aluminum or copper.
The angle of the point, or the angle formed at the tip of the bit's edge, is determined by the bit that will be operated on the material in question. Harder materials require a larger point angle, and softer materials require a sharper angle. The correct tip angle for the hardness of the material affects drift, chatter, hole shape and wear rate.
Said lip angle determines the amount of support provided to said cutting edge. A larger lip angle will cause the drill to cut more aggressively at the same point pressure as a drill with a smaller lip angle. Both of these conditions can lead to tool seizure, wear and ultimately catastrophic failure. The proper size of the lip clearance is determined by the sharp angle. A very sharp point angle will provide more web surface area to the workpiece at any given time, thus requiring a large cutting-edge angle. Flat drills are extremely sensitive to small changes in cutting edge angle due to the small surface area supporting the cutting edge.
The functional length of the drill bit determines how deep the hole can be drilled, as well as the rigidity of the drill and the accuracy of the resulting hole. While longer bits can drill deeper holes, they are more flexible, which means they may drill holes that are inaccurately positioned or off the intended axis.
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